CYLİNDER DESİGN. CYLİNDER LİNER LOADİNG n CYLİNDER LİNER (BARREL) DESİGN THE LİNER FUNCTİONS BOTH AS – A STRUCTURAL MEMBER – A BEARİNG SURFACE FOR THE.

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CYLİNDER DESİGN

CYLİNDER LİNER LOADİNG

n CYLİNDER LİNER (BARREL) DESİGN THE LİNER FUNCTİONS BOTH AS – A STRUCTURAL MEMBER – A BEARİNG SURFACE FOR THE PİSTON AND RİNGS DRY LİNERS ARE İNSERTED İNTO WET LİNERS n ONLY WET LİNERS ARE NORMALLY USED İN LARGE DİESEL ENGİNES

n THE LİNER THİCKNESS MAY BE CALCULATED FROM t l = Liner thickness (m)  c = Permissible cicumferential stress (kN/m 2 ) P max = Maximum combustion Pressure (kPa) D = Inner liner Diameter (m) t l = t l1 + t l2 for composite dry liners t steel > 2 mm

EFFECT OF THERMAL STRESSES  : THERMAL EXPANSION COEFFICIENT E : MODULUS OF ELASTICITY k : THERMAL CONDUCTIVITY Q : SPECIFIC HEAT FLUX

MATERIAL PROPERTIES

THE FINAL THICKNESS WILL BE ;

PROCEDURE n CHOOSE DRY LINER MATERIAL AS STEEL AND CALCULATE ITS THICKNESS n FOR WET LINER USE CAST IRON AND ALIMINUM ALLOY AND CALCULATE THEIR THICKNESSES n SUBTRACT THE STEEL LINER THICKNESS FROM WET LINER THICKNESS

EXAMPLE SUPPOSE YOU HAVE FOUND; n tlsteel = 2.5 mm n tl al = 2 mm n tlcast iron = 9.5 mm THEN YOU MAY USE EITHER A STEEL DRY LINER OF 2.5 MM AND A CAST IRON LINER OF = 7.5mm OR A STEEL DRY LINER OF 2.5 MM THICKNESS BUT WET LINER MADE OF ALIMINUM ALLOY WITH 2 mm THICKNESS.

Lcen/D = for SI engines Lcen/D = for CI engines

Liner Flange Design Calculation Taking moments around A ; Section Modulus of the cross-section between B&C ;

AS AN INITIAL ESTIMATE n D i = D + 2 (tl steel ) n D o = D i + 2 (tl CI or Al / 2 ) n L g = (D o - D i ) / D hshs 2 Lg