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
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