Ke y w o r d s:p i s t o n ; f i n ite e lemen t; mechanical stress

Abs t rac t

One of th e m o st imp orta n t p arts of a n engine d i rectly g over ni ng en dura n

c e is the p ist on ,wh i c h pe r io di cly be a r the im p act o f heat l o a

d a nd m

e c hani c al load. H i g h temp e ratu re , h i gh p res sure wo rk ing en vir onment make the p isto n p i n h ol e bearing the max i m um m ec ha n i c al st r ess loa d pos itio

n f ace ev en g re at e r challe nge. P isto n boss works in the t emp erature o f a b o u t 20 0 °C , a n d th e fr i ctio n bet w een the p ist on pin hole and p i s ton p i n a lso p rod u ce s a h i g h te m p erature l oad.Th ere f or e, it i s n eces ary to do t h e f

i n ite e lem e nt a n alysis for th e p i s t on ,cl ari f y dis t ri butio n o f the r m a l

of i mpro v in g p i ston s t r uct u r e de s ig n an d ad o pts t h e st ruc ture of c a st a l u minum bron z e e mbedded in th e hole i n th e pist o n pin b u Shing. The res ul ts s how that the p rogr a m has ma d e th e stress in s i d e

a chie ve d the desi re d resul t s.

i ston pin h ol e t end to b e eve n ,im p r ove d s tress conc e n trat i on p he n

o me n

o n o f t he p in h o l e a nd red u c e d the s urf ac e s t r e s s p e a k

o f the stress and me ch a n ic al s t ress of t he piston s to p r ovid e a basis fo r i mpr ov ing the d e s i g n . T h i s articl e esta bl i s h p ist on r an g e of 1/2 solid model s by PRO / E.Then usi n g

ANSYS s o ftware to cal c u l a te mech ani cal st r ess and deforma ti on o f the pi st on , we obtai n s t re s s con c entratio n i nside t h

e pist o n p i n ho 1 e, an d with a l a rge d ef

o r mat i on . In view of this, it p roposes m e a s u r es the p

p in h ol e and