|
Workmaster (WM) Deck Mounted Hydraulic
Thrusters
Home > Products
> Propulsion
Units > Hydraulic
> Workmaster
-
 |
Workmasters™ are deck-mounted or transom-mounted hydraulic
propulsion units. Workmaster™ models range from 35 to 1,000
HP. They feature steering through 180° and proportional propeller
speed control in forward and reverse, providing omnidirectional
thrust capability. Hydraulic power kick-up and propeller depth
adjustment are available. Matched to application from stock components.
The outboard drive assembly includes the steering actuator,
drive and stem rotation mechanisms, outboard stem, propeller
hydraulic motor, propeller, and the outboard tilt mechanism.
Routine servicing of the outdrive does not require disassembly
of the unit.
|
- Workmaster with optional pilothouse,
- navigation lights, and extended base frame.
|
-
Pivot Points
|
 Pivot
points are incorporated in the outboard drive to allow elevation
of the stem for inspection or maintenance. Elevation (tilt) is
accomplished without disconnecting the outboard drive from the
main power source so that operational control may be returned
immediately and to permit maintenance and repair without employing
divers or dry-docking the vessel.
-
Hydraulic Power-Tilt System
 The
propulsion unit incorporates a hydraulic power tilt system capable
of elevating the outboard drive assembly through an arc of 90
degrees. Hydraulic oil supply for the power tilt mechanism is
supplied by the steering and tilt hydraulic pump. Power tilt
hydraulic cylinders and piston rods are constructed of suitable
alloys to prevent marine atmospheric corrosion. The cylinders
are of sufficient volume and stroke to provide the full 90 degree
arc of the outboard drive while subjected to full propeller thrust
loading.
-
- The hydraulic power tilt system incorporates
cross-port relief valves that allow the outdrive assembly to
kick up in the event it encounters a subsurface obstruction or
in the case of grounding, making them ideal for shallow draft
applications.
|
-
Propeller Depth Adjustment Mechanism
|
 An
optional propeller depth adjustment mechanism can be provided
to vary the propeller depth for light and loaded draft conditions.
Hydraulic oil supply for the mechanism is supplied by the steering
and tilt hydraulic pump. When the vessel is in shallow water,
the propeller can be lifted above or even with the baseline;
when in deep water, the propeller can be lowered below the baseline
for maximum propulsive efficiency.
-
-
- This Construction
Barge uses two Workmasters with Tilt and Lift.
|
Propellers and Nozzles
|
- Open-wheel units are with a Gawn-series,
4-blade, high-thrust, manganese-bronze monoblock propeller. A
heavy-duty anti-cavitation plate covers the propeller to prevent
vortexing at light ship displacements. Nozzle units are equipped
with a Kaplan accelerator-series, 4-blade manganese-bronze monoblock
propeller inside a Kort 19A style steel nozzle.
-
- The propeller diameter, blade pitch
and area ratio is calculated to provide either maximum static
bollard thrust or maximum thrust at the required vessel speed
taking into account the vessel draft conditions.
|
Steering System
|
- Each propulsion unit is equipped with
electric over hydraulic steering, with a hydraulic steering actuator
interconnected with a drive and rotation mechanism powered by
the steering and tilt hydraulic pump. The unit steers 180 degrees,
port to starboard, while subjected to full propeller thrust,
facilitating the vessel's ability to maneuver nearly independent
of wind and wave excitation forces.
|
Hydraulic Propulsion Motor
|
- The hydraulic propulsion motor is a
bi-directional, variable-speed motor directly driving the propeller
shaft. The hydraulic motor is installed inside the fabricated
steel lower outdrive housing. The propeller shaft is supported
by large, oil-lubricated taper roller bearings. The motor produces
the required propeller rotative speed and is capable of complete
direction reversal at full speed and torque in less than five
(5) seconds. Propeller speed can be infinitely controlled in
both forward and reverse directions providing excellent maneuvering
ability and performance equivalent to controllable pitch propellers.
