NAF DualSync Gearbox

NAF AG has developed the mechanical DualSync gearbox which is driven by two hydraulic motors and offers full hydrostatic CVT functionality over the entire speed range.

• Configuration enables two operating modes
• Simultaneous use of both motors for high tractive power 
• Fuel-saving single-motor-mode for high driving speeds
• Both drive motors are connected with different ratios
• Motor M1 is used for higher driving speed
• Motor M2 is responsible for high tractive power, operating in combination with motor M1
• Motor M2 reaches maximum rpm at approximately 30% of the maximum vehicle speed and is then disconnected from drivetrain by a synchroniser
• Motor M2 is hydrostatically deactivated and lowers its speed to 0 rpm
• Motor M1 drives vehicle up to its top speed
• Disconnecting motor M2 reduces system losses and optimizes tractive performance of machine depending on its driving speed, resulting in advantages such as fuel savings of up to 20%
• Further benefits include robust and reliable mechanical design, improved machine control in comparison with torque converter systems, and driving diesel engine in its most efficient speed range
• Provides smooth shifting without jerky interruptions for both, up- and downshift
• Used in forestry applications up to 200 kW (268.2 hp)
• Suitable for wide range of other applications such as in construction and material handling equipment