Patent ID: 6533079
Filing Date: 2003-03-18
Classification: F16D

Abstract:
A disc brake assembly (10) having a support member (12) secured to a vehicle, a caliper (16) having an actuation section (18) connected by a bridge (22) to an arm (20), said actuation section (18) having an actuation bore (24) therein for retaining a piston (26) to define an actuation chamber (28), a first friction member (30) is connected to said piston (26) while a second friction member (32) is connected to said arm (20), said caliper (16) having a first ear (38) and a second ear (44) extending from said actuation section (18), said first ear (38) receiving a head section (104) of a first guide pin (36) located in a first bore (40) and said second ear (44) receiving a second guide pin (42) located in a second bore (46) of said support member (12) to define first and second bearing surfaces that align said caliper (16) over a rotor (34) associated with a wheel of the vehicle, said actuation chamber (28) being presented with pressurized fluid from a source that acts on said piston (26) to develop an actuation force for moving said piston (26) and first friction member (30) toward said rotor (34) and on said actuation section (18) that causes said caliper (12) to slide on said first (36) and second (42) guide pins and move said second friction member (32) toward said rotor (34) to effect a brake application, said first (36) and second (42) guide pins each being characterized by a first cylindrical body (102,202) with a first head (104,204) thereon, a second cylindrical body (112,212) with a second head (114,214) on a first end and a threaded section (116,216) that extends from a shoulder (120,220) to a second end and resilient means (110,210) located between said second head (114,214) and one of said ears (38,44) on said actuation section (18), said threaded section (116,216) on said second end engaging said first head (104,214) to bring said shoulder (120,220) into engagement with said first head (104,204) to secure said second cylindrical body (112,212) with said first cylindrical body (102,202) while compressing said resilient means (110,210) between said second head (114,214) and said one of said ears (38,44) to urge said first head (104,204) into engagement with said one of said ears (38,44) and said second head (114,214) away from said one of said ears (38,44) such that said actuation force must first overcome a spring force of said resilient means (110,210) to move said first head (104,204) out of engagement with said one of said ears (38,44) before sliding movement of said caliper (16) occurs to effect said brake application and in that said spring force urges said first head (104,204) into engagement with said one of said ears (38,44) and correspondingly said second friction member (34) away from engagement with said rotor (34) to a rest position on termination of the presented pressurized fluid from said source.