The development of car gear oil and choose

5GPa-4.

0GPa) , circumferential rate is rapid (5m/s-10m/s, sliding velocity is tall (2m/s-10m/s) , oily Wen Gao (65 ℃ - 180 ℃ ) , friend is higher to the requirement of gear oil. Among them the working requirement of hyperbola positive drive is more slashing, taller to requirement of performance characteristics of car gear oil, in using if cannot choose appropriate gear oil correctly, of unwarrantable gear lubricate normally, what cause gear wheel easily is inchoate wear away and abrade, can cause old car and person accident even. Accordingly, of car gear oil it is very important to be chosen correctly. The classification of 2 cars gear oil and development 2.

The classification of gear oil of 1 abroad car and development. One kind is to press association of engineer of car of SAE(United States) viscosity classification, cent is 7 kinds of brands: 70W, 75W, 80W, 85W, 90, 140, 250. W of the compose that take remaining part uses gear oil for winter, it is the highest temperature that reachs S of 150Pa · according to gear oil viscosity and the viscosity of the least movement when 100 ℃ two index differentiate. Do not take end compose W use gear oil for the summer, it differentiates according to the athletic viscosity limits when 100 ℃ . Additional, still have multistage oil, wait like 80W/90, 85W/90. Another kind is to press consortium of oil of API(United States) performance characteristics classification, differentiate according to the slashing degree of working requirement for GL-1- - 6 class of GL-6. In recent years, develop ceaselessly as car technology, a lot of automobile factory business exceed these technical standards to the requirement of car gear oil. Accordingly, SAE and society of experiment of material of ASTM(United States) the proposal represents with new grade, namely MT-1 and PG-2. Among them MT-1 is mechanical transmission uses oil, GL-4 of its quality prep above, improved the thermal stability, sex that fight oxygen, kosher sex, anti-wear properties, sealed material and bronze sex of conpatibility of medicines. PG-2 quality demand is higher than GL-5, use at drive axle to lubricate. 2.

The classification of gear oil of 2 home car is current classification of domestic car gear oil also has two kinds, one kind presses viscosity classification, its classify a standard to consult SAE viscosity is classified (SAE J306) is carried out, specific if express a kind. Another kind is to press performance characteristics classification, executive standard is GB/T7631.

The 7 one appendix B of 1995. The highest temperature that the viscosity that expresses gear oil of car of 1 our country classifies viscosity brand to achieve S of 150Pa · / ℃ moves when 100 ℃ viscosity / lowest of Mm2 · S-1 is highest 70W-554.

1--75W-404.

1--80w-267.

0--85w-1211.

0--90--13.

524.

0140--24.

041.

0250--41.

Rank of gear oil of car of 0-- our country and relation of API classification correspondence expresses 2 watches gear oil of car of our country of gear oil of car of 2 our country and relation of API classification correspondence comparatives API classifies an average car gear oil (the bear in SH/T0350-92)GL-3 car gear oil (GL-4)GL-4 heavy burden, at present domestic car gear oil standard of 3 kinds of products (GL-4 is industry standard) in the series product that already had 17 kinds of names, if express 3 kinds. Express level of scale of quality of 3 car gear oil and viscosity to contrast quality scale 75W/9080W/9085W/9085W/14090140 is common car gear oil (gear oil of car of the bear in ● of ● of ● of ● of GL-3) 　 ● (gear oil of car of carry on one's shoulder of heavy burden of ● of ● of ● of ● of GL-4) ● ● (.

1 lubricity and extremely press gear oil of anti-wear properties car to should have appropriate athletic viscosity, form better lubricant position in order to assure. Car gear is in mixture lubracation and attrib border and lubricant condition more, the oily film that basically is oily agent and extremely pressure fight the reaction film that wears a lotion to act well, reduce wear extent thereby, prevent the tooth flank abrade below condition of high load capacity and agglomeration. The lubricity to gear oil and extremely press anti-wear properties, its assess index divides athletic viscosity outside, pass 4 balls even extremely press experiment machine or bench test to come assess. Use 4 balls law to be in 4 balls extremely control experiment machine the imitating test of carrying capacity of lube of aspirant travel assess, what decide lube truly through the experiment is the biggest bite bear without card (bear of PB) , agglomeration (PD) and composite wear value (the index such as ZMZ) . Make below experiment condition steel ball does not produce card to bite highest bear, bite bear without card namely, it shows the oily film strength of lube, complete oily film can maintain between surface of the attrition below this bear. Below this experiment condition, make steel ball produces the lowermost load of agglomeration, namely agglomeration bear, it shows the ultimate job ability of lubricant. Composite wear value is equal to a certain number of second average of corrective bear maths, it states lube comes from small negative charge agglomeration load is whole the average anti-wear properties of the process can. 3.

