Extending the range of continuously variable transmissions

  • 19-Jun-2008 08:03 EDT

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.

HTML for Linking to Page
Page URL
Rate It
0.00 Avg. Rating

Read More Articles On

International Truck recently unveiled its all-new engine for the Class 8 market called the International A26, in addition to a new initiative called Project Alpha, which brought together a small team of powertrain engineers dedicated to a new perspective on engine development.
The company has invested in the integration of its engines, drivetrain components and power electronics into complete electric powertrain solutions for mobile off-highway machines.
Engine manufacturer Deutz AG and Liebherr Machines Bulle S.A., developer and producer of diesel and gas engines, recently agreed on the key aspects of a strategic alliance for worldwide distribution of diesel engines.
The supplier announced in late November that it began pre-production testing of its R3 hydromechanical variable transmission (HVT) at several global OEMs.

Related Items

Training / Education
Training / Education
Training / Education
Technical Paper / Journal Article