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Cam driven exhaust valve actuating system for large two-stroke diesel engine

A diesel engine and exhaust valve technology, applied in engine components, engine control, machine/engine, etc., can solve the problems of no recycling, expensive, energy consumption, etc.

Inactive Publication Date: 2008-10-01
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

However, these conventional orbital electro-hydraulic systems are more expensive and more energy-intensive than conventional cam-actuated systems because more energy than required is consumed during the opening process and is not recovered during the closing process

Method used

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

Examples

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Embodiment Construction

[0033] figure 1 and 2 A cross-sectional view and a longitudinal sectional view (of one cylinder) of an engine 1 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 in a ship or a prime mover of a power plant. These engines typically have 4 to 14 in-line cylinders. The engine 1 is built on a foundation 2 with main bearings for a crankshaft 3 .

[0034] The crankshaft 3 is of the semi-combined type. The crankshaft of the semi-compound type is made of a forged or cast steel crank, which is connected to the main journal by a shrink fit connection.

[0035] The base 2 can be made in one piece or divided into appropriately sized parts according to the production equipment. The base includes side walls and welded beams with bearing supports. This beam is also known in the art as a "transverse truss". An oil pan 58 is welded to the bott...

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Abstract

A large two-stroke diesel engine with an exhaust valve actuating system comprises a cam shaft and a hydraulic push pole. The hydraulic push pole comprises a piston pump driven by the cam shaft; the cam shaft is coupled to the hydraulic exhaust valve actuator moving the relevant exhaust valve via the pipeline. A device can adds a certain quantity of hydraulic fluid to the hydraulic push pole in the controllable way before the effective working time of the cam shaft, so that the exhaust valve is opened before the limited time point of the cam profile. The device also removes a certain quantity of hydraulic fluid from the hydraulic push pole in the controllable way after the effective working time of the cam shaft, so that the exhaust valve is closed after the limited time point of the cam profile. The extra little air exchanging valve is arranged with the actuating system; the actuating system is operated independent to the cam shaft for controlling the recoil and compressing pressure of the cylinder.

Description

technical field [0001] The present invention relates to a cam-actuated exhaust valve actuation system for an internal combustion engine, in particular to a cam-actuated exhaust valve actuation system for a large two-stroke diesel engine. Background technique [0002] Large two-stroke diesel engines of the crosshead type are used, for example, for the propulsion of large ocean-going vessels or as prime movers for power plants. Not only because of their overall size, these two-stroke diesel engines are constructed unlike any other internal combustion engine. The two-stroke principle and the use of heavy fuel oil with a viscosity below 700 cSt at 50°C (which does not flow at room temperature) make these two-stroke diesel engines in a class of their own in the engine world. [0003] The need to increase performance and reduce emissions has led to the development of the usual orbital electro-hydraulic controlled exhaust valve actuation system for these large two-stroke diesel en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01L9/02F01L13/00F02D13/02
CPCF01L1/08F01L1/38F02D13/0223
Inventor 芬·考助普·延森
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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