The new series 606 Y drive unit from Bonfiglioli 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 non-driven steering front axles.
Only two 606 Y 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 two 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.
A multiplate hydraulic brake is mounted at the input to the drive unit to provide dynamic braking to stop the machine (assisted by the braking effect of the hydrostatic transmission and diesel engine), and static braking for parking.
Hydraulic fluid passes through the braking system and is cooled by the machine’s on-board cooling system. Heat generated by braking, and especially that generated by speed control and braking on long downhill slopes, is thus removed and dissipated.
A pipe passes through the rotational axis of the wheel hubs. This is connected to the machine’s compressed air system via a rotary joint and feeds two compressed air drop lines to the two tyres. Tyre pressure can thus be controlled and adjusted as required.
The unit is fully enclosed and all internal components, including the drive shaft, are fully protected.
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