The influence of lubricating grease on bearing noise

There are numerous factors contributing to bearing noise, including the bearing itself, such as material quality, design and manufacturing processes, machining precision, and the surface conditions and assembly of inner and outer rings and rolling elements. Additionally, the type of lubricant grease chosen can also influence noise levels.

The influence of base oil with grease

Cycloalkane-based mineral oils, polyalphaolefin oils (PAO), ester oils, and their blends serve as the base oils in most low-noise lubricating greases. Various base oils and their corresponding viscosities exert distinct noise reduction impacts on the greases. Within a specific range, the noise produced by the lubricating greases diminishes as the viscosity of the base oil increases. However, given the high-speed operation of motor bearings, low-viscosity base oils are more favorable in terms of temperature rise and power consumption.

The influence of thickeners

The noise reduction efficacy of lubricating grease varies with the type and structure of thickeners utilized. The soap fiber structure and content also play a significant role in reducing bearing noise. Lithium-based and polyurea-based grease display commendable noise reduction abilities. The impact of thickeners on lubricating grease noise is largely attributed to the structure of soap fibers. While short fiber soap has proven to be effective in reducing noise, it necessitates a meticulous level of cleanliness for optimal results.

The influence of additives

Additives in lubricating grease can improve certain properties and enhance the performance of the grease, but the addition of additives (especially some polar additives) can have a certain impact on the colloidal structure of the grease.