A linear actuator 10 for a braking system (e.g. electrohydraulic brake-by-wire system), comprises an electric motor 1 with a motor housing 1.1; a piston 4 with a piston housing 5; and a ball screw drive 2 including a spindle (2.2; figs. 2-4) and a nut 2.4. The ball screw drive converts rotational motion of the rotor tube (1.2; fig. 5) of the electric motor 1 into a linear translation of the piston 4. The spindle is rotationally and axially fixed to the motor housing 1.1, and the nut 2.4 is connected to the piston 4. The spindle may be fixed to the motor housing via a tolerance ring (2.1; figs. 2-4). The nut may include slots (12; fig. 4) for guiding the nut relative to ribs (13; fig. 6) in profile pipe (1.3; figs. 5-6), and/or may include a bump element (11; fig. 4) to stop movement of the nut in the backwards direction at the end of the stroke. The nut may include a plastic sleeve (2.5; fig. 4).
Linear actuator for braking systems and braking systems
2022-03-09
Patent
Electronic Resource
English