Abstract: Disclosed is a brake actuating apparatus which can perform braking without converting a rotational motion into a linear motion. The brake actuating apparatus includes a caliper body with a cylinder. An electric motor is fixed to the caliper body. A pressing piston is installed in the cylinder. A housing or plug is installed in and block the cylinder, and a rotational shaft is installed at the center of the housing to be rotated by the motor. A head is attached to the rotational shaft and defines a fluid-receiving space in cooperation with the housing. The rotation of head varies the volume of space, thereby moving the pressing piston.

Abstract: The present invention relates to an electrically driven brake booster in which boost control is performed as follows; when an input piston is displaced forward by an input rod upon an operation of a brake pedal, an electric motor is operated according to the input, and a primary piston is displaced forward by a ball-screw mechanism, and then a primary and secondary pressure chamber in a master cylinder main body are pressurized. A first seal and a second seal are disposed at a seal portion between the primary piston and the input piston. A portion between the first seal and the second seal is in communication with an outside through a discharge passage. Brake fluid which leaks from the first seal is sealed off by the second seal, and is discharged to the outside through the discharge passage, whereby it becomes possible to prevent that the electric motor and the ball-screw mechanism otherwise might be corroded by the leaking brake fluid.

Abstract: A force sensor includes a shaft to which a magnet is fixed, and a case which can reciprocate with respect to the shaft and to which a Hall IC element is fixed. The Hall IC element outputs an output voltage which changes in accordance with relative displacement between the Hall IC element and the magnet. A main spring is interposed between the shaft and the case and elastically deforms in accordance with force produced between the shaft and the case in the reciprocating direction. A sub spring is provided in order to impart a preload such that when the amount of elastic deformation of the main spring is substantially zero, no axial clearance is formed between a flange portion of the shaft and one end portion of the main spring, and no axial clearance is formed between the case and the other end of the main spring.

Abstract: A method for actuating an electromechanical parking brake device for a brake that can be actuated by an electromechanical actuator comprised of an electric motor and of a reduction gear connected downstream of the electric motor and provided for converting a rotational motion into a translatory motion. In order to guarantee that the electromechanical parking brake device works reliably in all operating states without using a tension force sensor, the method determines and stores, during the actuation of a parking brake device, a mean value of the torque of the electric motor necessary for generating the application force of the brake corresponding to the parking brake actuation and simultaneously determines the actuator position and actuates the electric motor at later points of time in such a way that it generates this torque multiplied by a correction factor k?=>1 so that the exerted tension force is maintained or increased.

Abstract: An electric braking apparatus including a motor for pressing brake pads on disks, a metal housing for housing the motor, a positive-polarity power line for transmitting power from a battery to the electric motor, a negative-polarity ground line for connecting the electric motor to the ground of a vehicle, and a conductor for electrically connecting the metal housing to the negative polarity of battery or the negative-polarity of an inverter.

Abstract: A disc brake, particularly for utility vehicles, comprising a brake caliper that overlaps a brake disc, a tensioning device for tensioning brake pads, and an adjusting system for compensating for wear to the brake pads and/or brake disc. The adjusting system has at least one electric motor that serves as a drive. The at least one electric motor is mounted on the brake caliper in a manner that permits it to be accessed from the exterior.

Abstract: A gear mechanism for a brake system can be coupled on the inlet side to an actuating drive of the brake system via a drive shaft which can be driven rotationally by the actuating drive. The gear mechanism can be coupled on the output side to a brake unit of the brake system via an output shaft. The brake unit has at least one brake. The gear mechanism has a first and a second gear train having different transmission ratios. Furthermore, the gear mechanism is configured in such a way that, in order to apply the brake, only the first gear train and, in order to release the brake, only the second gear train of the gear mechanism transmits a drive torque of the actuating drive to the output shaft. The transmission ratio of the second gear train is greater than the transmission ratio of the first gear train.

Abstract: In the specification and drawings, an apparatus and method for operating a take-up mechanism is described and shown. The take-up mechanism includes a gear, a motor configured for engagement with the gear, and a manual input shaft configured for engagement with the gear. In a first mode of operation, the gear transmits rotation from the motor, and in a second mode of operation, the gear transmits rotation from the manual input shaft. In an alternate embodiment, the take-up mechanism may include a plate between the manual input shaft and the gear. The plate may be configured to transfer rotation and torque from the manual input shaft to the gear, or inhibit the transfer of rotation and torque from the gear to the manual input shaft. The method for operating the take-up mechanism uses a motor and a manual input shaft connected to a gear to operate the take-up mechanism in the first and second modes.

