EFFECT OF BEARING MACROGEOMETRY ON BEARING PERFORMANCE IN ELASTOHYDRODYNAMIC LUBRICATION

During manufacturing, ideal dimension and mutual positioning of machine elements proposed in project desing can be achieved only within certain range of tolerances. These tolerances, being classified in two groups, related to micro and macro geometry of machine elements, don't have to effect the functioning of these elements. So, as for all machine elements, investigation of the effects of macro and micro tolerances for journal bearings is important. In this study, we have investigated the effect of macro geometric irregularities of journal bearings on performance characteristics. In this regard, we have studied the change of bearing performance in respect to deviation from ideal circle for an elliptic shaft with small ovality rolling in circular journal bearing.

ELASTOHÝDRODÝNAMÝK YAÐLAMADA YATAK MAKROGEOMETRÝSÝNÝN PERFORMANS KARAKTERÝSTÝKLERÝNE ETKÝSÝ

Makine elemanlarýnýn tasarým evresinde öngörülen ideal boyut ve konumlarýna üretim ve montaj aþamasýnda belirli toleranslar içinde ulaþýlabilir. Bu toleranslar genelde makine elemanýnýn mikro ve makro geometrisine iliþkin olmak üzere ikiye ayrýlmakta olup, makine elemanýnýn iþlevini etkilememeleri gerekir. Dolayýsýyla diðer bazý makine elemanlarýnda olduðu gibi kaymalý yataklarda da makro ve mikrogeometrik toleranslarýn etkilerinin incelenmesi önem arzeder. Çalýþmada kaymalý yataklarda makrogeometrik düzgünsüzlüðün performans özelliklerine etkisi ele alýnmýþtýr. Bu amaçla dairesel kaymalý yatakta ovalliði küçük olan elips biçiminde bir enkesite sahip milin dönmesi durumunda yatak performansýnýn ideal dairesel bir milden farklýlaþma derecesine göre nasýl deðiþtiði araþtýrýlmýþtýr.