Transmission oil composition for push belt continuously variable transmission
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorSang Yeob Cha
Life of this patent
Estimating the term…
Abstract
Disclosed is a transmission oil composition for use in a push belt continuously variable transmission (CVT). The push belt CVT oil composition includes a hydrogenated base oil or a synthetic base oil admixed with a viscosity control agent, a dispersing agent, a friction control agent and other additives at specific ratios and provides improved friction characteristics, durability, thermal stability, oxidation stability and transmission performance. It can be used at various temperature ranges and can provide improved transmission efficiency (fuel efficiency).
Claims7
A push belt continuously variable transmission (CVT) oil composition comprising a base oil admixed with 2-8 wt % of a polymethacrylate viscosity control agent, 1-3 wt % of a succinimide dispersing agent, 0.5-1.5 wt % of a borated dispersing agent, 1.0-1.5 wt % of hyperalkaline borated calcium sulfonate, 0.5-1.0 wt % of hydrocarbylamine, 0.2-0.4 wt % of hyperalkaline magnesium hydrocarbylbenzenesulfonate, 0.3-0.5 wt % of calcium salicylate, and 0.2-0.4 wt % of alkyl phosphate phosphoric acid as friction control agent, 1.0-1.4 wt % of an antioxidant, 1.0-1.5 wt % of a diluent and 0.1-0.3 wt % of borated epoxide as an anti-wear agent, wherein the base oil is highly refined mineral oil or synthetic oil having a kinematic viscosity of 3-10 cSt at 100° C. and a viscosity index of at least 120.
A push belt continuously variable transmission (CVT) oil composition comprising a base oil admixed with a viscosity control agent, a dispersing agent, a friction control agent, and an antioxidant, which comprises 2-8 wt % of the viscosity control agent, 1.5-4.5 wt % of the dispersing agent, 1.0-1.5 wt % of hyperalkaline borated calcium sulfonate, 0.5-1.0 wt % of hydrocarbylamine, 0.2-0.4 wt % of hyperalkaline magnesium hydrocarbylbenzenesulfonate as the friction control agent, and 1.0-1.4 wt % of an antioxidant, wherein the viscosity control agent is a polymethacrylate (PMA) having a start architecture, wherein the base oil is highly refined mineral oil or synthetic oil having a kinematic viscosity of 3-10 cSt at 100° C. and a viscosity index of at least 120.
Dependencies are inferred from the claim text.