Evaluation of factors affecting vibration and noise performance of railway gears

Abstract

In order to reduce gear noise, it is general to perform processing such as shape correction of the gear contact surface. However, there is a problem that the processing cost increases. We are developing a method that enables low noise reduction at low cost by taking advantage of the damping characteristics of the gear material without changing the shape of the gear contact surface by machining. High strength ferrum casting ductile (H-FCD) has the same strength as conventional gear materials and has high material damping performance. Furthermore, the conformability of the tooth surface is also good. The amount of time history reduction of noise is large, and it is possible to omit the tooth grinding process which occupies much of the gear manufacturing cost. In this report, we first compared the material damping characteristics of general steel and FCD by exciting a simple plate. Next, the effect of gear lubricant oil on noise was evaluated by a rotation test of the H-FCD practical use gear.