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Exhaust valve for engine

A technology for engines and discharge valves, which is applied in the direction of engine components, machines/engines, lift valves, etc., can solve the problems of slow progress in the research of heat insulation materials and heat insulation structures, and achieve the effects of reducing manufacturing costs, improving efficiency, and reducing heat energy

Active Publication Date: 2015-11-11
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In particular, if the release of heat generated in the internal combustion engine to the outside through the wall of the internal combustion engine is minimized, the efficiency of the internal combustion engine and the fuel efficiency of the vehicle can be improved, but can be maintained for a long time in the internal combustion engine to which high temperature and high pressure conditions are repeatedly applied Slow progress in research on thermal insulation materials and thermal insulation structures

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 3

[0097] (1) Manufacturing of heat-insulating coating composition:

[0098] The porous silica aerogel dispersed in ethanol (specific surface area: about 500cm 3 / g) and polyamide-imide resin (product made by SolvaySA, weight-average molecular weight: about 11,000) dispersed in xylene into a 20g reactor, to which zirconia beads (440g) are added, and heated at room temperature Ball milling is performed at a speed of 150 to 300 rpm under the conditions of temperature and normal pressure to produce a heat-insulating coating composition (coating solution).

[0099] In this case, the weight ratio of the porous silica aerogel based on the polyamideimide resin is the same as that described in Table 1 below.

[0100] (2) Formation of thermal insulation coating layer

[0101] The resulting heat-insulating coating composition is applied to a component for a vehicle engine by a spraying method. In addition, the heat-insulating coating composition is applied to the part, and the first semi-drying i...

experiment Embodiment 1

[0111] Experimental Example 1: Measurement of thermal conductivity

[0112] The thermal conductivity of the coating layer on the components obtained from the Examples and Comparative Examples was measured by the thermal diffusion measurement method using the laser flash method under the conditions of room temperature and normal pressure based on ASTM E1461.

experiment Embodiment 2

[0113] Experimental Example 2: Measurement of heat capacity

[0114] The heat capacity was determined by measuring the specific heat of the coating layer on the parts obtained from the Examples and Comparative Examples using a DSC device based on ASTM E1269 and using sapphire as a control under room temperature conditions.

[0115] (Table 1)

[0116]

[0117] As described in Table 1, it was confirmed that the heat-insulating coating layers obtained in Examples 1 to 3 had 1240 KJ / m in a thickness of 120 to 200 μm 3 Heat capacity of K or less and thermal conductivity of 0.54W / m or less. Therefore, the heat-insulating coating layer obtained in Examples 1 to 3 can be applied to the coating of the components of the internal combustion engine to reduce the thermal energy released to the outside and thereby improve the efficiency of the internal combustion engine and the fuel efficiency of the vehicle.

[0118] In addition, the heat-insulating coating layer obtained from Examples 1 to 3 can ...

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Abstract

An exhaust valve for an engine which discharges an exhaust gas generated in a combustion chamber of the engine may include an adiabatic coating layer having a polyamideimide resin and an aerogel dispersed in the polyamideimide resin and having thermal conductivity of 0.60 W / m or less formed on a face portion of the exhaust valve coming into contact with a flame.

Description

[0001] Cross references to related applications [0002] This application claims priority from Korean Patent Application No. 10-2014-0046905 filed on April 18, 2014, the entire content of which is incorporated herein for all purposes of this citation. Technical field [0003] The exemplary embodiment of the present invention relates to an engine for a vehicle, and more particularly, to a discharge valve that discharges exhaust gas generated in a combustion chamber. Background technique [0004] Generally, an internal combustion engine refers to an engine in which fuel gas generated by burning fuel directly acts on pistons, turbine blades, etc. to convert the thermal energy of the fuel into mechanical work. [0005] In many cases, an internal combustion engine refers to a reciprocating engine that ignites a mixture of fuel and air in a cylinder to cause an explosion and thereby move the piston. However, gas turbines, jet engines, rockets, etc. are also internal combustion engines. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D179/08C09D7/12F01L3/06
CPCF01L3/04
Inventor 白洪吉金甫炅李昇祐金知湖吕寅雄徐知延
Owner HYUNDAI MOTOR CO LTD
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