Electromechanical brake actuator for electromechanical brake arrangement

Electromechanical brake actuator (100, 200, 300), comprising:

• a service-brake unit (102) including:
• a service-brake rod (104), for applying a variable braking force (F) to an external caliper (502);
• a service-actuation unit (106) that receives receive a service-brake signal (SS) and, in dependence thereof, moves the service-brake rod (104) to a position (P) between a full braking position (BP), at which a maximum braking force (Fmax) is applied to the caliper (502), and a drive position (DP), at which no braking force (F) is applied to the caliper (502);
• wherein the electromechanical brake actuator (100, 200, 300) further comprises:
• a parking-brake unit (110), including:
• a parking-brake rod (112) operatively coupled to the service-brake rod (104) and movable between a first position (P1), in which the parking-brake rod (112) is arranged to lock the service-brake rod (104) in a braking position (BP), and a second position (P2) in which the service-brake rod (104) is released from the braking position (BP) and free to be moved by the service-actuation unit (106);
• and
• a parking-actuation unit (114) comprising a spring element (116) operatively coupled to the parking-brake rod (112) and arranged so that in a fully-compressed state (CS) of the spring element (116) the parking-brake rod (112) is in the second position (P2), and in a fully-released state (RS) of the spring element (116) the parking-brake rod (112) is in the first position (P1),
• the parking-actuation unit (114) further comprising a hydraulic unit (118) that is operatively coupled to the parking-brake rod (112) and that receives a parking-brake signal (PS) and, in dependence thereof, locks the parking-brake rod (112) at a given position, and further allows a release of the spring element (116) to the fully-released state (RS).