Instrumentation of a contact with the Finite Element Method and experimental coupling: The case of the Swiss lever escapement mechanism
Résumé
The escapement is one of the most important elements of horological mechanisms, though little is known about it despite the considerable research conducted on the subject. The Swiss lever escapement is the most common and accounts for roughly 95% of existing mechanical watch movements. The contact occurs roughly 500,000 times within only 24 h. Since it is impossible to instrument this mechanism due to its size and position in the mechanical watch movement, it was necessary to build a Finite Element Model of the Swiss lever escapement in order to obtain local contact conditions. Obtaining knowledge of the power dissipated by the friction in the contact will lead to minimizing friction and wear through better understanding of the phenomena involved.