Summary of common problems of gear oil (both for automotive and industrial use)
May 17, 2022
1. How is Chinese Gear Oil classified? Answer: Chinese gear oil is divided into two categories, one is vehicle gear oil, including manual transmission gear oil and rear axle gear oil; the other is industrial gear oil, of which industrial gear oil is further divided into industrial closed gear oil, worm gear oil Worm oil, industrial open gear oil three. 2. How is the viscosity of vehicle gear oil classified? Answer: The viscosity classification of vehicle gear oil is classified as follows according to SAE J306: 3. How many kinds of vehicle gear oil? Answer: my country's vehicle gear oil is divided into three varieties: CLC ordinary vehicle gear oil, CLD medium-load vehicle gear oil, and CLE heavy-duty wheel gear oil according to the composition characteristics and functional requirements, which are equivalent to GL-3 and GL-4 classified by API respectively. , GL-5. Among them: CLC is used for manual transmission, drive axle of spiral bevel gear. CLD is used for manual transmission, and the drive axle of the hypoid gear with the helical bevel gear is not too harsh. CLE is used for drive axles of hypoid gears and other gears with severe conditions. 4. What are the viscosity grades of vehicle gear oil? Answer: Vehicle gear oil is divided into seven viscosities: 75W, 75W/90, 80W/90, 85W/90, 90, 85W/140 and 140 according to the maximum operating temperature when the kinematic viscosity at 100°C and the apparent viscosity are 150000mPa.s grade (grade). 5. How is the low temperature apparent viscosity of gear oil measured? Answer: The low temperature apparent viscosity of gear oil is the dynamic viscosity measured by Brookfield according to ASTM D2983 (GB/T 11145) method, expressed in mPa.s, the apparent viscosity is related to the low temperature fluidity of the rear axle gear Relevant, the viscosity grade (brand) of the oil is usually determined by the highest operating temperature when the apparent viscosity is 150000mPa.s.
6. What are the specifications and standards of vehicle gear oil? Answer: The standard of gear oil for ordinary vehicles in my country is SH0350-92, which is equivalent to foreign API GL-3; the standard for gear oil for medium-duty vehicles is being formulated; the standard for gear oil for heavy-duty vehicles is GB13895-92 (refer to APIGL-5 and MIL- L-2105D). Foreign vehicle gear oil specifications include manual transmission oil MT-1; rear axle gear oil API GL-5, MIL-L-2105E, PG-2. 7. What bench evaluations are required for GL-5 heavy-duty vehicle gear oil? Answer: The key to the performance evaluation of GL-5 heavy-duty vehicle gear oil is to pass four harsh bench evaluations, namely L-33 (moisture) anti-rust and anti-corrosion bench test, L-37 low-speed high-torque gear bench test, L-42 high-speed impact load bench test, L-60 or L-60-1 thermal oxidation stability and cleanliness bench test. 8. What is the main performance of MT-1 manual transmission oil? What bench evaluations are required? Answer: The main properties of MT-1 manual transmission oil are good corrosion resistance, thermal oxidation stability, sealing material adaptability and anti-wear durability. Detergency bench test evaluation. 9. What is multi-stage gear oil and how to express it? Answer: Multi-grade gear oil refers to the oil that can reach the level of low-viscosity gear oil in low-temperature fluidity and high-viscosity gear in high-temperature lubrication in a wide temperature range. Its representation is: XXW/XXX (ie low viscosity number + W/high viscosity number), such as 75W/90 85W/140 and so on. 10. What are the advantages of multi-grade vehicle gear oil? Answer: Multi-grade gear oil has both good low-temperature start-up and good high-temperature lubricity, and has a certain energy-saving effect. Foreign vehicle gear oil is mostly multi-grade gear oil. 11. How to choose vehicle gear oil? Answer: The selection principle of vehicle gear oil mainly determines the quality grade of oil used according to the type of drive axle, working conditions, load and speed, etc., and determines the viscosity grade of oil according to the minimum ambient operating temperature and the maximum operating temperature of the transmission. In general, GL-3 is used for the drive of helical bevel gears, such as Jiefang and Yuejin vehicles; single-stage hypoid gears with medium speed and load, the average contact stress of the tooth surface is below 1500MPa, and GL-3 is used for the rear axle of domestic vehicles. 