004-13 Elchingen, 2013-01-29

Efficient high performance for compact excavators

With optimized components, Rexroth provides improved performance and more comfort for compact excava

Improved performance and more comfort for compact excavators

Rexroth optimizes LUDV components

  • Performance improved by more than 10 percent
  • Fuel consumption reduced by eight percent
  • Greater ease of operation

At BAUMA 2013 in Munich, Bosch Rexroth is presenting an improved LUDV system for compact excavators that fully exploits the vehicle's potential and improves ease of operation. In so doing, the company is responding to customer demand for flexible, highly versatile machinery.

In recent years, demand for small and medium-sized excavators has risen around the world. At the same time, customer requirements have become more complex. Today, customers want vehicles that are capable of carrying out precise maneuvers, and that can be used for a broad range of applications. Moreover, customers want to fully exploit their vehicle's engine capacity all the while keeping operating costs to a minimum. In times of high energy costs, highly efficient hydraulics combined with long service life and reliable components and systems are an absolute must for economical work machines.

Bosch Rexroth has further developed the individual components of the LUDV flow sharing system with the aim of significantly improving the performance of compact excavators while at the same time increasing fuel efficiency. The newly designed LUDV flow sharing system combines the new RS12 control block with a revised version of the tried and tested A7VO variable displacement pump. This makes it possible to significantly improve the productivity of compact excavators. At the same time, it makes operating the excavators easier and more comfortable.

With LUDV technology, the individual axles are assigned different speeds and directions of movement, and workflows are improved as a result. Moreover, with just one variable displacement pump, the number of components can be reduced and the cost of production lowered. And yet this does not compromise performance. Quite the contrary: in a test run, one of the first 6.5-ton excavators to be equipped with an A7VO pump showed an initial output 10 percent higher than that of a comparable machine. At the same time, it consumed 8 percent less fuel.

The robust axial piston pump is suitable for pressures of up to 350 bar. This allows the excavator to easily handle work situations such as trench excavation or rotation.

The new RS12 control block also contributes to improved performance. Its internal channels have been redesigned to further reduce the likelihood of a drop in pressure. The four-way control system, which is based on a closed system, can be adjusted to meet changing requirements more quickly than conventional six-way valves. This shortens the time required to develop new models and makes coordinating individual components much easier.

For everyday use, it is extremely important that the compact excavator's slewing and travel drives are compact. The MCR-X radial piston motor is especially well-suited to the requirements of compact excavators between three and eight metric tons. It is characterized by consistent performance at low speeds and a low level of operating noise. The MCR-X ideally complements the newly designed Rexroth LUDV system, and it presents an especially attractive alternative to the slewing drives currently available on the market. The Bosch Rexroth product spectrum is completed by specially developed control levers, handles, and pedals that make it possible to exploit the full performance potential of excavators of up to twelve tons.

The improved LUDV system clearly demonstrates how Bosch Rexroth optimizes machines in a manner that maximizes both productivity and energy efficiency. With flexible solutions, the comprehensive Rexroth 4EE (Rexroth for Energy Efficiency) approach supports manufacturers in optimizing existing vehicle lines and designing new ones that can meet TIER 4 norms, for instance.

Bosch Rexroth AG is one of the world’s leading specialists in the field of drive and control technologies. Under the brand name of Rexroth, the company supplies more than 500,000 customers with tailored solutions for driving, controlling, and moving. Bosch Rexroth is a partner for mobile and machinery applications, engineering, factory automation as well as renewable energies. The company covers the requirements and special needs of each of these markets. As The Drive & Control Company, Bosch Rexroth develops, produces and sells components and systems in more than 80 countries. In 2011, Bosch Rexroth, part of the Bosch Group, achieved sales of around 6.4 billion euros with 38,400 employees.

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The Bosch Group is a leading global supplier of technology and services. In the areas of automotive and industrial technology, consumer goods, and building technology, over 300,000 associates generated sales of 51.5 billion euros in fiscal 2011. The Bosch Group comprises Robert Bosch GmbH and its around 350 subsidiaries and regional companies in over 60 countries. If its sales and service partners are included, then Bosch is represented in roughly 150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. In 2011, Bosch spent approximately 4.2 billion euros on research and development and applied for over 4,100 patents. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial.

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