Flexible pump drive for heavy-duty applications

Large scale chipping of waste material does not only require a tough solution – it needs refinement too. This allows chippers to process shrubbery, treetops, bark and logs into wood chips of the desired sizes. In terms of technical refinements, a special pump drive from Stiebel-Getriebebau ensures a high performance and efficient drive from the diesel engine – with a Pmax = 565 kW, Tmax = 3,300 Nm and n1max = 2,000 RPM – in the new DH 910 SA precision chipper from Doppstadt. With its height of 1,020 mm, width of 750 mm and weight of around 450 kg, the type 4660 special pump drive seamlessly integrates into the compact overall concept of the mobile chipper. This machine was initially launched in May 2016 as a new development at IFAT 2016 – the world's leading trade fair for the water, wastewater, waste and recycling industry. It allows the chipping of trunk diameters of up to 900 mm. Mounted on a three-axle semitrailer chassis and with its very strong design, this machine is ideal for continuous industrial operation.

 

Safe design for tough requirements

“For such a high quality and highly stressed product, the requirement for exceptional strength also, of course, applies to the drive. Our experts have therefore placed special emphasis on a strong design”, is how Paul Hermann Schumacher, Managing Director of Stiebel-Getriebebau GmbH & Co. KG, explains the project’s development. “An integrated lubricating oil pump ensures reliable operation even when the unit is standing on steep slopes. The drive housing is of split design and is made of nodular cast iron which exhibits tremendous tensile strength thanks to its high ductility. This ensures strength and a high degree of operational capability.

 

A range of variants for different models

Stiebel-Getriebebau’s efficient solution can be used in a range of heavy-duty applications. This makes it possible to integrate different drive variants to ensure a high performance driving force. A transmission ratio range of up to i=0.6 is possible. Power can be provided by various diesel engines via an SAE flange adaptor, while highly flexible couplings or fluid couplings can be attached to the driveshaft. Driveshafts or various pulleys can be adapted for direct drive mode. The high radial forces caused by the belt drive are absorbed by special outboard bearings. Furthermore, hydraulic units in SAE sizes B-E can be installed in various combinations at the 4 pump drives using adapter kits. Pumps can also be installed on the engine side. Such adaptive versatility of its advanced pump drive allows Stiebel-Getriebebau to offer more effective drive options in the area of mobile hydraulics.