Patent ID: 8365874

Claim:
An electric parking brake actuator comprising: an actuator device; a brake device connected with the actuator device and having a cable mounted through the actuator device; and a tube assembly mounted around the cable, located outside the actuator device, mounted securely on the actuator device and having a first tube; and a second tube composed of two separate segments including a first segment having two ends; and a second segment having two ends; and a cable-tension measuring device connected with the tube assembly and having a tubular first member mounted around the cable, wherein the two ends of the first segment of the second tube respectively mounted securely on the actuator device and the first member, the first member having an end surface; an outer surface, a through hole axially formed through the first member and having a wide section having a diameter and securely inserted into by a corresponding end of the first segment; and a narrow section having a diameter smaller than that of the wide section; and a round rim radially protruding from the outer surface of the first member and aligning with the end surface of the first member; a holding section being elongated along a line parallel to an axis of the first member, having an arcuated cross section and radially protruding from the rim; and a magnet recess formed in the holding section and having an opening; a second member mounted around the cable, facing the first member and capable of moving toward the first member relatively, wherein one of the ends of the second segment securely mounted on the second member and the other one of the ends of the second segment being fixed, the second member having a tubular tube bracket having an outer surface; two ends; a tube recess axially formed in one of the ends of the tube bracket, mounted securely around a corresponding end of the second segment and having a diameter and a bottom; a spring recess axially formed in the other one of the ends of the tube bracket, mounted around the rim and having a bottom and a diameter; a bracket hole axially formed through the bottoms of the spring recess and the tube recess and having a diameter smaller than that of the tube recess and that of the spring recess; and a hollow hoop mounted around the first member beside the rim and the end of the tube bracket which is adjacent to the spring recess; and an IC seat mounted securely on the outer surface of the tube bracket; a compressible spring mounted between the first member and the second member, facing the opening of the magnet recess, mounted in the spring recess, adjacent to the narrow section and having two ends respectively abutting the bottom of the spring recess and the end surface of the first member; a Hall IC mounted securely on the IC seat; and a magnet mounted securely in the magnet recess.