Calculated Assessment of Contact Strength, Wear and Resource of Metal-Polymer Gears Made of Dispersion-Reinforced Composites

Abstract

The method of calculating the wear and life of gears with metal wheels is used to analyze the bearing capacity and tribotechnical characteristics of metal-polymer gears with wheels made of a dispersion-reinforced composite -polyamide filled with dispersed carbon and glass fibers. Taking into account the pairing of the engagement, the maximum contact pressures at the beginning of the transmission operation were estimated, as well as their changes due to wear of the teeth of the composite wheels upon reaching acceptable wear. It was established that the degree of change in initial pressures due to wear substantially depends on the gear material and, in the case of a composite gear, a significant decrease is observed at the gear input. The linear wear of the working profile of the teeth and the localization of its maximum values are determined. It is shown that the estimated transmission resource with a carbon composite gear is more than eight times higher than that with a glass-filled polyamide gear. This parameter is largely determined by the operating conditions of the master and slave transmission links. The resource of the "steel gearcomposite wheel" pair is about 2.4 times the resource of the "composite gear-steel wheel" pair. The best option is "steel gear-carbon-filled polyamide wheel", because its resource for wear is 20 times greater than that of the transmission "glass-filled polyamide gear-steel wheel".

The Impact of Lubricant Viscosity and Materials on Power Losses and Efficiency of Worm Gearbox

“…On the other hand, power losses in worm shaft seals and worm gear P GD are not load-dependant. The size of these losses is affected by the speed of rotation of the drive and driven shaft, the size of the inner diameter of the seal as well as the pressure exerted between the shaft and the rings [32]. Total power loss in seals is equal to the sum of the losses in all seals of driven shaft.…”

Improved Tribological Performance of a Polybutylene Terephthalate Hybrid Composite by Adding a Siloxane-Based Internal Lubricant

“…In view of the lower processing temperature, as well as the flexible shape manufacturing of polymeric materials, polymeric materials had numerous advantages of production, such as lower energy consumption and costs than metallic materials, which has been widely favored in the industrial field [7,8]. Some polymeric materials demonstrate low friction noise, self-lubrication, and transfer filmforming mechanisms, which are considerable prospects to be adopted in the tribological industrial field, such as to gears, bearings, and seals [9,10]. However, the neat polymeric matrix generally presents inferior mechanical properties and load-bearing properties.…”