ZF chooses radial motor technology for its hydrostatic transmission
Two five-piston radial motors are used in ZF's 2HC85 transmission
ZF has chosen a pair of radial hydraulic motors for use in its compact single-speed hydrostatic transmission, the 2HC85, which has been developed for compact wheeled loaders up to 100kW and 10.5tonnes operating weight.
For high-torque start-up, the transmission sends oil to both motors and demands maximum stroke to travel from 0-16kph, before isolating one motor and then using 100% oil flow through the remaining motor to propel the machine to its maximum travel speed of 42kph.
ZF said radial motors afford a lower working speed range within the transmission and create a more compact package compared to axial motors, which leads to greater installation options and a low working noise level compared to traditional hydrostatic transmission designs.