公开(公告)号：US20190127655A1

公开(公告)日：2019-05-02

申请号：US16151462

申请日：2018-10-04

Applicant: ExxonMobil Research and Engineering Company

Inventor： Smruti A. DANCE ,  Steven KENNEDY ,  Jordan C. Smith ,  Luca SALVI

IPC: C10M129/54 ,  C10M135/10 ,  C10M133/56 ,  C10M101/02 ,  C10M107/02

Abstract: A method for improving wear control, while maintaining or improving deposit control and cleanliness, in an engine or other mechanical component lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition including a lubricating oil base stock as a major component, and specific combinations of low soap detergents, dispersants, and/or mixtures thereof, as a minor component. The low soap detergents include alkaline earth metal salicylates, alkaline earth metal sulfonates, or mixtures thereof, all having the same or different total base number (TBN). The total amount of soap delivered by the low soap detergent is less than 0.60 weight percent of the lubricating oil. The dispersants include borated and/or non-borated polyisobutylene succinimide (PIMA) having a basic nitrogen content of 1% or greater. The lubricating oils are useful in internal combustion engines.

公开(公告)号：US20190127654A1

公开(公告)日：2019-05-02

申请号：US16151481

申请日：2018-10-04

Applicant: ExxonMobil Research and Engineering Company

Inventor： Candice I. PELLIGRA ,  Smruti A. DANCE ,  Douglas E. DECKMAN ,  Steven KENNEDY

IPC: C10M105/32 ,  C10M105/06 ,  C10M101/02 ,  C10M107/02 ,  C10M129/68 ,  C10M129/54 ,  C10M129/34 ,  C10M133/16 ,  C10M135/10 ,  C10M155/04

Abstract: A method for improving wear control of a steel surface lubricated with a lubricating oil through the generation of thick tribofilms. The method includes: (i) using as the lubricating oil a formulated oil, the formulated oil having a composition comprising at least one lubricating oil base stock as a major component; and at least one lubricating oil additive, as a minor component; and (ii) forming a tribofilm on the steel surface. In time-step tribofilm formation measurements of the lubricating oil by a mini-traction machine (MTM) at constant slide-to-roll ratio (SRR), the saturation traction coefficient (fs), which correlates to tribofilm thickness on the steel surface, is greater than about 0.11. In the method of this disclosure, elongation of timing chain due to wear of chain link pins is less than about 0.07%, as determined by Ford Chain Wear (FCW) test conducted in accordance with ILSAC GF-6 specification. The lubricating oils are useful in internal combustion engines.