MAN Alpha CP Propellers Mk 3
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CP Propeller - Product Information Engineering the Future - since 1758.

MAN Alpha CP Propeller – Product Information General Description Controllable pitch propellers can utilize The purpose of this Product Informa MAN Diesel & Turbo have manufac full engine power by adjusting blade pitch tion brochure is to act as a guide in tured more than 7,000 controllable irrespective of revolutions or conditions. the project planning of MAN Diesel & pitch propellers of which the first was Turbo´s Alpha propeller equipment. They offer not only maximum speed when free sailing, but also maximum power The brochure gives a description of the In 1903 a patent was taken out...

metrical similar and incorporate large corporate the possibility for emergency The present version of MAN Diesel & servo piston diameter with low pres operation and a valve box that will keep Turbo´s Alpha propeller equipment is sure and reaction forces and few com the propeller pitch fixed in case the hy designated VBS. It features an integrat ponents, while still maintaining short draulic oil supply is interrupted. The lat ed servo motor located in the aft part overall installation length. ter is required by classification societies of the hub and sturdy designed internal components....

The ODS type is intended for this type on the forward end of the reduction gear tem leading to a more precise control of of installations and features beside the pitch feedback and the valve box. The The ODF contains the same elements ODG  Gearbox integrated ODbox unit design ensures short installation as the ODS type and comes in different For MAN Diesel & Turbo designed length and all radial holes and slots are sizes according to the selected type of gearboxes (AMG, Alpha Module Gears) located on the large diameter coupling the oil distribution and pitch control oil inlet ring a...

MAN Alpha CP Propeller – Product Information

Mechanical Design Hub design The hydraulic servo motor for pitch set ting is an integral part of the propeller hub. The design is shown in fig 6. The propeller hub is bolted to the flanged end of the tailshaft, which is hollow bored to accommodate the servo oil and pitch feedback tube. The servo piston which is bolted to the pitch control head, forms the hydraulic servo motor together with Fig. 7: Blade sealing rings the propeller cap. the time for inspection and mainte The high pressure servo oil system at the nance during docking. aft end of the hub is completely isolated from the...

ODBox Design ODS type Valve box Coupling muff The shaft mounted unit, fig. 8, consists of coupling flange with ODring, valve box and pitch feedback ring. Via the oil distribution ring, high pressure oil is supplied to one side of the servo pis ton and the other side to the drain.The piston is hereby moved, setting the de sired propeller pitch. A feedback ring is connected to the hydraulic pipe by slots in the coupling flange. The feed– back ring actuates one of two displace Hydraulic servo pipe ment transmitters in the electrical pitch feedback box which measures the ac tual pitch....

The gearbox mounted unit, fig 10, con sists in principle of the very same me chanical parts as the ODS type. How ever, the pitch feedback transmitter is of the inductive type that operates con tactless and thus without wear. The drain oil from the oil distribution is led back to the hydraulic power unit tank. Pitch feed-back Hydraulic servo pipe Fig. 10: ODF type – for gearbox mounting ODG type The gearboxintegrated unit, fig 11, consists in principle also of the very same parts as the ODF type. The main difference is the use of the gearbox sump as oil reservoir for both the pro...

Servo Oil System ODSODFODG A servo oil pump delivers high pressure oil to a high-press filter, a valve unit consisting of non return valves, safety valve, pressure adjusting valve and an electrical operated proportional valve. This proportional valve, which is used to control the propeller pitch can also be manually operated. From the proportional valve the servo oil is led to an oil distributor ring. Servo oil is also used for lubricating and cool ing of this ring. This excess servo oil is led back in the servo oil system. From the oil distributor ring high pres sure oil is led through...

flow pressure filter. One of the 2 pumps Hydraulic Power Unit is in service during normal operation. A sudden change of manoeuvre will start up the second pump; this second pump also serves as a standby pump. Stern tube oil tank A servo oil pressure adjusting valve Pitch order Oil tank forward seal ensures minimum servo oil pressure constantly, except during pitch chang es, hereby minimizing the electrical power consumption. Maximum system Servo piston pressure is set on the safety valve. The return oil is led back to the tank through a cooler and a filter. The servo oil unit is equipped...

Propeller Shaft and Coupling Flange The tailshaft is made of normalized and stress relieved forged steel, table 1. Injectors The tailshaft is hollow bored, housing the servo oil pipe. Material Forged steel type Installation dimension Tensile strength Impact strength The distance between the aft and for ward stern tube bearings should gener A Measurement for push-up stampedon the coupling muff ally not exceed 20 times the diameter of the propeller shaft. If the aft ship de sign requires longer distances, special countermeasures may be necessary to avoid whirling vibration problems....

As standard, the stern tube is provided Installation of propeller equipment into with forward and after stern tube seals the ship hull can be done in many dif of the lip ring type having three lip rings ferent ways as both yards and own in the after seal and two lip rings in the ers have different requirements of how to install and how to run the propeller equipment. Other designs of stern tube Hydraulic bolts The propeller equipment can be sup Lead-based white metal Fig. 18: Stern tube white metal liner MAN Diesel & Turbo are available with plied with hydraulic fitted bolts for easy...