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Centa carbon fiber shafting coupling drive shaft in ship propulsion application


German Centa company specializes in the production and development of high elastic coupling, clutch, carbon fiber shafting, universal shaft transmission device and shock absorber. There are more than 20 types of products with torque coverage of 10 ~ 1000000nm, which are widely used in ships, locomotives, engineering machinery (concrete pumps such as ABS trucks, excavators, rollers, milling machines, motors with hydraulic pumps, and other hydrostatic drives such as platform vehicles), construction machinery, wind power generation, diesel generator sets, air compressors, special vehicles, road sweepers, engine test stands, warships, speedboats, hovercraft Transmission systems for large ships and industrial equipment. At present, more than 10 million couplings are in use all over the world

over the past few years, the chairman and founder of German Centa Antriebe Kirschey company have made great progress in the high-speed ferry market and ship type design, mainly by increasing the propulsion power and reducing the hull weight to improve the speed

therefore, a series of new high-power diesel engines have been developed and applied. At the same time, the application of gas turbine is becoming more and more attractive, and the weight of hull and marine equipment is also being reduced. Nowadays, aluminum materials are widely used in high-speed monohull and catamaran ships

in the trend of reducing the hull weight, the weight reduction of the power transmission components of the propulsion system has also been put on the agenda. Typically, on a high-speed ship with two or four high-speed diesel engines driving the water jet propeller through the reduction gearbox, the distance between the diesel engine and the gearbox or between the gearbox and the water jet propulsion device is shortened. Especially in the narrow space of the catamaran, four diesel engines are required to be arranged at random, and the power from the front diesel engine must be transmitted through the rear diesel engine. Therefore, this requires the transmission device with the lightest weight and the least components

the drive shaft made of carbon fiber tube can easily reduce the weight of transmission components

main advantages of carbon fiber drive shaft

1) significantly reduce the weight of the drive shaft. Compared with the hard steel shaft, the weight of the carbon fiber shaft is significantly reduced by about 70%, including the metal parts that must be proposed at the end of the composite pipe. In fact, only the carbon fiber pipe itself is very light. Generally, it can be specified as follows: the longer the shaft, the greater the weight reduction. Below, we mainly talk about how to calibrate and detect the composite shaft. The more obvious the effect is

2) high critical speed. Since the speed is set, the advantage of using carbon fiber shaft is reflected in the long propulsion shafting. In other words, the distance between the bearings will be longer. Therefore, the long shaft system usually does not need to be equipped with bearings. With the improvement of environmental protection standards, at least the number of bearings is reduced, which not only reduces the cost, reduces the shaft system, reduces the components, but also saves the cost of bearing supports and reduces the weight

3) long service life, low noise, no corrosion, no friction, maintenance free, non-conductive and non-magnetic

design features

all composite shafts of Centa are designed to be lightweight, with the minimum weight and the best size. Therefore, a set of computer program is specially developed to design the most efficient filament layering systems, so that the propulsion shaft has good technical characteristics. Centa brand carbon fiber composite shaft is unique in that it adopts an active locking system, that is, a tapered titanium metal pin is used to pin the steel or aluminum metal flange. This technology provides an economical and reliable solution to power transmission and is protected by patents. This active locking system increases the safety factor of shafting to 6 times under rated torque and 3 times of fatigue strength

in order to avoid the dangerous stress caused by the assembly deviation of the shaft and the distortion of the hull, Centa company adopts flexible connection at both ends of the shaft tube in principle

actual ship usage

since 1996, nearly 100 carbon fiber shafts have been delivered for ship propulsion system, most of which are used in high-speed ferries, but some are also used in military ships, patrol boats, luxury yachts, racing boats, dredgers and pump stations

length: the length of each section can reach 8m, and any length required by the user can be combined by sections

torque: the torque that can be carried is 200 kn/m. if the user requires more torque, it can also meet the requirements

speed: the speed of the shaft can reach 300 rpm

approval: so far, this product has been approved by American Bureau of shipping, DET Norske Veritas, GL, Lloyd's register of shipping and Royal Society of shipbuilders. If it needs to be approved by other classification societies, it can also meet the requirements

finally, the user is advised that in the early stage of ship design, if Centa can intervene as soon as possible, it can provide the best propulsion system scheme based on existing experience. Because the use of carbon fiber shaft is not only the replacement of propulsion shaft materials in the general sense, it is necessary to comprehensively consider the design of carbon fiber shaft in the ship design stage

from the electronic version of international watercraft the application of carbon fiber drive shaft in ship propulsion system


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