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Intro to Marine Engineering 2E Episode 8

Tham khảo tài liệu 'intro to marine engineering 2e episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Chapter 11_ _ Shafting and propellers The transmission system on a ship transmits power from the engine to the propeller. It is made up of shafts bearings and finally the propeller itself. The thrust from the propeller is transferred to the ship through the transmission system. The different items in the system include the thrust shaft one or more intermediate shafts and the tailshaft. These shafts are supported by the thrust block intermediate bearings and the sterntube bearing. A sealing arrangement is provided at either end of the tailshaft with the propeller and cone completing the arrangement. These parts their location and purpose are shown in Figure 11.1. Thrust block The thrust block transfers the thrust from the propeller to the hull of the ship. It must therefore be solidly constructed and mounted onto a rigid seating or framework to perform its task. It may be an independent unit or an integral part of the main propulsion engine. Both ahead and astern thrusts must be catered for and the construction must be strong enough to withstand normal and shock loads. The casing of the independent thrust block is in two halves which are joined by fitted bolts Figure 11.2 . The thrust loading is carried by bearing pads which are arranged to pivot or tilt. The pads are mounted in holders or carriers and faced with white metal. In the arrangement shown the thrust pads extend threequarters of the distance around the collar and transmit all thrust to the lower half of the casing. Other designs employ a complete ring of pads. An oil scraper deflects the oil lifted by the thrust collar and directs it onto the pad stops. From here it cascades over the thrust pads and bearings. The thrust shaft is manufactured with integral flanges for bolting to the engine or gearbox shaft and the intermediate shafting and a thrust collar for absorbing the thrust. 200 Propeller thrust power Sternframe Sterntube Aft peak bulkhead Intermediate or tunnel bearings support shaft from .