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Macrotype double ram stroke diesel engine with hydraulic actuating exhaust valve

A diesel engine and engine technology, applied in the direction of engine components, machines/engines, non-mechanically actuated valves, etc., can solve the problem that electric actuators cannot be used to operate exhaust valves, and achieve the effect of reducing the number of parts

Inactive Publication Date: 2008-01-23
MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the size of this engine, electrical actuators cannot be used to operate the exhaust valves

Method used

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  • Macrotype double ram stroke diesel engine with hydraulic actuating exhaust valve
  • Macrotype double ram stroke diesel engine with hydraulic actuating exhaust valve
  • Macrotype double ram stroke diesel engine with hydraulic actuating exhaust valve

Examples

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Embodiment Construction

[0070] Figure 1 shows an engine 1 according to the invention. The engine is a low speed two stroke crosshead diesel engine which may be a propulsion engine in a ship or a prime mover in a power plant. These engines typically have 6 to 16 in-line cylinders. The engine is built on a foundation 2 with main bearings for the crankshaft 3 . The base is divided into sections of suitable size according to the available manufacturing equipment. A crankcase bracket 4 of welded design type A is installed on the base. The cylinder bracket 5 is mounted on top of the crankcase bracket 5 . Tension screws (not shown) connect the base to the cylinder bracket and hold the structure together. The cylinder 6 is carried by the cylinder bracket 5 .

[0071] FIG. 2 shows the cylinder 6 of the internal combustion engine. The cylinder 6 is of the unidirectional flow type and has an exhaust port 7 in an air box 8 which is supplied with exhaust gas supercharged by a turbocharger 10 ( FIG. 1 ) from...

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Abstract

The present invention relates to a large two-stroke diesel engine (1) of the cross-head type in which the exhaust valves (11) are hydraulically actuated by providing hydraulic actuators (19) associated with each of the exhaust valves (11) with high pressure hydraulic fluid. Fuel oil or heavy fuel oil can be used as hydraulic fluid. The invention also relates to a control valve (25) for use in such an engine (1) , to a hydraulic system for such an engine (1) and to an hydraulic actuator (19) for such an engine (1).

Description

technical field [0001] The present invention relates to large two-stroke diesel engines of the crosshead type in which each exhaust valve is hydraulically actuated by supplying high pressure hydraulic fluid to a hydraulic actuator associated with the exhaust valve. Background technique [0002] Large two-stroke diesel engines of the crosshead type are commonly used in marine propulsion and as prime movers in power plants. These internal combustion engines are constructed differently from any other internal combustion engine not only because of their overall size. The two-stroke principle and the use of heavy fuel oil with a viscosity below 700cSt at 50°C (which does not flow at room temperature) put them in a class of their own in the engine world. [0003] In many conventional engines of this type, the exhaust valves and fuel injection system are actuated by rotating cams coupled directly to the engine's crankshaft. Two-stroke engines use gas exchange ports to control the...

Claims

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Application Information

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IPC IPC(8): F01L9/02F02M55/02F02M47/00F01L9/10
CPCF02M53/02F02M57/04F02M39/02F01L9/02F02M55/02F02M63/0045F01L9/10
Inventor 芬·考助普·延森
Owner MAN DIESEL & TURBO FILIAL AF MAN DIESEL & TURBO SE TYSKLAND
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