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Solutions from R+W
Customer: NFM
Application: Tunnel boring machines
Solution: ST /
Reinforced bearings allow for a long period of machine process the material removed into a mass that
is then used to clad the tunnel‘s walls.
disenegagement
What demands had to be fulfilled by R+W to overcome
One of the most demanding applications for ST model series
the harsh conditions prevailing more that meters un-
safety couplings is in tunnel boring machines. R+W meets
der the earth‘s surface?
this challenge with brilliance.
First of all, the main gearbox for each individual cutting
These systems are employed around the world for bo-
head must disconnect within milliseconds in the event
ring through all types of rock but how does such a system
of an overload condition. Furthermore, in such a situa-
work?
tion the safety coupling must internally release without
producing residual backlash or wear in its internal com-
A rotating cutting disc, with up to individual cutting heads
ponents because, after a load disconnect, the flywheel
arranged over its entire cutting surface, is pressure-driven
inertia at RPM can take up to half an hour to run
forward to break up the rock in its path. A screw conveyor
out. A second requirement is that the coupling‘s overall
inside the tunnel boring machine removes the crushed ma-
weight my not exceed kg.
terial from the excavation area. Systems behind the boring
DIE PERFEKTE KUPPLUNG