Durability Investigation of plastic gears

Abstract

Plastic materials can be used for various gears and gear mechanisms due to their qualities, like wear resistance when running dry, low noise, vibration damping, low inertia, low manufacturing cost, etc. However, they also expose with temperature connected problems like rapidly decreasing load, thermal expansion and accuracy of moulded gears. Therefore, it is a challenge to produce gears with adequate accuracy and durability to serve in contemporary mechatronic applications in automotive, in medical equipment and many other industries. Such materials are POM, PA6, PA66, PEEK, reinforced plastic materials, etc. and steel. Proper combination of such materials can result in long and reliable operation of such mechanisms. On the other hand, S-gears offer improved properties in comparison to involute (Egears), which essentially comprise lower contact pressure, less sliding and frictional losses, stronger root and improved oil film when lubricated. The goal is development of advanced power transmission drive components made of polymers. So, a material database, a testing system and testing procedures with varying material combinations and gear pairs according to VDI are necessary to support a designer in proper decisions. Some material properties, especially fillers are presented. Furthermore, testing facilities, gears and some results are discussed.

Design, Simulation and Multi-Objective Optimization of a Micro-Scale Gearbox for a Novel Rotary Peristaltic Pump

“…Therefore, the material that was selected to run the simulation was PA66. The material parameters are presented in Table 2, taken from [53].…”

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

“…Traditional external lubricants utilized in metallic materials, i.e., mineral oil and mineral lubricating grease, can induce the swelling of plastic components, deteriorating their mechanical and tribological properties [19,20]. By means of this, only when choosing compatible lubricants can the performance and lifetime of plastic tribological components be effectively improved [21,22]. In actuality, internal lubricants, such as graphite-, Teflon-, and petroleum-based lubricants, have been extensively utilized in polymeric composites [23][24][25].…”

Test Rig for the In Situ Measurement of the Elastic Tooth Deflection of Plastic Gears

“…Due to their beneficial properties, they are widely used in various industrial sectors such as automotive, medical engineering and electronics [ 1 ]. Compared to metal gears, they show numerous advantages such as economic production by injection molding [ 1 ], dry run capability [ 2 ], lightweight construction [ 3 ], possibility of material modification [ 2 ] and noise reduction [ 4 ]. In terms of achievable lifetime and loading capacity, steel–plastic gear sets are the ideal pairing [ 2 ].…”