Most lubricants for manual gearboxes and differentials contain extreme pressure (EP) additives and antiwear additives to cope with the sliding action of hypoid bevel gears. Typical additives include dithiocarbamate derivatives and sulfur-treated organic compounds (sulfurized hydrocarbons). Classification of Industrial Gear Oil Types. RO gear oil is formulated to contain, as additives, rust inhibitor and oxidation inhibitor and is distributed as multi-purpose oil for various applications. EP gear oil contains extreme pressure agents such as S-P additive and it is used in larger quantity than any other gear oil type.
Today gear drive operations have several options when selecting the proper lubricant for their gearboxes.
As in the past, the primary lubricant used for gearbox lubrication is mineral oil. The designation API GL-denotes lubricants intended for manual transmissions operating under such mild conditions that straight petroleum or refined petroleum oil may be used satisfactorily. Oxidation and rust inhibitors, defoamers, and pour depressants may be added to improve the characteristics of these lubricants. Viscosity is one of the most important characteristics of a gear oil.
Following are the automotive gear oil classifications: API-GL-1. Designates the type of service characteristics of automobile spiral bevel and worm gear axles as well as some manually operated transmissions operating under such mild conditions of low unit pressures and sliding velocities in which straight mineral oil can be used satisfactorily. These are measured by ASTM D4‘Method of Test for Kinematic Viscosity of temperature and Opaque Liquids’.
A ‘ Multi-grade’ oil is one whose low temperature viscosity and borderline temperature satisfy the requirements of one of the W grades and whose viscosity at 100oC is within the stipulated range of one-W-grades.
SAE Viscosity Grades for Gear Lubricants. A gear lubricant and an engine oil having the same viscosity will have widely different SAE viscosity grade designations as defined in the two viscosity classifications. For instance, an SAE 80W gear lubricant may have the same viscosity as an SAE 20W or SAE engine oil and SAE gear lubricant viscosity. They meet the GEAR OIL specifications , not transmission oil specifications. The API GL-and GL-categories do not mention or have anything to do with transmission synchronizers.
History: The gear oils of a few decades ago had lead additives that were effective at wear reduction, but not very good for the environment. Dynamic viscosity at low temperatures defines the SAE W degrees, from the initial winter, from 0W to 25W on the basis of viscosity levels measured at temperatures from -35° to -5°C. Pure GL-oil - SEM image of the wear scar (a) and EDS maps for: b) sulfur, c) phosphorus a) b) c) Fig. These oils possess a moderate level of extreme pressure additives and are the most commonly used gear oil in the modern world. The majority of transmissions use this kind of oil.
They’re primarily used with hypoid gears and other extremely loaded systems. The viscosity grade of a lube oil is determined by the Society of Automotive Engineers (SAE). Oils can be separated into multigrade oils and monograde oils. Multigrade oils must fulfill two viscosity specifications, their viscosity grade consists of two numbers, e. W-40: 10W refers to the low-temperature viscosity (Winter), refers to the high-temperature viscosity (Summer).
Gear oil is a lubricant made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery. The high temperatures values are determined according to method ASTM D445. Service Pro Premium 80W-Gear Oil Chronic Health Contains a petroleum-based mineral oil.
Prolonged or repeated skin contact can cause mild irritation. Effects Summary and inflammation characterized by drying, cracking, (dermatitis) or oil acne. API gear lubricant designations. Automotive gear lubricants are identified by viscosity grade in addition to performance level. SAE J3defines the requirements for viscosity grade classification.
This standard also defines requirements for shear stability and for proper labeling and usage of SAE viscosity number designations. Gear Tolerances - Fine Pitch Spur and Helical Gears AGMA Quality No. For full functionality of this site it is necessary to enable JavaScript.
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