Patent ID: 6435322
Filing Date: 2002-08-20
Classification: F16D

Abstract:
A duo two leading type drum brake device, comprising:a back plate; a pair of service brake actuators; a pair of brake shoes that face each other on said back plate and have a service brake actuator of said pair of service brake actuators between each pair of adjacent ends of said pair of brake shoes; an automatic shoe clearance adjustment device, which extends itself in response to an excessive opening of each of said first and second brake shoes upon operation of a service brake and automatically adjusts a clearance between a brake drum and each of said first and second brake shoes, that is provided in each service brake actuator of said pair of service brake actuators; wherein a pivot lever that is rotatably supported longitudinally at a central region of a first brake shoe of said pair of brake shoes; a first strut is provided between a first end of said pivot lever and a second brake shoe of said pair of brake shoes: a second strut parallel to said first strut is provided between a second end of said pivot lever and said second brake shoe; a parking brake actuator comprising of a brake lever and positioned so as to activate a link mechanism that includes said pivot lever and said first and second struts, upon operation of a parking brake, spread open said pair of brake shoes through an engagement with said link mechanism; and an automatic parking stroke adjustment device, which extends in response to an excessive opening of both of said first and second brake shoes and automatically adjusts a stroke amount of said parking brake actuator, is provided on at least one of said first and second struts.