Cam driven exhaust valve actuation system for large two stroke diesel engine

A diesel engine and exhaust valve technology, applied in the direction of engine components, machines/engines, non-mechanical actuated valves, etc., can solve the problems of low efficiency, variable efficiency, low redundancy engines, etc., and achieve high redundancy Effect

Inactive Publication Date: 2011-06-29
曼能解决方案(曼能解决方案德国股份公司)分公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The system has low redundancy in case of damage to gears or failure of stepless capacity adjustment or natural stress and natural vibrations resulting in damage to supply pipes or damage to pipe joints and engine inoperability, that is, failure of the entire engine will cause failure
Furthermore, the efficiency of steplessly adjustable pumps varies with operating conditions and is far from high under certain conditions

Method used

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  • Cam driven exhaust valve actuation system for large two stroke diesel engine
  • Cam driven exhaust valve actuation system for large two stroke diesel engine
  • Cam driven exhaust valve actuation system for large two stroke diesel engine

Examples

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Embodiment Construction

[0030] figure 1 and figure 2 A cross-sectional view and a longitudinal sectional view of an engine 1 (of one cylinder) according to a preferred embodiment of the invention are shown respectively. The engine 1 is a crosshead single-flow low-speed two-stroke crosshead diesel engine, which can be a propulsion system of a ship or a prime mover of a power plant. These engines typically have 4 to 14 cylinders arranged in a row. Engine 1 is built on foundation 2 with main bearings of crankshaft 3 .

[0031] Crankshaft 3 is a semi-assembly. The semi-assembly type is connected by forging or casting steel bellcrank throws with the main journal through hot pressing / shrink fitting.

[0032] The base 2 can be made in one piece or divided into parts of suitable size according to the production equipment. The base consists of side walls and welded cross joists with bearing supports. Joists are also referred to in the art as "beams." An oil pan 58 is welded to the bottom of the base 2...

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Abstract

A large two-stroke diesel engine (1) with an exhaust valve actuating system including a camshaft (28) and hydraulic pushrods that include a piston pump (32) driven by the camshaft coupled via conduit (36) to a hydraulic exhaust valve actuator (34) for moving the exhaust valve (11) concerned. The camshaft is provided with an exhaust cam (29) for each cylinder, and the exhaust cam is profiled with an increased lift (30) exceeding the lift required for opening the exhaust valve. A portion of the additional volume of hydraulic fluid generated by the increased lift of the hydraulic piston pumps is diverted from the hydraulic push rod and delivered to a consumer of pressurized hydraulic fluid that is associated with the engine. The other portion of the additional volume of hydraulic fluid results in additional exhaust valve lift. The energy stored in the air spring (33) urging the exhaust valve to close is returned to the camshaft during the return stroke of the exhaust valve.

Description

technical field [0001] The present invention relates to a cam-driven hydraulic exhaust valve actuation and fuel injection system for a large turbocharged two-stroke crosshead diesel engine. Background technique [0002] Large turbocharged two-stroke crosshead diesel engines are used, for example, to propel large ocean-going vessels or as prime movers in power plants. Not only because of its sheer size, this two-stroke diesel engine is constructed differently from any other internal combustion engine. The two-stroke principle and the use of heavy fuel oil with a viscosity below 700 centistokes at 50°C (which does not flow at room temperature) make it unique in the engine world. [0003] The desire to improve performance and reduce emissions has led to the development of electro-hydraulic common rail controlled exhaust valve actuation systems and electronically controlled fuel injection systems for such large two-stroke diesel engines. An advantage of these systems is the in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L9/02F01L1/08F02M47/04F02M59/10F01L9/12F01L9/11F01L9/14
CPCF02M47/04F01L9/025F02M59/105F01L9/023F01L9/021F01L2001/34446F01L9/12F01L9/14F01L9/11F01L1/08F02M59/10
Inventor 埃里克·杜·佩德森
Owner 曼能解决方案(曼能解决方案德国股份公司)分公司
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