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Lesson 11-Marine Diesel Engines (2)

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Tham khảo tài liệu 'lesson 11-marine diesel engines (2)', ngoại ngữ, anh văn thương mại phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Lesson 11-Marine Diesel Engines 2 For better understanding of a whole diesel engine it is quite necessary to have some idea about the operation or purpose of diesel engine parts. Each part or unit has its own special function to perform and in conjunction with the other parts constitutes a diesel engine. Those who want to operate repair or assemble diesel engines must be able to recognize different parts by sight and know what their particular functions are. With different number and arrangement of cylinders diesel engines vary in their outer appearance and size as well as in the details of construction. However they all have the same main parts which though the parts may look different will perform the same functions. By parts each diesel engine can be separated into fixed parts and moving parts. Roughly speaking fixed parts refer to the bedplate which rests on a hull structure termed as engine foundation or engine seat engine frame cylinder block and cylinder cover or cylinder head while moving parts include piston connecting rod and crankshaft. The following is a brief introduction on the main parts of a diesel engine. 1. Bedplate It is to be steel plate welded and subjected to different forces such as inertia and impact of the moving parts apart from supporting the whole weight of a diesel engine. Besides forces exerting on the bedplate will become more complicated owing to hull deformation when a vessel is sailing at rough sea. Needless to say a bedplate must both be strong enough and sufficiently rigid. On a bedplate there are bearing holes for fitting Fig. 11.1 1-connecting rod thanh truyền 2-piston 3-cylinder head đầu xylanh 4-nozzle vòi phun 5-indicating valve van chỉ thị 6-exhaust valve van xả 7-cooling water nước làm mát 8-cylinder head casing hộp đầu xylanh 9-high-pressure oil pump bơm dầu cao áp 10-casing 11-bedplate bệ máy l2-camshaft trục cam l3-mainbearing ổ đỡ chính 14-crank shaft trục khuỷu 15-speed governor cái khống chế tốc độ 16-flywheel bánh .