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The clutch actuating systems evaluated from mechanic to semi-hydraulic and finally to hydraulic. Over this time, it was necessary to improve the projects reducing vibrations and discomfort during clutch actuation. In search of the design improvement, polytetrafluoroethylene (PTFE) polymer, which is an important engineering material and also very popular due to its resistance to chemical attack in a wide variety of solvents and solutions, high melting point and low coefficient of friction when it slides against a hard surface. However, the weakness of PTFE is its poor wear resistance. This present work aims to evaluate the wear between the sliding tube and the PTFE after tests performed in rigs under predefined and controlled conditions, such as, temperature, sliding velocity, amount of actuations, application of dirty solution outside and samples with minimal and maximum clearance.

More efficient and more reliable methods to analyze the performance of the bearing test samples help to reduce validation time during development of rolling bearings. This paper presents a study of the impact on airborne noise and structural borne noise of especial prepared rolling bearings with angular contact submitted for durability tests. The study aims to link specific bearing failures to characteristics in airborne noise and structural borne noise using for instance the “envelope technique”. In the future these patterns will enable more effective online monitoring of failure evolution.