Drum brake device having a shoe clearance over-adjustment prevention apparatus

摘要

A shoe clearance over-adjustment prevention apparatus employable to various types of automatic shoe clearance adjustment devices and drum brakes and designable to have a common thermo-sensitive member suitable for mass production. The thermo-sensitive member 60 is sandwiched between the strut 20 and the brake lever 30 to cause a functional engagement, and if the brake temperature reaches a predetermined value or range, the strut 20 is pushed toward the brake shoe 12 so as to disable the automatic shoe clearance adjustment operation.