Page 27 - Vetus

HYDRAULIC PROPULSION

In many cases it may be preferable to drive the propeller shaft by means of a hydraulic motor, instead of using the
conventional set up of engine and gearbox.

How it works
A hydraulic vane pump is fitted to the
engine in place of the gearbox. This pump
draws hydraulic fluid from a storage tank
and delivers it under pressure to the speed
and direction control valve. The control
valve determines the direction and volume
of hydraulic flow to the hydraulic vane
motor, which can then rotate clockwise
or counter clockwise as selected. This
hydraulic motor drives the propeller shaft
via a flexible coupling.
The VETUS system uses a hydraulic pump
and motor with fixed swept volumes.
The transmission ratios (reduction) in the
propulsion system are achieved by the
difference in volume between the vane
pump and the hydraulic motor.

The reduction between the engine RPM
and the shaft RPM is 2:1 for models
HPM4.35, HPM4.45 and HPM4.56 and
1.9:1 for model HPH4.65. The maximum
permissible engine power is 50 kW (67 HP),
with a maximum engine speed of 3,000
RPM. In most cases a shaft diameter
Ø 1’’ (25 mm) will suffice. The output
flange of the VETUS hydraulic motor fits
all VETUS flexible couplings.

Scope of supply

VETUS hydraulic propulsion is available in 4 versions:
Model HPM4.35 has a VETUS M4.35 marine diesel engine of MODEL HPM4.56 has a VETUS M4.56 marine diesel
24.3 kW (33 hp). engine of 38 kW (52 hp).
Model HPM4.45 has a VETUS M4.45 marine diesel engine of Model HPH4.65 has a VETUS VH4.65 marine diesel engine of
30.9 kW (42 hp). 48 kW (65 hp).

VETUS hydraulic Stainless steel VETUS hydraulic
vane motor storage tank vane pump
All versions include
• Hydraulic vane pump
• Adapter flange and coupling to fit the
pump to the relevant engine
• Hydraulic vane motor
• 35 litre hydraulic oil tank
• Oil cooler
• Control valve
• Flexible engine mounts
• Engine instrument panel and loom

1. Hydraulic vane motor
2. Mechanically operated control valve
3. Stainless steel storage tank
4. Hydraulic vane pump
5. Remote control handle with cable
6. Connection for ancillary devices
7. Control unit for ancillary devices
8. Bow thruster
9. Anchor windlass

Creators of Boat Systems 27