This new drive unit is specifically designed for driving road roller wheels.
It is specially shaped and sized for installation on roller-compactors which generally feature rear axles with four drive wheels and steering front axles with idle wheels.
Only two units are needed to drive all four wheels on the rear axle, each unit powering two wheels. Drive is delivered through a hydrostatic transmission system with two variable displacement axial piston motors installed horizontally along the machine's lengthwise axis at 90° to the wheel axis, in a position where they are well protected but still easily accessible.
In design terms, the drive unit comprises 2 hubs, on which the two driven wheels are mounted. Each hub contains a double stage planetary gearbox. Inside a central connecting housing a bevel gear pair provides initial reduction and receives drive from a hydraulic motor through a mechanical drive shaft. The central casing also provides the fixing points for securing the unit to the machine.
The load bearing hubs are designed to withstand the particularly high loads that road rollers apply to their wheels.