Gear Lubricant

Gear lubricants protect gears, bearings, and cross-shafts from premature failure, assure reliable equipment operation and increased transmission and differential service life. Gear lubricants achieve this by performing the following vital functions:

Minimizing Friction and Wear<
A film of oil must be maintained between gear teeth at all times to prevent metal-to-metal contact between gear surfaces under extreme pressure conditions. Hypoid gear drives are especially tough systems to lubricate, since the gear contact motion severely shears the lubricant with sliding as well as rolling motions and the gears severely shock loaded.

Providing Oxidation Stability<
A gear lubricant should resist degradation and sludging, so that, harmful viscosity increase is minimized over time.

Cooling the Gear Components
Gear components are prevented from destructive over-heating, by circulating lubricant through the bearing and mesh zones, where frictional heat is generated.

Inhibiting Rust and Corrosion<
A gear lubricant must be non-corrosive to bronze, and protect steel surfaces against rust, especially when water contamination is present.

Maintaining Long Clutch Life and Preventing Seal Leaks
Clutches used in wet brakes and manual transmissions can become “glazed” and lose their function, if gear lubricants decompose at high temperature. Gear lubricants must therefore, be thermally stable. Undesirable decomposition can also coat seals with carbon, causing leakage.

In addition, automotive gear lubricants must meet a number of requirements that can be satisfied only by specially formulated products. Most applications require gears lubricants that contain extreme pressure additives or antiwear additives that prevent wear, pitting, spalling, scoring, scuffing, and other types of distress that can result in component failure and downtime. Depending on the application, protection against oxidation, thermal degradation, rust, copper corrosion, and foaming must also be provided.