Page 216 - Vetus

HYDRAULIC PROPULSION SYSTEM (HPS)

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HPS

The VETUS diesel-hydraulic propulsion system can be used
to propel the boat at very low speeds on inland waterways
where wash is detrimental to the environment or when low
trolling speeds are required. Of course, it can also be used
as an emergency propulsion system, in case of main engine
trouble. The propulsion system may only be used with
propeller shafts that have a separate thrust bearing.
The VETUS diesel-hydraulic propulsion system consists
of a hydraulic motor, which is capable of producing high
radial output power, that is to say, rotating slowly but
with a high torque. The required power to drive the
hydraulic motor can be provided by a “Powerpack” (an
engine with a hydraulic pump attached) or by a generator
set with an integrated hydraulic pump. The hydraulic oil
flow is regulated proportionally, which means that the
propeller shaft can start turning extremely slowly and
that speed is built up gradually.
This hydraulic motor  drives the propeller shaft  by
means of a “Power Band” . In this case the power band
consists of 4 V-belts, vulcanized to a flat belt, forming
a complete band. The hydraulic motor is mounted on a
frame that can be moved on a rail, by means of a hydraulic
cylinder. When not in use, the power band will be slack
and hang loosely over the propeller shaft pulley under its
protective cover. When the hydraulic cylinder is activated,
the power band is tensioned around both pulleys, thus
creating mechanical transmission between the hydraulic
motor and the propeller shaft.

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