Frictional coupling or brake

Abstract

A frictional coupling, especially synchronization device of gear mechanisms, with at least two coupling bodies (,) which come into frictional contact upon engagement of the coupling, wherein one coupling body consists of one ring-shaped base body (,) of metal with at least one flat, conical or cylindrical carrier surface, to which a frictional layer made of organic or inorganic frictional material (,) is attached, and at least one other coupling body of a counter body (,), preferably also made of metal, and has a counter surface which works together with the frictional layer, is further developed for closed systems such that clamping or damage to the edges can be avoided with continued unimpaired function and the usage in the new condition is facilitated. For this, a wear-material (,) made of paraffin or wax is applied, between the base body and the counter-body, onto at least one part of the surface (,′) facing the other coupling body, which material, prior to starting to operate the frictional coupling, keeps the base body (,), especially the frictional layer, from being in contact with the counter-body (,) and closes it for a short time in the first operation during the frictional contact between the coupling bodies (,) through the appearing frictional forces and the generated temperature.