Vliv modifikátoru tření na kontakt kola a kolejnice

The Effect of Friction Modifier on the Wheel-Rail Contact

conference paper

en

One of the key factors affecting the rolling-sliding contact is traction, which is expressed by the adhesion coefficient. It is a major characteristic for safety, efficiency, reliability and maintenance costs of rail transportation. The adhesion is influenced by many factors such as contaminants, environmental and operating conditions. The friction modifier (FM) is applied on the top of rail in order to control the adhesion coefficient in required range (0.3 – 0.35). This range is often called an intermediate level of friction. This study has two aims. The first aim is to introduce tribological aspects of FM. The second aim is to in-vestigate the influence of the FM on the adhesion coefficient. The experiments were carried out on the ball-on-disc apparatus.

Trakce patří ke klíčovým faktorům ovlivňující kontakt kola a kolejnice. Trakce má zásadní vliv na bezpečnost, efektivitu, spolehlivost a také na provozní náklady. V kolejové dopravě se velikost trakce běžně vyjadřuje pomocí tzv. součinitele adheze. Tento součinitel je však výrazně ovlivňován přírodními kontaminanty, okolními podmínkami a provozními parametry. Z tohoto důvodu je do kontaktu kola a kolejnice aplikován modifikátor tření, který umožňuje řídit adhezi v požadovaném (středním) rozsahu (0,3 – 0,35). Cílem této studie je popsat tribologické aspekty související s kontaktem kola a kolejnice a současně vyšetřit vliv modifikátoru tření na adhezi v kontaktu. Experimenty byly provedeny na zařízení typu „ball-on-disc“.

One of the key factors affecting the rolling-sliding contact is traction, which is expressed by the adhesion coefficient. It is a major characteristic for safety, efficiency, reliability and maintenance costs of rail transportation. The adhesion is influenced by many factors such as contaminants, environmental and operating conditions. The friction modifier (FM) is applied on the top of rail in order to control the adhesion coefficient in required range (0.3 – 0.35). This range is often called an intermediate level of friction. This study has two aims. The first aim is to introduce tribological aspects of FM. The second aim is to in-vestigate the influence of the FM on the adhesion coefficient. The experiments were carried out on the ball-on-disc apparatus.

Kolo – kolejnice, modifikátor tření, adheze, součinitel adheze, trakce, tření, opotřebení.

Wheel – rail contact, friction modifier, adhesion, adhesion coefficient, traction, friction, wear.

2014

09.09.2014

978-80-01-05542-7

55th International Conference of Machine Design Departments

123–128

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