Hydrostatic transmissions provide efficiency boost
A
ZF Great Britain product story
Edited by the Engineeringtalk editorial team
Jun 2, 2008
The HC range of hydrostatic transmission systems provides improved fuel economy, reduced levels of noise and increased vehicle speeds.
ZF's Off Highway division has released the first new models in its HC range of hydrostatic transmission systems.
The 1 HC 85 and 2 HC 85 transmissions for construction machinery up to 9.5 tons and are designed with incorporated actuators and sensors, providing optimised fuel economy and handling continuously variable vehicle speeds up to 42km/h.
The integration of crankshaft-driven radial piston motors into the drive unit increases efficiency and eliminates the requirement for external hoses and valves, resulting in a reduction in interfaces to the vehicle.
The HC range provides improved fuel economy, reduced levels of noise and increased vehicle speeds.
The transmissions provide improved ride performance with a continuously variable transmission system which requires no gear shifts.
This means no interruption of traction, resulting in improved handling performance.
The electronically controlled driveline management system of the HC range also provides low start speed and a load sensor control feature optimises diesel speed even under load.
The use of crankshaft radial piston motors means that efficiency is increased and, consequently, fuel consumption is reduced.
The radial piston motors are extremely compact, giving designers increased freedom in terms of vehicle installation.
Due to their integration into the transmission system, there is no longer a requirement for external hose pipes and valves, which leads to a reduction of interfaces to the vehicle.
Compared to other hydrostatic driveline solutions using bent axis axial piston motors, ZF's crankshaft radial piston motor design is quieter in operation and has less leakage due to the efficiency of its piston seals.
In addition, the pistons in the radial piston motor are guided in pivoted cylinders, so there are no lateral forces to unbalance the transmission.
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