| 摘要 |
ELECTRICALLY ACTUATED DISC BRAKE The electrically actuated disc brake (10) comprises a caliper (12) having a bore (16) receiving therein an actuating mechanism (90), and an electric motor (40)attached to the caliper housing (12). The actuating mechanism (90) comprises a planetary gear mechanism (50) which includes a sun gear (52), planetary gears (54), and a pair of ring gears (70, 80). An actuator sleeve (68) is disposed about the ring gears (70, 80) and contains a helical groove (69) disposed opposite a complementary-shaped helical groove (89) in a rotatable ring gear (80). The helical grooves (69, 89) receive therebetween a bearing mechanism (85) biased by a spring (87) toward a fixed stop (86) located within the helical grooves (69, 89). Operation of the electric motor (40) effects rotation of the rotatable ring gear (80) and axial displacement of the actuator sleeve (68) into engagement with a thrust pad (96) located adjacent one of the friction elements (18) so that the caliper (12), by reaction, displaces the other friction element (20) into engagement with the rotor (22). |
