PI 094-13 Lohr am Main, 2013-09-06

Motion control solutions for telehandlers: Improved controllability and lower energy consumption

Improve controllability and reduce energy consumption on telehandlers: The new Control Plus valve from Rexroth.

At Agritechnica 2013, Bosch Rexroth will be presenting for the first time two new motion control valves for telehandlers which considerably improve boom control and also enhance energy efficiency at the same time. Telehandlers are amongst the most versatile mobile machines with high sales numbers, especially in the construction and agricultural sector. While this results in a multitude of technical designs the operators’ expectations are always the same: Stability in boom movement and good controllability in order to get the best maneuverability and maximum comfort during the pick and carry operations.

Standard telehandlers are usually operated by electronic joysticks. This means that the boom movements are controlled by means of a counterbalance valve cross piloted from the opposite cylinder side. This reliable counterbalance concept is currently the most used solution for load holding and lowering control. However, the degree of fine control of the boom that can be realized with this concept is limited and often creates a challenge for the operator to reach the desired level of work effectiveness and comfort. Another drawback of the counterbalance concept is the significant amount of energy needed to lower the boom. Because of the necessary dampening devices to stabilize the lowering movement, high pressures are needed, meaning high diesel power.

The new Rexroth Control Plus is a fine metering valve that makes it possible to use a completely different concept: On telehandlers equipped with hydraulic joysticks it saves a significant amount of energy by using gravity instead of diesel power to lower the boom. This is further supported by the low pilot pressure that the Control Plus valve needs from the joystick to control the lowering movement. The resulting benefits in terms of fuel consumption and lower emissions come together with an improved controllability of the machine during lowering because the fine metering eliminates instabilities. When implementing Control Plus valves, the lowering speed of the boom is the same with and without load, which supports the operator in speeding up work cycles.

A similar solution is under development for standard telehandlers with the counterbalance design and no external pilot signal: The new Air Control valve from Rexroth, already available for aerial work platforms. Even though being cross piloted, it integrates a sub-system able to keep low and constant pressure on the rod side of the cylinder. The result is a perceivable energy saving and a high degree of stability during lowering – especially if it is used in combination with proportional valves with meter-out flow control.

The Air Control valve is designed to be completely insensitive to load pressure. In this way it ensures the absence of vibrations during boom lowering because the speed is no more affected by acceleration/deceleration due to load pressure changes, but only depends on the spool opening of the directional control valve.

Economical, precise, safe, and energy efficient: drive and control technology from Bosch Rexroth moves machines and systems of any size. The company bundles global application experience in the market segments of Mobile Applications, Machinery Applications and Engineering, Factory Automation, and Renewable Energies to develop innovative components as well as tailored system solutions and services. Bosch Rexroth offers its customers hydraulics, electric drives and controls, pneumatics, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, more than 37,500 associates generated sales revenue of approximately 6.5 billion euros in 2012.

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The Bosch Group is a leading global supplier of technology and services, active in the fields of automotive technology, energy and building technology, industrial technology, and con-sumer goods. According to preliminary figures, more than 306,000 associates generated sales of 52.3 billion euros in 2012. The Bosch Group comprises Robert Bosch GmbH and its more than 350 subsidiaries and regional companies in some 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. Bosch spent some 4.5 billion euros for research and development in 2012, and applied for over 4,700 patents worldwide. The Bosch Group’s products and services are designed to fascinate, and to improve the quality of life by providing solutions which are both innovative and beneficial. In this way, the company offers technology worldwide that is “Invented for life.”

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Susanne Herzlieb
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