4 or GL-5 vehicle gear oil, such as Dongfeng brand cars, Beijing Jeep; high-speed heavy-duty hyperbolic gear, tooth surface contact stress up to 2000-4000MPa, sliding speed 10m/s, such as Shanghai, Hongqi, Santana cars and various For imported cars, GL-5 vehicle gear oil must be used. 12. How to choose the viscosity grade of vehicle gear oil according to the ambient temperature? Answer: In principle, under the condition of low temperature and small load, the vehicle gear oil with lower viscosity can be selected, and under the condition of higher temperature and heavier load, the oil with higher viscosity can be selected. ① The ambient temperature is not lower than 0℃, optional 90, 85W/140 If the ambient temperature is not lower than -20℃, you can choose 85W/90, 85W/140 The ambient temperature is not lower than -35°C, 80W/90 must be selected When the ambient temperature reaches -45°C, 75W must be selected ② For vehicles with heavy loads or poor road conditions, a high viscosity grade vehicle gear oil should be used. 13. What items should be monitored in the use of vehicle gear oil? What is the standard for changing gear oil for ordinary vehicles? Answer: The items that should be monitored in the use of vehicle gear oil include kinematic viscosity, moisture, acid value, pentane insoluble matter, zinc content, etc. The oil change standard for ordinary vehicle gear oil is SH/T0475-92. 14. How is my country's industrial closed gear oil classified? Which varieties are there? Answer: Industrial closed gear oil is divided into three types: L-CKB anti-rust and anti-oxidation industrial gear oil, also known as ordinary industrial gear oil, L-CKC medium-load industrial gear oil, and L-CKD heavy-duty industrial gear oil. Among them, L-CKB has four viscosity grades of 100, 150, 220, and 320, and only first-class grades are set; L-CKC has seven grades of 68, 100, 150, 220, 320, 460, and 680, with first-class grades and There are two kinds of qualified products; L-CKD has six varieties of 100, 150, 220, 320, 460 and 680, but only first-class products. 15. What is the standard of industrial closed gear oil in my country? Answer: my country's industrial closed gear oil product specification is GB5903-95. Among them, L-CKB is equivalent to AGMA250.04R&O; L-CKC is equivalent to AGMA250.03EP; L-CKD is equivalent to US 224 and is equivalent to the quality level of foreign AGMA250.04EP. 16. What is the specific meaning of light load and heavy load in industrial gear oil? Answer? "Light load means that the contact stress of the gear is lower than 500Mpa (500N/mm2), and the maximum sliding speed (Vs) on the tooth surface is generally lower than 1/3 of the linear speed (V) of the tooth on the working pitch cylinder. , Heavy load means that the contact stress of the gear is greater than 500Mpa (500N/mm2), and the maximum sliding speed (Vs) on the tooth surface is higher than 1/3 of the linear speed (V) of the tooth pitch on the working pitch cylinder. 17. What is industrial open gear oil? What are the characteristics? Answer: Industrial open gear oil is an oil suitable for the lubrication system of low-speed heavy-duty gear devices without gearbox or semi-enclosed gearbox. Good adhesion is an important feature of open gear oil. 18. What are the specifications of industrial open gear oil? Answer: my country can only produce ordinary open gear oil at present. The standard is SH0363-92. There are five viscosity grades of 68, 100, 150, 220 and 320 (according to 100 ℃ kinematic viscosity), and its quality level is between AGMA251.02 ( There is a big gap between R&O) and AGMA251.02 (Mild EP) compared with foreign countries. 19. What is worm gear oil? What are the characteristics? Answer: Worm gear oil is suitable for steel worm copper worm gear transmission system. Worm gear oil has good anti-friction performance, anti-rust and anti-corrosion, anti-oxidation and anti-emulsification performance. The extreme pressure type also has excellent anti-wear properties. 20. How many kinds of worm gear oil in my country? What viscosity grades (grades) are available? Answer: my country's worm gear oil is currently divided into ordinary worm gear oil CKE (grease type) and heavy-duty worm gear oil CKE/P (extreme pressure type). 1000 Five viscosity grades (grades). 21. What is the product standard of worm gear oil? Answer: The product standard of CKE|, CKE/P worm gear oil is SH0094-91, which is divided into two quality grades: first-class product and qualified product. O3Comp specification products are comparable. 22. How to choose industrial gear oil? Answer: The principle of industrial gear oil selection is to select the type of industrial gear oil according to the contact stress of the tooth surface, the type of gear and the working conditions; the viscosity grade of the gear oil is selected according to the circumferential speed of the pitch circle and the rolling pressure. 23. What is the oil change index for industrial gear oil? Answer: At present, my country's industrial gear oil only promulgated the oil change index of L-CKC industrial closed gear oil, and the standard number is SH/T0586-94.
