Extending the range of continuously variable transmissions

  • 19-Jun-2008 08:03 EDT
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The design of ZF’s Eccom 5.0 continuously variable transmission is based on the Eccom planetary transmission combined with a performance-matched hydrostatic unit.

Continuously variable power split transmissions offer benefits to high-performance agricultural tractors with regard to the uniformly continuous increase of drawbar pull force and the transfer of full engine power in the speed range with optimum fuel efficiency. For such applications, ZF has designed a continuously variable transmission (CVT) for input powers of up to 500 hp (373 kW) that is based on the series-production Eccom transmission system. The Eccom 5.0 is essentially a “performance-optimized” Eccom planetary transmission, together with a performance-matched hydrostatic unit in back-to-back design.

With the newly adapted reverse drive range, the easy mechanical front axle connection, the optionally attachable power take-off (PTO) clutch, and the efficient pump drive for working and steering hydraulics, the system is optimally matched to the requirements of this vehicle class, claims ZF.

ZF also says that the wide overall transmission ratio, combined with high drawbar pull force when driving off, allows 40-km/h (25-mph) transport operations at reduced engine speed with optimum fuel efficiency, as well as top speeds of 50 km/h (31 mph).

The integration of efficient electronic control directly at the transmission creates a complete transmission system from one single source that represents a trend-setting alternative to full-powershift transmissions currently used as standard equipment.

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