Advantages of the hydraulic ROTODIFF© drive compared to a conventional gear box

Economic and technical advantages of the hydraulic decanter drive

ROTODIFF	Getriebe
Simple, compact, lightweight design, easy to maintain	Complex, heavy design
Low maintenance; continuous cleaning and cooling in a closed, 100% filtered system (filtered to 10 microns)	Unfiltered, uncooled closed system; retains all wear debris possibly shortening the gear box life
No gears, uses only slow-moving parts; creates less friction	Multiple gears and moving parts at higher speeds; creates more friction and higher power consumption
Scroll can run leading or lagging (optimized performance) at all speeds and torque ranges	Limited to a one-direction process
No overheating of the hydraulic motor due to automatic, continuous heat dissipation through the oil conditioning system	External cooling often required; overheating is a common problem
Perfect lubrication at high speed	Reduced lubrication caused by centrifugal forces and splashing losses
Excellent weight/torque ratio, about half the weight of gearbox with same torque capacity	Gearbox about twice the weight of ROTODIFFwith same torque
Lower overhung weight reduces both load on main bearings and machine vibration (less wear on bearings). Less weight means reduced power input	Heavy overhung gear increases load and heat on main bearing, causing reduced bearing life and more vibrations. More weight requires more power to operate
All mechanical components are protected against overload by various safeguards and finally protected by simple pressure relief valve (higher torque capacity)	Repeated high shock loads will damage and destroy in-line components and cause premature failure (Cyclo gear reduced torque capacity at higher differential speed)
One set of V-belts to drive the bowl	Multiple sets and types of belts
Versatile design for multiple application	Limited design requires different units for each application
Full range of differential speeds at all bowl speeds, including zero RPM, start-up, shutdown and standstill	Limited range of differential speeds at lower bowl speeds and standstill
Robust and reliable; process control with direct torque reading. The direct measurement of scroll torque and speed allows immediate responseto process changes	Complicated calculations of different speeds through multiple gear reductions, increase errors and dramatically slows response to process changes
Simple and accurate measurement of scroll speed; provides precise control of differential with unlimited bowl speed options Differential = speed of ROTODIFF	Complicated, indirect measurement of scroll speed; calculated from bowl and pinion speed, gearbox ratio and control error Differential = (bowl speed and pinion speed) gear box ratio
Low energy consumption; power is not lost or wasted. Scroll drive ROTODIFF operates independently from the main drive motor	Increased energy cost; gearbox design steals energy from the main drive
No drag or parasitic loss on the main drive; uses only the energy required to convey solids	Robs energy from main drive; torque adds braking horsepower; increases drag on main drive motor
Reduction or elimination of Chatter or Slip Stick	Chatter or Slip Stick damages gear box
Versatile use also in Ex-proof areas (ATEX)	Limitations on the control system or expensiv installation costs if used in Ex-proof areas (ATEX)