Abstract: The invention provides an electromechanical actuator for a vehicle brake, the actuator comprising: a motor; a screw-and-nut system having a first element, the screw or the nut, rotated by the motor; and an antirotation member preventing rotation of the second element of the screw-and-nut system, the nut or the screw, so that the second element moves linearly in response rotation of the motor so as to exert compression selectively on friction elements of the brake. According to the invention, the actuator is subdivided into a first portion comprising the screw-and-nut system, and a second portion comprising the motor, the portions being designed to be separable while the actuator is mounted on a brake.

Abstract: There is provided an electromechanical actuator for a parking brake system of a vehicle, including an electric motor, reduction gear train associated with the motor for transmitting motion from the motor to a single power transmission chain sprocket, one power transmission chain section drivable by the sprocket partly encircling one sheave, rotatably mounted on a free longitudinally movable pulley block, an end of the power transmission chain being attached to a first stationary anchor point, and a connector connecting the pulley block to the vehicle's parking brake system.

Abstract: A plurality of fan blades are secured to a rotor assembly of a single directional motor. When the motor is powered on, a force generated by the fan blades pushes the rotor assembly in a direction of a low friction thrust interface. When the motor is backdriven in a direction opposite the powered direction, the force generated by the fan blades pushes the rotor assembly in a direction of a higher-friction thrust interface, causing a tapered surface of the pinion and a tapered surface of a bearing retainer to be pressed against each other to produce a frictional braking force. The backdriven speed of the motor and drive device is therefore reduced, improving the reliability of the motor assembly. The invention can be applied to motor actuators used to control air dampers and other valves in gas or fluid delivery systems. The invention can also be used to reduce water hammer in water delivery systems.

Abstract: An operating mechanism (1) for a parking brake, particularly for motor vehicles, arranged in a housing (60) comprising a threaded rod (20) driven by a motor (10) having a first brake cable fixing (30) guided on said threaded rod (20) for the transformation of said rotation of said motor (10) in a linear movement of said first brake cable fixing (30); and a second brake cable fixing (40) in axial arrangement with said first brake cable fixing (30) and said motor (10) for executing a relative movement of said first (30) and said second brake cable fixing (40) to each other whereby said first (30) and said second brake cable fixing ( 40) can carry out a common relative movement with respect to the housing (60) for a uniform load distribution to the connected brake cables (70).

Abstract: In a vehicle brake having a brake piston accommodated in a housing, a blocking device for securing the brake piston inside the housing and an actuating device for controlling the blocking device, it is provided that the brake piston together with the housing delimits a fluid chamber, which is chargeable with hydraulic fluid, so that the brake piston for actuating the vehicle brake is displaceable hydraulically inside the housing along a piston longitudinal axis, that moreover the blocking device comprises a ramp arrangement and a blocking element that is displaceable relative to the housing, and that by means of the actuating device the blocking element in interaction with the ramp arrangement for securing the brake piston inside the housing is displaceable and connectable to the brake piston.

Abstract: The present invention discloses and claims an apparatus and method for operating a take-up mechanism. The system includes electric and manual actuating mechanisms engaged with a combiner mechanism to apply force to the take-up mechanism. In a first mode of operation, the combiner mechanism transmits rotation from the electric actuating mechanism, and in a second mode of operation, the combiner mechanism transmits rotation from the manual actuating mechanism. The method for operating the take-up mechanism uses a motor and a manual input shaft connected to a gear to operate the take-up mechanism in the first and second modes. The motor is engaged with the gear during at least the second mode of operation.

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: In an electric parking brake system, the moving force-based target tension is set based on the inclination angle of a vehicle and the shift position, and the slack compensation amount is determined based on the inclination angle of the vehicle and the shift position. The control target tension is set to a smaller value from among the slack-based target tension, which is the sum of the moving force-based target tension and the slack compensation amount, and the maximum value of the output power that can be produced by an electric motor. The electric motor is controlled such that the tension of the cable matches the control target tension (the slack-based target tension, in most cases).

