This clutch from Combidrive allows automatic distribution of power to two different transmissions according to engine speed.
The clutch is flange mounted to the flywheel of a 4 cylinder, 25kw diesel engine and the clutch works as follows:
1) The engine start and idle gives permanent drive to PTO shaft at all speeds (right side).
2) No drive is imparted to poly-vee pulley until engine speed exceeds 2300rpm.
3) At speeds above 2300 to say 3000rpm drive is available from PTO shaft and poly-vee pulley.