Aufbau einer Pin/Disc-Modellprüftechnik zur Untersuchung von geschmierten Hochfriktionskontakten

Research output: ThesisMaster's Thesis

Authors

Abstract

The application of lubricated friction contacts, as in clutches or brakes, poses new types of challenges for the tribological system consisting of base and mating materials in the form of disc and friction pad. In addition, a new development direction of the surrounding fluid towards friction maximization in combination with wear minimization, good heat dissipation and thermal stability is required. The construction of a test rig and the development of a test strategy are essential for an in-depth investigation of a wide range of factors and influences. Within this master thesis, a test cell for a tribological model test, namely the so-called Pin-on-Disc test, was developed, designed and built. In addition, the existing test bench infrastructure was extended by an external water cooling system including an oil reservoir. On the basis of preliminary tests, it was possible to develop a stable test sequence as well as a program-technical test strategy. For an initial pre-selection of possible materials for the pin and disc specimens, an extensive material research was set up, which was supported by analyses in the scanning electron microscope with regard to composition and morphology. In the subsequent tests, a conventional organic brake pad, a copper-sintered clutch pad and a cast iron material were selected as pin materials. The disc specimens were made of low-alloyed and high-alloyed steel and also cast iron. From the tests with two different tribological oils, the highest friction value was achieved for the organic brake pad. However, the wear is also somewhat higher than for the copper-sinter clutch pad. A difference in the friction coefficients due to variation of the lubricating fluid could only be perceived very weakly. The tests with pin specimens made of cast iron and disc specimens made of high-alloyed steel showed seizure events and could thus be excluded for the intended application.

Details

Translated title of the contributionSet-up of a pin/disc-model testing technique for the investigation of lubricated high-friction contacts
Original languageGerman
QualificationDipl.-Ing.
Awarding Institution
Supervisors/Advisors
Award date15 Dec 2023
Publication statusPublished - 2023