Poměr tloušťek vrstev maziva na kontaktních površích po výstupu z elastohydrodynamicky mazaného kontaktu

Lubricant Rupture Ratio at Elastohydrodynamically Lubricated Contact Outlet

článek v časopise ve Web of Science, Jimp

en

Elastohydrodynamically lubricated (EHL) contacts rarely exist as single contacts. Multiple contacts or single contacts subjected to the repeated over-rolling represent more often the case in practical applications. A typical example is the rolling element bearing. A lubricant rupture mechanism at each contact outlet determines the lubricant availability to the succeeding contact. This work presents a quantitative description of the lubricant film thickness rupture in EHL contact outlet with the use of the fluorescent microscopy. A rupture ratio of the film thickness between two diverging surfaces exiting the contact was measured for both pure rolling and rolling–sliding conditions. The influence of variation of several parameters such as lubricant properties, rolling speed or rolling element ellipticity to the lubricant rupture ratio was investigated. Understanding of the physical phenomena of the lubricant rupture extends further possibilities in both experimental and theoretical researches of the starved EHL.

Elastohydrodynamicky mazané kontakty existují jako osamocené velmi zřídka. V praxi mnohem častější je série po sobě jdoucích kontaktů, či jeden kontakt podléhající vícenásobným průchodům. Typickou ukázkou může být ložisko s valivými elementy. Poměr maziva na výstupu kontaktu, které odchází z kontaktu na valivých površích definuje množství maziva dostupné pro následující kontakt. Tato práce představuje kvantitativní posouzení tohot poměru mazivan a výstupu kontaktu zapomocí fluorescenční mikroskopie. Poměr byl měřen jak pro čisté valení, tak pro definované skluzové poměry a porovnán s teorií.

Elastohydrodynamically lubricated (EHL) contacts rarely exist as single contacts. Multiple contacts or single contacts subjected to the repeated over-rolling represent more often the case in practical applications. A typical example is the rolling element bearing. A lubricant rupture mechanism at each contact outlet determines the lubricant availability to the succeeding contact. This work presents a quantitative description of the lubricant film thickness rupture in EHL contact outlet with the use of the fluorescent microscopy. A rupture ratio of the film thickness between two diverging surfaces exiting the contact was measured for both pure rolling and rolling–sliding conditions. The influence of variation of several parameters such as lubricant properties, rolling speed or rolling element ellipticity to the lubricant rupture ratio was investigated. Understanding of the physical phenomena of the lubricant rupture extends further possibilities in both experimental and theoretical researches of the starved EHL.

EHL, Starvation, Lubricant rupture

2015

21.07.2015

Springer

New York

1023-8883

59

3

1–jasne

9