ZF Introduces New Series Of Economical High-Horsepower Marine Transmissions

Two new series of economical, high-horsepower-capacity, light-al- loy marine transmissions have been introduced by ZF of North America.

The IRM 41 series and IRM 50 series marine transmissions are rated for light- and medium-duty and pleasure craft duty cycles for diesel engines, and light-duty and pleasure craft duty cycles for gasoline engines through 524 hp.

These efficient, hydraulically clutchable gearboxes remain inexpensive because it is not normally necessary to reverse a small vessel under full power. For nine-degree down angle configuration, ZF offers A^ and A3 versions. The A013 transmits full forward power with identical input and output rotation. Outboard turning counter-rotation may be accomplished by mounting an A2 to starboard and an A3 to port in an application with dual standard rotation engines.

The IRM 411 and IRM 501 are coaxial gearboxes, having the input and output on the same center line.

This design allows the engine to be mounted lower in the hull. The down angle configurations of the IRM 41A and IRM 50A provide a nine-degree output shaft, to allow more flexibility in a direct-output engine installation.

The compact design of these transmissions results in a shorter engine/transmission package, requiring less space in the hull.

ZF, headquartered in Friedrichshafen, West Germany, is a leading manufacturer of major power train components—gears, transmissions, pumps, axles and other drive systems.

Markets served include automotive, on- and off-road heavy duty vehicles, marine and special equipment industries. ZF-AG, a Fortune International 500 company, is celebrating its 75th anniversary in 1990.

ZF of North America is headquartered in Lincolnshire, 111.

For more information and free literature from ZF, C i r c l e 3 3 on Reader Service Card

Maritime Reporter Magazine, page 56, Jul 1990

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Maritime Reporter

First published in 1881 Maritime Reporter is the world's largest audited circulation publication serving the global maritime industry.