Abstract: An electric parking brake system is provided with a brake that includes a rotating body which has a friction face and which rotates together with a wheel, a friction member which is fitted to a non-rotating body so as to be movable relative to the non-rotating body, and a pushing mechanism that pushes the friction member against the friction face or the rotating body. In the brake, the friction member pushing force that is the force with which the friction member is pushed against the friction face is controlled based on the temperature of an inclination angle sensor that detects the inclination angle of the vehicle in the longitudinal direction of the vehicle, the temperature characteristics of the inclination angle sensor, and the detection value from the inclination angle sensor.

Abstract: In an electric parking brake system including a tension control unit that controls the friction member pushing force in a brake by controlling the tension of a cable, the target tension is set to a larger value when a vehicle is maintained at a standstill on a downhill slope than when the vehicle is maintained at a standstill on an uphill slope.

Abstract: In an electric parking brake system, a first position (Park) is tentatively determined and also finally determined before the initial check is completed. Even when a second position is tentatively determined before the initial check is completed, the second position is finally determined after the initial check is completed. Then, a determination that the shift position has been changed is made. When a release command is issued based on the determination that the shift position has been changed, an electric motor is operated to release parking brakes.

Abstract: An actuating unit for an electromechanically actuatable disk brake for motor vehicles consists essentially of a drive unit (1), i.e., an electric motor (11); an actuating element (7), by means of which one (4) of two friction linings (4, 5) mounted with limited freedom of movement in a brake caliper can be brought into engagement with a brake disk (6); and a first and a second reducing gear (2, 3). An electronic controller (8), which serves to drive the electric motor (11), is assigned to the actuating unit. To realize an actuating unit of compact axial dimensions which is also optimally designed with respect to packaging, at least part of the electronic controller (8) is mounted between the electric motor (11) and the housing (25) which holds the second reducing gear (3).

Abstract: In a vehicle brake comprising a housing, a brake piston, which is accommodated in the housing and on which a brake lining is fitted, and a blocking device, it is provided that the brake piston is displaceable in the housing by means of an actuating device and that the brake piston is securable relative to the housing by means of the blocking device. In this vehicle brake, it is further provided that the blocking device comprises an electromechanical latching arrangement, which is actuable in such a way that in a latching position it prevents a displacement of the brake piston inside the housing and in a release position it enables a movement of the brake piston in the housing.

Abstract: An electric parking brake includes an actuating device, which provides a force to lock and unlock the parking brake using power supplied by manipulation of a control button, and an equalizer, which is coupled at a first end thereof to the actuating device and is coupled at a second end thereof to a parking cable to pull or release the parking cable, which operates a braking device of a wheel, depending on operation of the actuating device. The electric parking brake further includes an operating load measuring unit, which measures operating load that pulls the equalizer in the parking cable and sends the measured signal to an ECU that controls the actuating device.

Abstract: An electromechanically actuatable self-boosting disk brake in which a friction brake lining is guided displaceably with a guide whose angle to the brake disk is adjustable via an electric motor to attain brake reinforcement. The angle of the guide is adjusted independently of an actuating device with which the friction brake lining is pressed against the brake disk.

Abstract: An object of the present invention is to provide an electric disc brake apparatus having a simple constitution in which the operating condition of a parking brake can be reliably detected. A controller detects the operating condition (steps S25, S26) of a solenoid for driving a parking brake locking mechanism (holding mechanism) by means of a motor current (step S24). As a result, a state in which thrust generated by the motor (first electric actuator) is maintained by the parking brake locking mechanism, and accordingly the operative and inoperative states of the parking brake can be understood easily. Further, detection of the motor current is performed using a current sensor that is also used to realize a function of the motor (a function for moving brake pads toward a disc rotor), and hence separate current detection means need not be provided.

Abstract: A relay switch for selectively connecting a power supply line of an inverter to a ground line is inserted between the inverter and a power source, and a power consumption unit such as a resistor element is inserted between the relay switch and ground line.

Abstract: An electric disk brake that can be operated and inspected before being assembled and that can be assembled easily. A piston, a ball ramp mechanism, a differential reduction mechanism, and a pad wear compensation mechanism are integrated to form a piston unit. A motor, a resolver, and a drive controller are integrated to form a motor/controller unit. The piston unit is inserted into a cylinder of a caliper body, and the motor/controller unit is mounted on the caliper body to assemble an electric caliper. Before being incorporated into the electric caliper, the motor/controller unit can be operated and easily inspected for any defect by applying an electric current to the motor/controller unit.

