Arrangement for automatic adjustment of braking gaps in drum brakes

摘要

An arrangement for automatic adjustment of a braking gap in a drum brake of the type in which a pair of brake shoes is expanded (moved away from each other) into engagement with the inside face of a brake drum. A brake lever abuts at its one end upon one brake shoe to cause extension of the shoe. A support shaft is extensible at a right angle with the brake lever and includes a portion tapered in its extending direction. An adjusting lever is loosely inserted over the support shaft and has its one end abutting upon one end face of the brake lever. An adjusting gear for permitting extension of an adjusting member engages with the other pawl-shaped end of the adjusting lever. A compression spring is interposed between the extended head of the support shaft and the adjusting lever. A predetermined load applied on the spring causes the adjusting lever to be biased toward the brake lever and urged against the tapered face of the support shaft.