ZF Launches New, Engine-Dependent PTO for AS Tronic Transmissions

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ZF has developed a new, engine-dependent PTO. The product with the name NMV (German abbreviation for "Nebenabtrieb motorabhängig vorgebaut") is installed between the transmission and a suitable engine based on the sandwich principle. This modular design allows to combine the NMV also with the automatic and fuel-efficient transmission systems AS Tronic and AS Tronic mid. So far, engine-dependent PTOs by ZF have been available for the commercial vehicle manual transmissions Ecosplit and Ecomid. The engine-dependent PTOs are particularly attractive for commercial vehicles which require very high torques independent of driving speed for their auxiliary power units, such as concrete pumps, mobile cranes, and airport fire-fighting vehicles. The new NMV (engine-dependent PTO) provides torques of up to a total of 2,000 Nm at one or two power take-off points and thus doubles the output power compared to the previous clutch-dependent PTOs which ZF has been offering for some years already with the AS Tronic.

The product of the ZF Special Driveline Technology business unit was presented to experts for the first time at the Bauma 2010. Two designs are available: a version with an output torque of 1,000 or with 2,000 Nm. The engine-dependent PTO developed by ZF is firmly connected with the housing of the AS Tronic or Ecosplit/Ecomid transmission, has its own cooling circuit, and always turns with the engine speed, irrespective of whether the clutch is closed or open. With the new product it is possible for the first time to also combine the automatic and fuel-efficient transmission systems of the AS Tronic range with an engine dependent PTO. An SAE interface enables the PTO to be mounted to all common commercial vehicle diesel engines.

"The advantage of engine-end PTOs is that they are independent of the clutch and always turn with the engine speed", explains Herbert Demel, head of the Special Vehicle Systems product line and responsible for the development of the engine-dependent PTO. For this reason, various special vehicles depend on transmissions which can be combined with such an engine-end PTO, for example concrete pumps, sewer cleaning vehicles, fire-fighting vehicles, and mobile cranes. All of these applications require a rather high output. With cranes, for example, there is a linear correlation between torque, hoisting capacity, and setup times. With the new engine-dependent PTO, previous setup times are reduced by half – a significant contribution to increased economy in operation.

Another advantage of ZF's engine-dependent PTO is the fact that it is designed for longer operating times. This is also ensured by having a separate oil and cooling circuit. A powerful torsional vibration damper, which balances the shocks caused by the irregular rotation of the crankshaft at the engine output, is also important.

Press Contact:

Georg Ehling, Head of Marketing and Business Development

Phone: +49 7541 77-2199

Fax: +49 7541 77-90 2199

E-Mail: georg.ehling@zf.com