Abstract: A speed reducer 32 has an eccentric rotating member 56 which rotates along with a motor shaft 55 of an electric motor 11, an outer gear 57 which is rotatably supported by the outer circumference of the eccentric rotating member 56, an inner gear 58 which is fixedly disposed so as to be coaxial with the motor shaft 55 so as to engage with the outer gear 57, an output member 59 which is connected to an input member 37 of the motion converting mechanism 22 disposed so as to be coaxial with the motor shaft 55 so as to be not relatively rotatable about the input member 37, and an Oldham mechanism 60 which is disposed between the outer gear 57 and the output member 59 so as to transmit only a rotational component of the outer gear 57.

Abstract: A relay switch for selectively connecting a power supply line of an inverter to a ground line is inserted between the inverter and a power source, and a power consumption unit such as a resistor element is inserted between the relay switch and ground line.

Abstract: When a driver operates an activation switch, an electric parking brake apparatus performs a parking brake activation control in order to operate an electric motor until the tension of a base wire reaches a predetermined target tension to thereby bring parking brakes into an activated state. After that, the apparatus again performs the parking brake activation control when a re-activation time, which is set in accordance with the difference between an estimated temperature of a service brake and an ambient temperature, has elapsed; when the position of a shift lever has been changed; when the height of the vehicle has changed by an amount greater than a predetermined amount; or when the driver releases a brake pedal which has been continuously operated after completion of the parking brake activation control.

Abstract: An actuator, preferably a linear actuator for furniture, comprises a brake spring (20) in the form of a helical spring having a plurality of windings wound around a cylindrical element (10) of plastics rotatable at least during braking, said spring being tightened around the cylindrical element for braking. The frictional heat generated hereby can cause the plastics to be deformed, which adversely affects the braking power. This is solved by providing the cylindrical element (10) consisting of plastics with an insert (12) of metal for carrying off the frictional heat preferably into other metal parts of the actuator that may serve as cooling faces. To carry off heat additionally, it is proposed to arrange a second heat-conducting element (18) in intimate contact with the outer side of the spring (20), said element being likewise connected with other metal parts of the actuator that may serve as cooling faces.

Abstract: An apparatus engageable with a hand brake assembly for automatically applying at least one brake device secured to a railway vehicle with such hand brake assembly. The apparatus includes an operating mechanism having at least a portion thereof engageable with at least one gear of a gear assembly disposed in a housing member of the hand brake assembly for operating such gear assembly in a direction which will cause an application of such brake device. A source of fluid pressure is connected to the operating mechanism for periodically supplying a predetermined pressure to such operating mechanism for the application of the brake device. An activating device is connected to the source of fluid pressure for initiating the supply of such predetermined pressure to the operating mechanism thereby causing an automatic application of such brake device by the hand brake assembly.

Abstract: The present invention relates to a manual brake release mechanism for an electromagnetic brake of an electronic motor. The manual brake release mechanism includes a cam and lever assembly operable to move an armature plate away from a friction disk, thereby, disengaging an electromagnetic brake. The cam and lever assembly is coupled to a field cup and provides an even pull over both sides of the armature plate.

Abstract: A disc brake for a heavy road vehicle has a caliper arranged at a brake disc mounted on a wheel axle of the vehicle. An electric motor and two thrust rods operationally connected thereto are provided in the caliper. The thrust rods transform a rotational ingoing movement from the motor into a linear outgoing movement for transmission to a disc brake pad, intended for braking engagement with the brake disc.

Abstract: An electric parking brake system includes motors, parking brakes, current a detection portion, a drive circuit, and a controller. The parking brakes are driven by the motors to apply braking force to wheels. The current detection portion detects the amount of current supplied to the motors. The drive circuit supplies a constant predetermined voltage to the motors. The controller controls supply of electricity to the motors. The drive circuit is controlled by the controller. When a detected current value exceeds a predetermined value, the controller stop supplying electricity to the motors.

Abstract: A reluctance force brake device applies the coupling and combining concept of the reluctance braking unit to the original rotating source or say mechanical rotation axle for kinetic energy output. The reluctance braking unit, utilizing electrical energy from forward electrical energy source or brake reverse recover energy, generates the reverse reluctance force to reduce the speed of rotating source to operate brake action. The driving design can be extended to absorb the brake reverse recovery energy for recycling in motives related applications, which can help to upgrade or replace the bake system of traditional mechanical vehicles or electrical vehicles, and improve the applicability for drive-by-wire development trend.

