Noise Source Identification and Noise Reduction of a Double Crank Four Ring-Plate-Type Cycloid Reducer

Abstract

A double crank four ring-plate-type cycloid reducer is a new drive that has high load capacity and high transmission efficiency. The vibration and noise tests of the reducer prototype are completed using the HEAD acoustics multi-channel noise test and analysis system. The noise distributing laws of the reducer surface at different rotational speeds and different loads are obtained. The main noise sources of the reducer are identified as the noise: 1) generated by involute spur gears when they mesh; 2) generated by the four ring-plates and cycloidal gear; and 3) radiated by the cylinder block vibration because of internal excitements. The relevant noise reduction measures are proposed for each of these noise sources. The experiment results show that noise reduction is achieved. INTRODUCTION A cycloidal pinwheel drive provides many advantages, including low volume, light weight, a high reduction ratio and high efficiency. The double crank four ring-plate-type cycloid reducer driven by three gears requires no output unit and the stiffness of the output shaft is high. The tumbler bearings are placed outside the gear, instead of inside the gear as in the traditional cycloid planetary drive. Hence, the size of the bearings is no longer restricted. The double crank four ring-plate-type cycloid reducer is able to transfer larger torques than a typical planetary cycloid drive. So, it is a new drive with large value of research and development (He W.D., 2000; Li L.X., 2005; Li X., 2004). However, it generates great noise, as does other machinery, that causes great harm to workers' health. So, noise reduction research is very urgent. The vibration and noise tests of the reducer prototype are completed using the HEAD acoustics multi-channel noise test and analysis system. The characteristics of the vibration and noise are obtained and the noise sources are identified. The paper also identifies appropriate noise reduction measures. NOISE SOURCE IDENTIFICATION Test contents. The vibration and noise tests of the reducer prototype are completed using the ICCTP 2009: Critical Issues in Transportation Systems Planning, Development, and Management ©2009 ASCE 501