Gear Oil Composition For Automobile, And Lubrication Method
Patent No. EP3693447 (titled "Gear Oil Composition For Automobile, And Lubrication Method") was filed by Idemitsu Kosan on Oct 2, 2018. The application was issued on Jun 25, 2025.
Patent Summary
An automobile gear oil composition comprises (A) a base oil, (B) $\ge$1% by mass sulfurized olefin as a sulfur-based extreme pressure agent (sulfur content $\ge$35% by mass), and (C) $\ge$0.5% by mass phosphorus-based extreme pressure agents consisting of an acid phosphate amine salt and a hydrogenphosphite. The composition has a 100°C kinematic viscosity of 7–12.5 $\text{mm}^2/\text{s}$ and satisfies: (i) $(a) \times (b) \times (c) \le 0.08$ and (ii) $[(a) \times (b) \times (c) / (d)] \times 10,000 \le 0.20$. Here, (a) and (b) are Shell four-ball wear track diameters (mm) at 75°C, 1500 rpm, 60 min, under 196 N and 392 N loads, respectively; (c) is the block-on-ring wear width (mm) at 120°C, 1
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Date
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EP3693447
- Application Number
- EP18865025A
- Filing Date
- Oct 2, 2018
- Status
- Granted And Under Opposition
- May 23, 2025
- Publication Date
- Jun 25, 2025
- External Links
- Slate, Register , Google Patents