Manual transmission oil composition having enhanced fuel efficiency and low viscosity

Abstract

Disclosed is a manual transmission oil composition which include: (A) a polyalphaolefin (PAO) synthetic base oil in an amount of about 75 to 85 wt %; (B) an ester-based viscosity modifier in an amount of about 3 to 10 wt %; and (C) an additive in an amount of about 8 to 15 wt % which includes one or more of an anti-wear agent, a detergent dispersant, a friction modifier, an extreme pressure additive, and an anti-oxidant, based on the total weight of the manual transmission oil composition. Accordingly, the manual transmission oil composition may have a low viscosity as compared to conventional manual transmission oils, and may provide improvements in endurance of a transmission, reduction in a Rattle noise, and further improvement in fuel efficiency of vehicles by about 1 to 2%.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims under 35 U.S.C. §119(a) the benefit of Korean Patent Application No. 10-2014-0070362 filed on Jun. 10, 2014, the entire contents of which are incorporated herein by reference.TECHNICAL FIELD[0002]The present disclosure relates to a manual transmission oil composition having improved fuel efficiency and a reduced viscosity. The manual transmission oil composition includes an ester-based viscosity modifier as a viscosity modifier which is added in a predetermined amount to a polyalphaolefin (PAO) synthetic base oil thereby reducing a viscosity difference in various ranges of temperatures. Accordingly, the endurance of a transmission may be improved even though a viscosity of the composition is reduced, and fuel efficiency and low temperature gear-shifting performance of vehicles may be improved.BACKGROUND[0003]Generally, a transmission is a device installed between a clutch and a thrust shaft or between the clutch and...

AI Technical Summary

Benefits of technology

The patent text describes a new manual transmission oil composition that improves endurance of a transmission and enhances fuel efficiency of vehicles by about 1 to 2%. The oil composition has reduced viscosity at different temperatures, increased lubricity, and reduced noise while shifting at low temperatures. This new composition has improved properties compared to conventional oils.

Problems solved by technology

When the oil viscosity is substantially increased, synchronization due to friction during the contact may be disturbed and the ability to sense gear-shifting may be reduced, particularly at an ambient air temperature of about −20 to −50° C. or less, thereby causing failure of gear-shifting.

However, when the viscosity at the low temperature is reduced, the viscosity at high temperatures may be reduced accordingly, and thus this manual transmission oil may aggravate endurance of a transmission and a Rattle noise may be worsened.