PI 067-14 Lohr am Main, 2014-10-01

Trend towards more CVTs for small tractors

Thanks to the inline design and high efficiency, the hydrostatic compact unit A40CT combines the essential prerequisites for use in modern power-split transmissions for small tractors and transporters

With the hydrostatic compact unit A40CT from Bosch Rexroth, modern power-split transmissions are finding their way into the price-sensitive segment of small vehicles with 88 kW (120 hp) and less.

  • More efficiency, comfort and safety for small tractors
  • Continuously variable travel off-road: the new Lintrac with 66 kW (90 hp)
  • Viatrac Aebi VT450: drives purely hydrostatically up to 7 km/h

Continuously variable driving, active standstill and working in an optimum efficiency or power range – with these properties modern power-split transmissions are increasingly establishing themselves in less powerful tractors and transporters, too. Bosch Rexroth sees this trend confirmed by the market success of its hydrostatic compact unit A40CT, which is increasingly being used as a power-split transmission key component in agricultural vehicles with a power range of 59 to 88 kW (80 to 120 hp). The associated improvement potential regarding comfort, safety and efficiency are particularly illustrated by the versatile small tractor Lintrac with 66 kW (90 hp) and the special transporter Viatrac Aebi VT450 with 80 kW (109 hp).

The Lintrac, produced by the Tyrolean agricultural machinery manufacturer Lindner since mid-2014, is the first continuously variable tractor with adaptive rear axle. The vehicle, which is suitable for cultivation, mountain and grassland farming as well as municipal use, owes its multiple award-winning driving operation to the new continuously variable transmission TERRAMATIC TMT 09 from ZF Friedrichshafen, which was jointly developed with Lindner and produced in ZF's plant in Steyr. The fact that the transmission achieves very good efficiencies even with a higher hydrostatic share is largely due to the integrated hydrostatic compact unit A40CT045-045 from Bosch Rexroth. Key to this is the high nominal pressure of 450 bar at a small nominal size (45 cm3).

Another award-winning vehicle, which has successfully used the compact unit from Bosch Rexroth, originates from the special transporter category. The Viatrac Aebi VT450 Vario (Euro 6) is Aebi's new top model in this range, has an output of more than 80 kW (109 hp) and uses a new continuously variable transmission from the Austrian VDS GmbH, which was jointly developed with the vehicle manufacturer. An essential feature of the special tractor is the slow range, which drives purely hydrostatically up to 7 km/h.

"As these two exemplary applications of the hydrostatic compact unit A40CT show, modern power-split transmissions have entered the price-sensitive market segment for small tractors", commented Federico Mejia, Sales and Application Engineering Tractors at Bosch Rexroth in Elchingen. "Bosch Rexroth is on hand as an experienced technology partner for manufacturers and their model development, covering the complete power range from 59 to 441 kW (80 to 600 hp)."

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, gear technology, and linear motion and assembly technology all from one source. With locations in over 80 countries, roughly 36,700 associates generated sales revenue of approximately 5.7 billion euros in 2013.

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The Bosch Group is a leading global supplier of technology and services. In 2013, its roughly 281,000 associates generated sales of 46.1 billion euros. (NB: Due to a change in accounting policies, the 2013 figures can only be compared to a limited extent with the 2012 figures). Its operations are divided into four business sectors: Automotive Technology, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 360 subsidiaries and regional companies in some 50 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 2013, the Bosch Group invested some 4.5 billion euros in research and development and applied for some 5,000 patents. This is an average of 20 patents per day. 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

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