Hydraulic actuator and gas exchange valve arrangement

A hydraulic actuator, gas exchange valve technology, applied in the direction of non-mechanical actuated valves, valve devices, engine components, etc., can solve the problem of reducing reliability

Active Publication Date: 2016-08-31
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, flexibility is often achieved at the cost of reduced reliability

Method used

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  • Hydraulic actuator and gas exchange valve arrangement
  • Hydraulic actuator and gas exchange valve arrangement
  • Hydraulic actuator and gas exchange valve arrangement

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Embodiment Construction

[0023] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0024] The hydraulic actuator and gas exchange valve arrangement according to the invention can be used in large internal combustion engines, such as in main or auxiliary engines of ships or in engines used in power plants for generating electricity. The arrangement comprises at least one gas exchange valve 1, 1' which opens and closes the flow communication between the gas exchange duct 2 and the cylinders of the engine. The gas exchange valves 1, 1' can be intake valves or exhaust valves, thus the gas exchange conduit 2 is an intake conduit or an exhaust conduit. In the embodiment shown in the figures, the arrangement comprises a first gas exchange valve 1 and a second gas exchange valve 1'. In an engine using this arrangement, each cylinder of the engine is provided with a gas exchange valve arrangement according to the invention. Prefe...

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Abstract

A hydraulic actuator (35) for opening a gas exchange valve of an internal combustion engine comprises a drive piston (7) arranged in a boost chamber (9) for pressurizing hydraulic fluid. A hydraulic valve (10) with two positions is used to operate a hydraulic actuator (35). The invention also relates to a gas exchange valve arrangement.

Description

technical field [0001] The invention relates to a hydraulic actuator for opening a gas exchange valve of an internal combustion engine. The invention also relates to a gas exchange valve arrangement. Background technique [0002] In large internal combustion engines, such as in marine or power plant engines, the gas exchange valves can be actuated mechanically or hydraulically. The most conventional way of operating intake and exhaust valves is to use a cam-actuated valve opening mechanism in which the valve is opened by the lobe of a rotating cam and closed by a valve spring. These kinds of arrangements are reliable, but also inflexible. Valve timing is difficult to adjust, and valve mechanisms can become complex if variable valve closing or opening timing is required. In electrohydraulic systems, valve timing can be easily varied. However, flexibility is often achieved at the expense of reduced reliability. Contents of the invention [0003] It is an object of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L9/02F01L9/10
CPCF01L9/10
Inventor S·尼尼康佳斯马格努斯·松德斯滕
Owner WARTSILA FINLAND OY
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