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Exhaust valve for engine

a technology of exhaust valve and engine, which is applied in the direction of valve arrangement, machines/engines, mechanical apparatus, etc., can solve the problems of sudden ignition, achieve high mechanical properties and heat resistance, and reduce heat energy emitted , the effect of high temperature durability

Inactive Publication Date: 2015-10-22
HYUNDAI MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to an exhaust valve for an engine that is designed to be highly durable at high temperatures while also reducing heat energy emitted to the outside. The valve is achieved by applying an adiabatic coating layer that has exceptional mechanical properties and heat resistance, while also possessing low thermal conductivity and low volume thermal capacity. This coating layer improves the efficiency of the engine and the fuel efficiency of the vehicle. Additionally, the invention helps to reduce manufacturing costs by reducing the temperature of the valve without the need for expensive high heat resistant materials.

Problems solved by technology

The petroleum, gas, and gasoline engines cause ignition by an electric flame by a spark plug, and the diesel engine sprays the fuel into air at high temperatures and high pressure to cause spontaneous ignition.

Method used

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  • Exhaust valve for engine
  • Exhaust valve for engine
  • Exhaust valve for engine

Examples

Experimental program
Comparison scheme
Effect test

examples 1 to 3

(1) Manufacturing of Adiabatic Coating Composition

[0097]The porous silica aerogel (specific surface area: about 500 cm3 / g) dispersed in ethyl alcohol and the polyamideimide resin (products manufactured by Solvay SA, weight average molecular weight: about 11,000) dispersed in xylene were injected into the 20 g reactor, the zirconia bead was added thereto (440 g), and ball milling was performed under the room temperature and normal pressure condition at the speed of 150 to 300 rpm to manufacture the adiabatic coating composition (coating solution).

[0098]In this case, the weight ratio of the porous silica aerogel based on the polyamideimide resin is the same as the matter described in the following Table 1.

(2) Forming of Adiabatic Coating Layer

[0099]The obtained adiabatic coating composition was applied on a part for a vehicle engine by a spray coating method. In addition, the adiabatic coating composition was applied on the part, primary semi-drying was performed at about 150° C. for ...

experimental example 1

Measurement of Thermal Conductivity

[0105]Thermal conductivity of the coating layers on the parts obtained in the Examples and the Comparative Examples was measured on the basis of ASTM E1461 under the room temperature and normal pressure condition using the laser flash method by the thermal diffusion measuring method.

[0106]Experimental Example 2:

[0107]Measurement of Thermal Capacity

[0108]The thermal capacity was confirmed by measuring specific heat of the coating layers on the parts obtained in the Examples and the Comparative Examples on the basis of ASTM E1269 under the room temperature condition using the DSC device and using sapphire as a reference.

TABLE 1Content ofaerogel basedon 100 partsThermalThermalby weight ofThickness ofconductivitycapacity ofPAI resin (partscoating layerof coatingcoating layerby weight)(μm)layer [W / m][KJ / m3 K]Example 1151200.541216Example 2202000.3311240Example 3402000.2941124Comparative—2000.561221Example 1

[0109]As described in Table 1, it was confirmed...

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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

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present application claims priority to Korean Patent Application No. 10-2014-0046905 filed Apr. 18, 2014, the entire contents of which is incorporated herein for all purposes by this reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]An exemplary embodiment of the present invention relates to an engine for a vehicle, and more particularly, to an exhaust valve discharging an exhaust gas generated in a combustion chamber.[0004]2. Description of Related Art[0005]Generally, an internal combustion engine refers to an engine where a fuel gas generated by combusting fuel directly acts to a piston, a turbine blade, or the like to convert heat energy of the fuel into mechanical work.[0006]In many cases, the internal combustion engine refers to a reciprocal motion type engine which ignites a mixture gas of the fuel and air in a cylinder to cause an explosion and thus move a piston, but a gas turbine, a jet engine, a rocket...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01L3/04
CPCF01L3/04
Inventor BAEK, HONGKILKIM, BOKYUNGLEE, SEUNGWOOKIM, JIHOLYO, INWOONGSEO, JIYOUN
Owner HYUNDAI MOTOR CO LTD