CONCENTRIC SERIES POWER SPRINGS LOCATED IN THE MIDDLE OF THE SPRING BRAKE ACTUATOR

摘要

A power spring arrangement of a spring-type brake actuator for a vehicle brake, in which the actuator's power spring is located between the service brake actuator and parking brake release actuator, and the power spring comprises a plurality of concentric springs. The power spring is captured between the actuator's intermediate flange and a spring retainer. The use of two or more concentric springs allows higher parking brake actuator force to be generated than with a standard single power spring, without the need to enlarge the actuator housing or to use more costly spring materials or spring configurations.