Pressure limiters and cross reliefs protect the hydraulic transmission
in the event of propeller blockage. The propeller can be stalled
at any time without causing damage to the transmission.
|
Service Life
|
- The propeller shaft oil-lubricated
taper roller bearings have an L10 service life in excess of 20,000
hours based on operation at full load.
|
Outdrive Mounting
|
- The outboard drive assembly is supported
by a common steel skid integrated with the diesel-hydraulic power
unit or a steel mini-skid arrangement, containing the hydraulic
tilt cylinders and suitable for mounting to the vessel's deck
at the transom by bolt-down or welding.
|
Diesel-Hydraulic Power Units
|
 |
- The Workmaster™ WM-series units
are available integrated with a diesel-hydraulic power pack.
Alternatively, they can be provided with a modular power pack
for remote mounting in any convenient space, or can be installed
in any machinery space below decks. Each deck-mounted diesel-hydraulic
power unit consists of an industrial radiator-cooled diesel prime
mover, a hydrostatic main hydraulic pump operating in a closed-loop
hydraulic system, hydraulic and engine cooling equipment, hydraulic
reservoir, filters, hoses and piping, engine exhaust system with
critical muffler, and other related parts and equipment.
|
- Oyster Barge with Workmaster Series
with Diesel Hydraulic Power Unit on side to fit a smaller space.
|
- The diesel engine drives a hydraulic
pump package providing power for the propulsion and steering
of the thruster. The engine is complete with mechanical variable-speed
governor, water jacket and pump, engine flywheel adapter and
torsional resilient coupling for mounting the main hydraulic
pump, electric start motor, alternator, and all standard accessories
such as air filter, fuel filter and water separator, and lube
oil filter. Engine cooling is by high ambient temperature radiator
heat exchanger. The engine is equipped with all standard accessories,
including ammeter, water temperature gauge, lube oil pressure
gauge, engine hour meter, tachometer and speed control, low lube
oil pressure and high jacket water temperature shutdowns.
|
Enclosures
|
 The
diesel-hydraulic power unit can be provided as an open arrangement,
with a sheet metal enclosure for rain and spray protection or
with a full enclosure with large side maintenance doors. A sound-attenuating
enclosure is also available.
-
-
-
600HP
Open Skid Sea Water Cooled HPU - Note PTO housing option on front.
|
Engine Room Installations
|
- For engine room installations, the
hydraulic power pack is provided with an engine flywheel adapter
for direct mounting of the hydraulic pumps to the customer-supplied
diesel engine's flywheel housing. Hydraulic oil cooling is by
shell and tube heat exchanger with 90/10 cupro-nickel tubes for
sea water service. Modular hydraulic accessories are provided
for mounting in any convenient space.
|
Main Hydraulic Pump
|
- The main pump for the thruster is a
hydrostatic transmission variable-displacement axial piston pump
with an electric swashplate controller and operating in a closed-loop
system, providing non-stepping, infinitely variable propeller
speed control in both the forward and reverse directions without
the use of a reversing gear or clutch.
|
Charge, Loop Flushing and Steering-Tilt-Adjustment
Pumps
|
- Each propulsion unit is equipped with
a series of hydraulic pumps, tandem mounted to the main hydraulic
pump, which provide for charging of the closed-loop hydraulic
transmission system, loop flushing, steering, and hydraulic tilt
and depth adjustment of the outdrive assembly.
|
Hydraulic Accessories
|
- The hydraulic system is provided with
a loop flushing valve, charge flow filter, hydraulic reservoir
with baffle plate, pressurized breather, return filter, magnetic
separator, suction strainer, level gauge, hydraulic oil temperature
gauge, level switch and temperature switch. Either a radiator-type
or shell and tube type heat exchanger is provided for hydraulic
oil cooling. A hydraulic pressure gauge panel and isolating valves
are also included.
|
Integral Fuel Tank
|
- A fuel tank with the capacity of eight
(8) hours of operation is incorporated in the sub-base of the
deck-mounted units.
|
Thruster Controls
|
- With each ship set of propulsion unit(s),
a drop-in style remote bridge control panel can be furnished.
All controls are electric or use mechanical cables. On multiple
thruster installations, a common control panel can be furnished.
Controls for each unit include a proportional propeller speed
joystick with forward and reverse and friction-held with detent
in neutral, a time-weighted steering joystick with bi-directional
spring return to neutral, 180 degree steering angle gauge, pushbuttons
for hydraulic tilt up and down of the outdrive, power switch,
alarm lights for high hydraulic oil temperature, low hydraulic
oil level, and engine shutdown. The panel is completely electric,
based on 12 or 24 VDC electric supply.
|
|