A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development trends on construction machinery drive trains
The study reviews actual and future market trends for construction machinery, its impact to driveline components and how the requirements can be addressed by innovative transmission and axle concepts. Before concentrating on these challenges, it might be helpful to have a glance back at the history of construction machinery drives. Specific construction solutions have been available for more than half a century. Before that it was common practice to use components from truck and other volume applications. Whereas the scope for innovations of axle concepts has been more limited, transmission technology has considerably changed over the time. Most varied concepts were available, ranging from 2-speed powershift transmissions, combined with a 2-range transmission in countershaft design over 4-speed planetary transmissions up to 5-speed fully automatic transmissions. The different solutions were based on increasingly challenging customer and market requirements. Initially robustness and reliability used to be the essential success criteria for construction machinery drives and design engineers first of all had to determine the specific loads of these applications. Load cycles for wheel loaders and similar construction machines were determined for the first time, using the related results for component design. During the second phase at the beginning of the 80s special emphasis was placed on the development of an improved driving/working performance match. Also operator comfort became a factor for market success of working machines. It was recognized that operator performance stays continuously higher over a working shift by a more comfortable workplace. Up to that period the design of the driver's cabs used to be very spartan and operating was rough. This led to improved shift quality, more ergonomic operating elements and automated shift sequences. An additional achievement was the interaction between drive systems and working hydraulics, which has only become possible, thanks to the use of first electronic control units. Today's challenges are closely related to the economic use of resources and the preservation of the environment. This requires efficient drive solutions with optimum fuel utilization and minimized environmental impact due to emissions. Further mega trends include continued increase in productivity, minimizing life cycle costs and of course the reduction of manufacturing costs.
Development trends on construction machinery drive trains
The study reviews actual and future market trends for construction machinery, its impact to driveline components and how the requirements can be addressed by innovative transmission and axle concepts. Before concentrating on these challenges, it might be helpful to have a glance back at the history of construction machinery drives. Specific construction solutions have been available for more than half a century. Before that it was common practice to use components from truck and other volume applications. Whereas the scope for innovations of axle concepts has been more limited, transmission technology has considerably changed over the time. Most varied concepts were available, ranging from 2-speed powershift transmissions, combined with a 2-range transmission in countershaft design over 4-speed planetary transmissions up to 5-speed fully automatic transmissions. The different solutions were based on increasingly challenging customer and market requirements. Initially robustness and reliability used to be the essential success criteria for construction machinery drives and design engineers first of all had to determine the specific loads of these applications. Load cycles for wheel loaders and similar construction machines were determined for the first time, using the related results for component design. During the second phase at the beginning of the 80s special emphasis was placed on the development of an improved driving/working performance match. Also operator comfort became a factor for market success of working machines. It was recognized that operator performance stays continuously higher over a working shift by a more comfortable workplace. Up to that period the design of the driver's cabs used to be very spartan and operating was rough. This led to improved shift quality, more ergonomic operating elements and automated shift sequences. An additional achievement was the interaction between drive systems and working hydraulics, which has only become possible, thanks to the use of first electronic control units. Today's challenges are closely related to the economic use of resources and the preservation of the environment. This requires efficient drive solutions with optimum fuel utilization and minimized environmental impact due to emissions. Further mega trends include continued increase in productivity, minimizing life cycle costs and of course the reduction of manufacturing costs.
Development trends on construction machinery drive trains
Beck, Hermann (author)
2010
8 Seiten, 8 Bilder
Conference paper
English
Development trends on construction machinery drive trains
| Automotive engineering | 2010