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hydraulic actuator

A technology of hydraulic actuators and hydraulic fluids, applied in the direction of non-mechanically actuated valves, engine components, machines/engines, etc., can solve problems such as reduced reliability

Active Publication Date: 2016-10-12
WARTSILA FINLAND OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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Embodiment Construction

[0016] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0017] The hydraulic actuator according to the invention can be used in large internal combustion engines, such as in the main or auxiliary engines of ships or in engines used in power plants for generating electricity. A hydraulic actuator can be used, for example, to open a gas exchange valve or a fuel injection valve (such as a gas injection valve) of an internal combustion engine. exist Figures 2 to 6 A different gas exchange valve arrangement including a hydraulic actuator 35 according to the invention is shown in . Each gas exchange valve arrangement comprises a gas exchange valve 1, 1' which opens and closes the flow communication between the gas exchange conduit 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. ...

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Abstract

A hydraulic actuator (35) for an internal combustion engine comprises a piston (7) arranged in a boost chamber (9) for pressurizing hydraulic fluid. The piston (7) comprises a cylindrical portion (7a) provided on its outer surface with at least one opening (13b) through which hydraulic fluid can be introduced into the booster port (20a) from the inlet port (20a). In the input part (9a) of the pressure chamber (9).

Description

technical field [0001] The present invention relates to hydraulic actuators for internal combustion engines. The invention also relates to the use of hydraulic actuators. 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. Hydraulic actuators can also be used to actuate other devices of the internal combustion e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01L9/02F02M57/02F01L9/10
CPCF02M57/025F01L9/10
Inventor S·尼尼康佳斯马格努斯·松德斯滕
Owner WARTSILA FINLAND OY