Abstract: An electromechanically actuated disk brake with mechanical self-boosting includes an automatic wear readjusting device, which can for instance have a positive-engagement detent device. An increased air clearance caused by wear of friction brake linings is prevented by the invention, which thus also prevents an increase in the displacement of the friction brake lining in the direction of rotation of the brake disk when the disk brake is actuated in order to attain the self-boosting.

Abstract: An electrically actuated parking brake system and actuator therefor. The actuator includes a motor having a drive shaft, and a gear train coupled to the drive shaft, wherein the gear train provides at least one mechanical output from the actuator. The gear train may include a drive gear coupled to the drive shaft, a driven gear coupled to the drive gear, and a planetary gear set coupled to the driven gear. Various configurations are provided for isolating actuator components for controlling audible noise, including sub-frame isolation configurations, motor isolation configurations, and gear train isolation configurations.

Abstract: An actuating assembly for an electronic parking brake includes a housing and motor secured to the housing and having an output shaft. A cable assembly is rotatably driven by the motor. A cable is anchored at a first end to the cable assembly and wraps around the cable assembly as the cable assembly rotates in a first direction. A first spring is secured to the cable assembly such that it is rotatable with the cable assembly. A drum receives the first spring, which is engageable with an interior surface of the drum to prevent rotation of the cable assembly. A plurality of grooves is formed on a surface of the drum. At least one roller element is positioned in a groove of the drum. A spring housing receives the drum and is secured to the housing. Each of a plurality of apertures in the spring housing receives a roller element.

Abstract: A screw actuator comprises a housing (1), a screw mechanism (4) with a nut (6) and a screw (5), as well as a motor (7) which is drivingly connected to the screw. The screw (6) is rotatably and translatably supported with respect to the nut (5), which is fixed with respect to the housing (1). The screw engages a translatable, non rotatable actuating head (29) through a swivel connection. The swivel connection comprises a pair of conformed surfaces (41, 42) having a common rotational axis of symmetry which is aligned with the axis of the screw mechanism.

Abstract: To provide an electrically powered brake system capable of performing a control of the braking force appropriate to a particular wheel rotational speed with high response and capable of being simplified in structure with no need to employ any hydraulic equipment and the related pipe lines, the electrically powered brake system includes an actuating unit 18 including a brake wheel 16 mounted on a vehicle wheel 1 and brake pieces 17 frictionally engageable with the brake wheel 16. A drive unit 19 is operable to translate a rotary output of an electric drive motor 20 into a rectilinear reciprocating motion by means of a ball screw mechanism 23, which rectilinear reciprocating motion is transmitted to the brake pieces 17 as a braking force. An operating unit 32 is operable to control the electric drive motor 20 according to manipulation of an operating member 31 such as, for example, a brake pedal.

Abstract: A disc brake assembly has a hub that is rotatable about an axis and at least a pair of discs supported on the hub for relative axial movement along the axis of the hub with the discs having opposite sides presenting braking surfaces. A non-rotatable support structure supports a plurality of friction elements for relative axial movement into and out of frictional braking engagement with the braking surfaces of the discs. An electric actuator is mounted on the support structure adjacent at least one of the friction elements and is operative when actuated to move the friction elements into frictional braking engagement with the braking surfaces of the discs.

Abstract: A braking force is generated by using a rotation of an electric motor to move a piston, which presses friction members onto a rotor. The displacement of the piston is controlled such that a detection value of a resolver becomes a target value. In the case of brake noise due to vibration of the rotor, the displacement of the friction members with respect to the rotor fluctuates in connection with the rotation of the rotor, leading to fluctuations in a rotational amount of the electric motor. Therefore, in a simple method and apparatus, brake noise can be detected based upon the magnitude of the fluctuation amount in the detection value of the resolver.

Abstract: The invention relates to a friction brake (10) for a motor vehicle. The friction brake (10) for instance has a disk brake (12), which is actuatable by means of an actuating device, for instance in the form of a ball thread drive (22). The invention proposes embodying the friction brake (10) with a band brake (34), whose band (36) is mounted on the circumference of a nut (26) of the ball thread drive (22). If the brake band (36) is put under tensile stress in order to actuate the band brake (34), then the brake band (36) rotates the nut (26) of the ball thread drive (22) in a tensing direction and in this way actuates the disk brake (12). The invention has the advantage that the friction brake (10) has high brake boosting and therefore requires only little actuating energy. It is accordingly suitable for embodiment as an electromechanical friction brake (10) with an electric motor (56) for its actuation.

