PI 092-13 Lohr am Main, 2013-09-06

Extended EHR23 valve family for double-acting electro-hydraulic hitch control for mid-range tractors

Manufacturers can now cost-effectively use the new variant of the EHR23-EHS1 valves on mid-range tractors from 120 to 230 HP.

Better tillage using standard tractors

Scientific studies reveal very clearly that uniform, careful tillage has a significant impact on harvests and the long-term fertility of agricultural soils. Double-acting electro-hydraulic hitch controls open up the possibility for farmers to put these findings into practice. Rexroth has extended the EHR23 hydraulic valve family for use on standard mid-range tractors.

Plows, cultivators, and harrows: When it comes to passive tilling implements, a uniform working depth is a vital factor affecting the success of the harvest. The double-acting electro-hydraulic hitch control system developed by Rexroth has already proved its success on top-range tractors. The hitch gear raises the attached implement if it digs too deep or hits an obstacle, but also presses it actively into the soil to achieve a constant working depth.

The heart of this control system is the EHR hydraulic valve family. The family combines electronics, pilot control valve, sensors, and software to produce a closed control loop which maintains the preset working depth automatically. Rexroth pioneered the invention of the electro-hydraulic hitch control more than 30 years ago and has continued its development ever since.

Manufacturers can now cost-effectively use the new variant of the EHR23-EHS1 valves on mid-range tractors from 120 to 230 HP. The new valve controls a flow of up to 100 l/min and its compact design allows it to fit in confined design envelopes. The electro-hydraulic pilot control enhances stability and smoothens out hitch movements. This improves tilling quality.

The electro-hydraulic hitch control also reduces slippage and significantly prevents the drive wheels from losing traction. This preserves the soil and reduces the risk of erosion. In addition, the control system enhances operator convenience since it finds control parameters automatically and lowering high loads is load-compensated. The Rexroth valve family also offers variants for single-acting electro-hydraulic hitch controls across the entire power range.

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
Maria-Theresien-Straße 23
97816 Lohr am Main
Phone: +49 9352 18-1573