Brake assembly with telescopic multiple ball screw mechanism

A brake assembly comprising:

• a plurality of ball-screw mechanisms, each of the plurality of ball-screw mechanisms comprising:
• a rotatable part,
• a fixed part comprising an outer ball nut fixed to a housing,
• a rotatable and translatable part comprising an outer ball screw and an inner ball nut, wherein the outer ball screw is operably coupled with the outer ball nut of the fixed part through first rolling bodies, and the rotatable and translatable part comprising the outer ball screw and the inner ball nut is operably coupled with the rotatable part and is configured to be rotated relative to the outer ball nut and axially translated relative to the rotatable part and the outer ball nut of the fixed part simultaneously by rotation of the rotatable part, and
• a translatable part comprising an inner ball screw operably coupled with the inner ball nut of the rotatable and translatable part through second rolling bodies, the inner ball screw configured to be axially translated relative to the rotatable and translatable part comprising the outer ball screw and the inner ball nut by rotation of the inner ball nut to move a brake pad assembly;
• an actuator configured to rotate one rotatable part of one of the plurality of ball-screw mechanisms;
• an idler rotatably connecting between the one rotatable part of the one of the plurality of ball-screw mechanisms and an other rotatable part of an other of the plurality of ball-screw mechanisms, the idler configured to transmit rotation from the one rotatable part of the one of the plurality of ball-screw mechanisms to the other rotatable part of the other of the plurality of ball-screw mechanisms;
• and
• a brake pad assembly, wherein each translatable part of each of the plurality of ball-screw mechanisms is operably connected to the brake pad assembly, and the brake pad assembly is configured to be movable relative to a rotor in response to axial translation of each translatable part of each of the plurality of ball-screw mechanisms.