Hybrid technology for Hamm’s HD+ 90i PH tandem roller goes on show

Hamm is claiming a first with its hybrid 9 tonne HD+ 90i PH tandem roller. The German manufacturer believes that it is the first roller manufacturer to develop a production-ready machine. Most hybrid solutions, as in the case of cars, combine an internal combustion engine with an electric motor. Hamm has instead combined an internal combustion engine with a hydraulic system for the tandem roller. Although the maximum load is used regularly for compacting, it is always just for a few seconds at a time.
April 23, 2018 Read time: 2 mins
Hamm’s HD+ 90i PH tandem roller: an environment-friendly hybrid

228 Hamm is claiming a first with its hybrid 9 tonne HD+ 90i PH tandem roller. The German manufacturer believes that it is the first roller manufacturer to develop a production-ready machine.

Most hybrid solutions, as in the case of cars, combine an internal combustion engine with an electric motor. Hamm has instead combined an internal combustion engine with a hydraulic system for the tandem roller.

Although the maximum load is used regularly for compacting, it is always just for a few seconds at a time. This typically occurs when starting up or for activating the vibration or oscillation. All other compaction calls for significantly less power.

The new Hamm hybrid is equipped with a smaller diesel engine in combination with a hydraulic accumulator to satisfy the load peaks.

The hydraulic system works rather like a pumped storage power station: as soon as the power demand falls below the maximum load of the internal combustion engine, a pump fills the hydraulic accumulator. If a lot of power is called for, the hydraulic system functions as an auxiliary drive, able to supply a maximum short-term load of up to 20kW.

Following this the cycle begins afresh with refilling of the accumulator. Afterwards there is sufficient time to replenish the accumulator.

Hamm says that this technology allows the roller to deliver the same power but using a smaller diesel engine.

Two other components of the HD+ 90i PH also help to ease the load on the diesel engine: an efficiency-optimised electric fan drive and an efficient start-stop system.

This means that for the HD+ 90i PH an engine of just over 55kW suffices - instead of the 85kW unit in the conventional version.

For more information on companies in this article

Related Content

  • Concrete mixing technology offers advanced recipes
    February 13, 2012
    Modern concrete production plants are using technology to offer more sophisticated mix recipes as Patrick Smith reports. The growing trend towards ever more sophisticated concrete recipes calls for fully developed mixing technology. Companies are responding to the challenges with equipment that offers new levels of sophistication including computer controls and units that can deliver a huge variety of mix recipes.
    Read More
  • Asphalt paver offers wheeled or tracked options
    February 27, 2012
    Well known in the compaction field, BOMAG continues to raise its profile in the paving sector with the launch of another new machine, the BF300 paver. This model replaces the earlier Marini-developed BF331 and is said to be a combination of the best German and Italian engineering as well as sharing some features with the BF600 series launched by BOMAG during last year. Developed for the 7-8tonne class the BF300 is versatile and manoeuvrable and has a transport width of just 2.5m, even including its mounted
    Read More
  • Innovations in aggregates production will boost quarry efficiency
    March 16, 2016
    New innovations are underway that will help optimise rock crushing and screening operations and boost quarry efficiency overall - Mike Woof writes. Quarrying is a tough industry that provides enormous challenges to equipment providers as machines and technology have to be rugged, durable and productive. Cutting the cost of production while optimising output has been a major target for suppliers, with new technologies playing an increasingly important role. Taking the long view with regard to increased qu
    Read More
  • Benninghoven’s mobile asphalt plant
    May 24, 2019
    Benninghoven says that its new ECO asphalt mixing plant combines high output and mobility, while its TBA asphalt mixing plant is now available with a hot-gas generator for the first time. Made in the firm’s German factory, the new ECO plants can produce 100-320tonnes/hour of asphalt. The new plants are said to combine the latest innovations in asphalt production technology from Benninghoven with a high standard of manufacturing. Mobility is a key feature as the plant comes in compact container sizes. Thi
    Read More

Highlighted Content