Patent ID: 6390247
Filing Date: 2002-05-21
Classification: F16D

Abstract:
A brake caliper comprising:a) an electric motor; b) a ball screw rotatably driven by said electric motor; c) a ball nut threadably engaged on said ball screw; d) a ball-nut housing attached to said ball nut; e) a first drive pin attached to said ball-nut housing and extending generally perpendicular to said ball screw; f) a first brake lever having an axis of rotation disposed generally parallel to said first drive pin and including a first groove, wherein said first drive pin extends into said first groove; g) an eccentric cam shaft having a cam portion, connected to said first brake lever, and having an axis of rotation disposed generally coincident with said axis of rotation of said first brake lever; h) a piston shaft assembly including an end slot and having a longitudinal axis disposed generally perpendicular to said axis of rotation of said eccentric cam shaft, wherein said cam portion is seated in said end slot, wherein said piston shaft assembly has a length and includes an adjustment screw having a threaded end for extending the length of said piston shaft assembly; i) a piston head attached to said piston shaft assembly; j) a brake-caliper housing including a rotor channel for receiving a rotor therein, wherein said rotor has a first surface for engagement with a first brake pad, wherein said first brake pad is attachable to said piston head, and wherein said electric motor rotates said ball screw which translates said ball nut, said ball-nut housing, and said first drive pin which rotates said first brake lever, said eccentric cam shaft, and said cam portion which translates said piston shaft assembly, said piston head, and said first brake pad; k) a second drive pin attached to said ball-nut housing and extending generally opposite to said first drive pin; l) a second brake lever having an axis of rotation disposed generally parallel to said second drive pin and including a second groove, wherein said second drive pin extends into said second groove, wherein said eccentric cam shaft is connected to said second brake lever, wherein said axis of rotation of said eccentric cam shaft is disposed generally coincident with said axis of rotation of said second brake lever, and wherein said cam portion is disposed between said first and second brake levers; and m) an adjustment lever having an axis of rotation disposed generally coincident with said axes of rotation of said first and second brake levers, wherein said adjustment lever is disposed between said cam portion and one of said first and second brake levers, wherein said eccentric cam shaft is connected to said adjustment lever, and wherein said adjustment screw of said piston shaft assembly is rotatable by rotation of said adjustment lever.