Dellner Bubenzer

A rail vehicle (100) braking system has a magnetic track brake controller (160) that receives a brake command (cmd<B>) and in response thereto sends a first control signal (M) to a magnetic track brake unit (170). As a result, an electrically operated drivetrain (171, 172) causes a magnetic track brake device (173) to move from an idle position (PI) to an engaged position (PE) in which the magnetic track brake device (173) either has a zero-distance to the rail (110) upon which the rail vehicle (100) travels, or has a non-zero distance thereto and a magnetic flux (F<M>) is produced through the magnetic track brake device (173) and the rail (110) so that an attractive force between the rail vehicle (100) and the rail (110) is increased.

A rail vehicle brake assembly (100) acts on a rotating member (110) via first and second friction members (121; 122) movable between a respective engaged position (P_ENG) in which the friction members (121; 122) contact the rotating member (110), and a respective disengaged position (P_DIS) in which the friction members (121; 122) are at an idle distance (d_IDL) from the rotating member (110). An actuator (120) obtains a control signal (CS) and in response thereto controls the friction members (121; 122) to attain the respective engaged position (P_ENG). An adjuster mechanism (130) controls the friction members (121; 122) such that they in the disengaged position (P_DIS) are positioned within a joint margin range (d_m) from the idle distance (d_IDL) notwithstanding any wear (w). The adjuster mechanism (130) has a probing arrangement (131) controlling the friction members (121; 122) such that an activated distance (d_a) separating them from one another in the engaged position (P_ENG) decreases according to a monotonic function as the first and second friction members (121; 122) are worn (w). The probing arrangement (131) sets the activated distance (d_a) by an interaction between a slidable member (133) and a fixed-position member (135) that interact with one another along a contact profile containing an angled segment (T).

A rail vehicle brake system includes a brake unit (200) that receives an electric brake-force signal (BF) designating a set force value (F_set). The brake unit (200) contains: pressing members (211, 212), a rotatable member mechanically linked a wheel of the rail vehicle, a gear assembly (220) that operates mechanically on the pressing members (211; 212) so as to move them towards or away from the rotatable member, an electric motor (230) that, in response to the electric brake-force signal (BF), acts on the gear assembly (220) to cause the gear assembly (220) to operate the pressing members (211; 212), a load-cell sensor (250) produces a sensor signal (F) representing the force applied by the pressing members (211, 212), and a locking mechanism that locks the pressing members (211; 212). The brake actuator (120) obtains the sensor signal (F). When the magnitude of the applied force matches the set force value (F_set), the brake actuator (120) controls the locking mechanism to lock the pressing members (211; 212). The locking mechanism is self-locking, included in and forms an integral part of the gear assembly (220).

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An electrically operated brake assembly (200) for a rail vehicle contains: a rotating member mechanically linked to a wheel axle of the rail vehicle, at least one friction member (221; 222) movable between an engaged position in which the at least one friction member (221; 222) contacts the rotating member, and a disengaged position in which the rotating member is freely rotatable without contacting the at least one friction member (221; 222), a gear assembly (220) arranged to operate mechanically on the at least one friction member (221; 222), an electric motor (230) controllable via a control signal (CS) and configured to cause the gear assembly (220) to operate on the at least one friction member 221; 222) to move between the engaged and disengaged positions, a force sensor (225) configured to produce a pressure signal (F) indicating a magnitude of a force at which the at least one friction member (221; 222) contacts the rotating member, an angular position sensor (237) configured to produce a pulse-count signal (PC) where each pulse count reflects a particular angular movement of an output shaft of the electric motor (230) and a controller (120) configured to obtain the pressure signal (F) and the pulse count signal (PC), and based thereon define a home position for the electric motor (230).

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