Abstract: An electrically powered actuator mechanism for operating a vehicle parking brake including a reversible electrical motor having output gearing driving a sector gear. A wrapped spring clutch drivingly connects the sector gear to an intermediate operator cable wind up wheel. The intermediate cable is connected to the brake cable to set the brakes when the operator cable is wound up by energization of the motor in one direction, with a load sensor turning off the motor when a predetermined tension load is reached. Locking motor gearing holds the brake in the set condition. Reversal of the motor unwinds the cable to release the parking brake. A self adjusting feature is provided by a pretensioned clock spring creating a torsional bias on the wind up wheel tending to maintain a predetermined tension in the brake cable. A spring clutch is released by engagement of a release arm to allow the clock spring to adjust the wind up wheel.

Abstract: A locking mechanism for a disc brake that retains a clamping force that holds first and second friction members into engagement with a rotor to sustain a brake application. The locking mechanism is characterized by a first threaded member integrally attached to a piston located in a bore. The piston is moved within the bore to establish a clamping force and is prevented from rotating with respect to the bore by means of anti rotation members associated with the piston. A second threaded member rotates on the first threaded member with movement of the piston. A third member is moved into contact with the second threaded member to prevent rotation of the second threaded member and retaining clamping force on the friction members to affect a parking brake application.

Abstract: The brake control apparatus sets a target deceleration (1) in accordance with an amount of operation of the brake pedal. It calculates another target deceleration (2) on the basis of the target deceleration (1). In this calculation, limit values of deceleration increasing and decreasing gradients with respect to the target deceleration (1) are set on the basis of the target deceleration (1), and then the target deceleration (2) is obtained by correcting the target deceleration (1) on the basis of the established deceleration increasing and decreasing gradients. Accordingly, the deceleration increasing/decreasing gradient becomes small when braking is gentle. This makes it possible to curb an abrupt change in brake force to achieve smooth brake control. Further, the deceleration increasing/decreasing gradient becomes larger when braking is abrupt. Accordingly, it is possible to create a great change in brake force to provide a high response.

Abstract: A motor-driven disk brake having a caliper containing a piston for pressing a brake pad, a rotary actuator and a rotary-to-rectilinear motion converting mechanism for transmitting rotation of the rotary actuator to the piston after converting it into rectilinear motion. The piston is driven in response to rotation of the rotary actuator to press the brake pad against a disk rotor, thereby generating braking force. A brake releasing mechanism for returning the rotary-to-rectilinear motion converting mechanism to its initial position in the event of a failure in the rotary actuator is interposed between a rotating member and a rectilinearly moving member that constitute the rotary-to-rectilinear motion converting mechanism. The brake releasing mechanism has an urging device for generating a torque in the direction for returning the piston in response to the rotation of the rotating member in the direction for advancing the piston.

Abstract: A method for detecting a contact point of a brake mechanism. The brake mechanism includes an actuator controlled by a motor. The method includes the steps of establishing a parameter of the motor and a derivative of the parameter and, if the parameter has passed a previous value under no load conditions and the amplitude of the derivative of the parameter has passed a predetermined threshold, responsively establishing a zero position of the motor.

Abstract: A hand brake system (40) for a rail vehicle providing a hand brake position alarm (76) before a train is moved with a hand brake not fully released. A switch (56) detects the position of a hand brake drive chain (18) to provide a brake engaged signal (60). The weight of the drive chain is supported through a load path that bypasses the switch. A master controller reverser handle position detector (74) provides a reverser handle position signal (72) when the reverser handle is moved out of neutral in preparation for providing power to the locomotive drive motors (15). A relay (70) is used to actuate the multiunit wheel slip indicator (54) and the general alarm bell (52) in every locomotive of the train consist when the brake engaged signal is coincident with the master controller reverser handle position signal. This combination of alarms, which normally indicates a locked axle when the train is above a predetermined speed, is interpreted as a hand brake position alarm when the train is at rest.

Abstract: An electromechanical wheel brake device has a helical gear for converting the rotating motion of an electric motor into a translating motion of a brake piston in order to press a brake pad against a brake disc in an advancing stroke or in order to release the brake pad in a restoring stroke. In addition, a clutch is provided, which operatively disengages a part of the helical gear from the electric motor should a permissible restoring stroke be exceeded. This prevents a mechanical failure or damage to the wheel brake device in the event of such a malfunction. The electromechanical wheel brake device can be used in motor vehicles such as cars.