DRUM BRAKES

摘要

A drum brake backplate having a vibration damping mass secured thereto. One or more portions of the mass are secured to the backplate and the remainder of the mass is spaced from the backplate and defines one or more further portions which are tuned to vibrate relative to the backplate at a frequency which reduces the noise generated by one or more a target frequencies (or range of frequencies) of the backplate. The mass may be in the form of an elongate rod or strip member of arcuate form which is secured to the backplate at one or more locations adjacent the rim of the backplate. This can be effective in reducing noise which emanates from the vibration of the backplate in a region adjacent a hydraulic actuating cylinder of the brake.