Lubrication oil composition
a technology of lubricating oil and composition, which is applied in the direction of lubricant composition, base materials, additives, etc., can solve the problems of affecting the effect of lubricating oil quality, and difficulty in forming oil films on sliding portions when exposed to high temperature, so as to achieve energy saving, low coefficient of traction, and high viscosity index
Inactive Publication Date: 2014-09-11
IDEMITSU KOSAN CO LTD
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Benefits of technology
The present invention provides a lubricating oil composition that has a high viscosity index and low coefficient of traction, which is excellent in saving energy and reducing fuel consumption. Additionally, the lubricating oil composition can reduce power loss in mechanical devices such as rolling bearings or gears, leading to further energy and fuel consumption savings. The lubricating oil composition includes a low-viscosity synthetic oil and a high-viscosity synthetic oil, with the low-viscosity synthetic oil containing ether bonds in a molecule. The hydrodynamic lubrication is achieved by combining these two components, with the low-viscosity synthetic oil having a kinematic viscosity of less than 10 mm2 / s. This low viscosity is required to reduce the viscosity of the lubricating oil composition and achieve energy savings. The high-viscosity synthetic oil helps to improve the viscosity of the composition.
Problems solved by technology
However, the lubricating oils having a high viscosity require a considerable amount of power upon stirring or supply thereof and therefore suffer from a large energy loss, thereby failing to achieve saving of energy and improvement in fuel consumption.
However, if the viscosity of the lubricating oils is excessively reduced, it becomes difficult to form an oil film on sliding portions when exposed to a high temperature.
As a result, there tend to occur increase in friction at the sliding portions and abnormal abrasion thereof.
However, it is not easy to reduce a coefficient of traction of the lubricating oils.
In particular, it is not easy to reduce a coefficient of traction of the lubricating oils while enhancing a viscosity index thereof to an extreme extent.
However, the effect of reducing a coefficient of traction of the lubricating oil composition as described in Patent Document 1 is not necessarily sufficient.
Method used
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examples
[0085]The present invention will be described in more detail by referring to the following examples, etc. However, it should be noted that these examples are only illustrative and not intended to limit the invention thereto.
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Abstract
The present invention provides a lubricating oil composition having an extremely high viscosity index and a low coefficient of traction as a low coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption. The lubricating oil composition according to the present invention includes the following components (A) and (B): (A) a low-viscosity synthetic oil comprising a compound containing ether bond(s) in a molecule thereof and having a kinematic viscosity of less than 10 mm2 / s as measured at 40° C., in which a ratio of the number of oxygen atoms to the number of carbon atoms as constituents of the compound (O / C ratio) and the kinematic viscosity (mm2 / s) of the compound as measured at 40° C. satisfy the following formula (1); Kinematic Viscosity at 40° C.≦12−[(O / C ratio)×30] (1); and (B) a high-viscosity synthetic oil as a hydrocarbon-based synthetic oil having a kinematic viscosity of 40 mm2 / s or more as measured at 100° C. which includes at least one compound selected from the group consisting of an α-olefin oligomer, a hydrogenated α-olefin oligomer and an ethylene-propylene co-oligomer.
Description
TECHNICAL FIELD[0001]The present invention relates to a lubricating oil composition, and more particularly, to a lubricating oil composition having a high viscosity index and a low coefficient of fluid friction in an elastohydrodynamic lubrication which is excellent in saving of energy and reduction in fuel consumption.BACKGROUND ART[0002]Lubricating oils have been inherently used for the purpose of reducing friction at sliding portions by forming an oil film on the sliding portions. Therefore, in order to form a strong oil film, it is advantageous that the lubricating oils have a high viscosity. However, the lubricating oils having a high viscosity require a considerable amount of power upon stirring or supply thereof and therefore suffer from a large energy loss, thereby failing to achieve saving of energy and improvement in fuel consumption. In consequence, in recent years, reduction in viscosity of the lubricating oils has proceeded to prevent occurrence of a power loss.[0003]Ho...
Claims
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IPC IPC(8): C10M105/40C10M105/36C10M105/18
CPCC10M105/40C10M105/18C10M2207/2805C10M2203/003C10M2207/046C10M105/36C10M107/00C10M107/34C10M2205/0225C10M2205/0245C10M2205/0285C10M2207/0406C10M2209/1075C10M2209/1085C10M2209/1095C10M2203/1006C10M2207/2815C10M2207/2825C10M2207/2835C10M2215/28C10M2219/044C10M2223/045C10N2020/02C10N2030/02C10N2010/04C10N2030/06C10N2030/54C10N2030/70C10N2040/045C10N2040/04C10N2040/02C10N2040/25C10N2060/02
Inventor TAMOTO, YOSHITAKATSUBOUCHI, TOSHIYUKI
Owner IDEMITSU KOSAN CO LTD
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