Sex of operation of 2 low temperature and stick lukewarm sex to operate a gender to microtherm, outside waiting for index except the formulary pour point, dot that become channel and viscosity index, special still used " the temperature when apparent viscosity amounts to 150Pa · S " this one index. Be in area of winter severe cold, requirement car gear oil maintains necessary liquidity below microtherm, what wait for a spare parts in order to assure bearing is lubricant it is easy to begin roll with gear. The working temperature range of car gear oil is wider also, accordingly not only the liquidity when requirement low temperature is good, and the viscosity when high temperature is worth cannot too small, have namely good stick lukewarm sex. 3.

The ability that gear oil of car of invariability of 3 hot oxidation oxidizes below condition of counteractive high temperature heats up oxidation invariability for its. Below 162 ℃ high temperature, after compulsive oxidation 50h, determine pentane not frit content, benzene not dissolve content acid value and athletic viscosity come assess. 3.

The assess of 4 corrosion resistance and rust-preventing characteristic corrosion resistance uses GB/T5096-85 " petroleum products sheet copper corrodes trial law " , rust-preventing characteristic assess uses GB/T11143-89 " add depressor mineral oil to issue test for rust preventing ability in water existence " . Of 4 cars gear oil choose choose car gear oil, basically be to determine its viscosity level and performance characteristics level, choose appropriate car gear oil with these two index. 4.

Of 1 viscosity level choose the viscosity level that chooses car gear oil the lowermost air temperature of main basis use environment and highest air temperature, recommend parameter rank to express 4. The viscosity of car gear oil should make sure the car below low thirsty requirement starts, can satisfy the lubricant requirement after oily temperature rise is fast again, consider factor of accident of cycle of oil change of car gear oil. The oil change cycle of GL-3 is 4.

50 thousand Km, the oil change cycle of GL-4, GL-5 is 50 thousand Km-6 10 thousand Km. Express level of viscosity of 4 car gear oil to choose watch environment temperature / level of viscosity of ℃ car gear oil - 57-1075W-25-4980W/90-15~4985W/90-7-49140 4.

Of level of 2 performance characteristics choose main ground speed of tooth flank pressure, slippage and oil are lukewarm wait for working requirement, and these conditions depend on again the type of gearing, the function that can press gear type and gearing so will choose the level of performance characteristics. Generally speaking, drive axle advocate transmission implement working requirement is slashing, and hyperbola gear advocate transmission implement more slashing, the performance characteristics demand to gear oil is so higher, should choose more advanced and other gear oil. Use oily level to decrease, in the car each gearing asks to differ to gear oil performance characteristics below not big case, can choose the gear oil of same level performance characteristics. Normally the circumstance falls, to assure gear lubricate normally, the drive axle that introduces model and entrance car must use GL-5 of gear oil of heavy load car, mechanical transmission is used in GL-4 of bear car gear oil. Introduce the homebred car of hyperbola gear drive axle, can use GL-4 or GL-5 gear oil, mechanical transmission uses GL-4 gear oil. The homebred car that introduces helix bevel gear and columnar gear drive axle can use gear oil of GL-3 average car or GL-4 gear oil, mechanical transmission uses GL-3 gear oil. Current, GL-3 is a breed with most dosage of car gear oil, 46% what occupy gross about; GL-4 is occupied 35% ; GL-5 is occupied 19% . Introduce foreign advanced model ceaselessly in last few years, taller and taller to requirement of car gear oil, dosage of GL-4, GL-5 also increases ceaselessly. 5 last words energy-saving, environmental protection still is to become the theme inside limits of this age bound, according to data introduction, the attrition of component of the motion in car, wear away 1/3 what take full power, will improve fuel economy through improving lubricant condition, already made the task that industry of current world automobile studies. The multistage gear oil of low viscosity is used generally in North America, Western Europe, make job of gear of transmission, drive axle is in mixture lubracation, already bouncy fluid motivation is lubricant, again border lubricates. Gear oil viscosity is opposite high stretch fluid motivation is lubricant and advantageous, because oily film ply is big, carrying capacity is high, but the attrition resistance with viscosity crude high production is great, waste more power the sources of energy. Develop as science and technology, oily in tasting, add have all sorts of extremely pressure fight wear agent, oily lotion, in order to assure enough and lubricant function. The United States ever undertook with 34 heavy truck drive a vehicle experiments, compare the section oily result of all sorts of different viscosity, the result is 75W/90 of gear oil of low viscosity car section oily effect is apparent, and 80W/90 section oily effect is not apparent. The automobile factory such as masses of our country Shanghai, one steam, 2 steam also built his testing stand to wear in succession, the station that has be admissived severally is worn, drive a vehicle experiments, the oil that approbates assessment is tasted use oil as outfit car. CNC Milling CNC Machining