What are the functions and characteristics of automotive transmission oil?

The function of transmission oil alone is: to reduce friction and wear; control the friction of the clutch and the performance of the synchronizer; Load bearing (low speed, high torque, vibration load); Cooling; Reduced vibration and noise; Removal of contaminants at the tooth meshing, cleaning function; Prevents corrosion; Prevents pitting and surface metal avulsion; Isolate the metal surface, prevent direct contact with the metal body, due to various reasons, the domestic vehicle gear oil research and development work has been in a relatively backward state, for a long time, the rear axle and transmission oil of domestic automobiles are used 18 hyperbolic gear oil, and this type of gear oil foreign countries have been eliminated in the fifties. During the "Seventh Five-Year Plan" period, China successfully developed API GL-5 gear oil through the introduction of foreign vehicle gear oil evaluation benches and test methods, and issued the national standard for heavy-duty vehicle gear oil in 1992, narrowing the gap with foreign countries.

Since the end of the eighties, major domestic automobile manufacturers have gradually eliminated 18 hyperbolic gear oils and replaced them with AP1GL-4 and GL-5 oils. However, perhaps for the sake of simplifying the types of oil used, automobile factories have stipulated that transmission oil should be used uniformly for rear axle oil, and GL 5 oil is the main one. Foreign studies have proved that this practice of ignoring the working characteristics of the transmission not only affects the life of the transmission, but also reduces the transmission efficiency, and is more harmful to the new transmission with copper parts.

Some domestic automobile companies have developed special manual transmission oils and installed them in the German ZF series, Dongfeng series, and Iveco series. Limited by the current domestic assessment conditions, these development efforts should be affirmed and have merit; v European vehicle gear oil specifications are formulated by major automobile manufacturers, such as Volkswagen, Mercedes-Benz, Fiat, etc., all have their own manual transmission oil standards.

The main function of automatic transmission oil is to keep the partner system clean, lubricate and prolong the life of the transmission, and has the most effective lubrication effect even when it is resistant to low temperatures, and reduces oil loss in harsh operating environments. The ATF must meet the following requirements when working in an automatic transmission: the efficiency of power transfer is related to the viscosity and foaming degree of the oil.

Therefore, the viscosity and foaming degree of the oil should be appropriate. When ATF works in an automatic transmission, the internal working temperature of the system can reach -40 -170, the flow rate of oil can reach 20ms, and it is constantly in contact with non-ferrous metals and air, so the oxidation resistance of the oil is required. ATF should have a certain lubrication function, bearings and gears and other parts rub against each other when working, if there is no lubrication of ATF transmission oil, it will cause damage due to friction, so ATF is quite necessary in parts.

What is the role of the gearbox? Star Awareness Project

What exactly is the role of automotive transmission oil?

Transmission oil role:

Oil products that keep the gear system clean play a role in lubricating and extending the life of the transmission, and have a very effective lubrication effect even at low temperatures, reducing oil loss under severe operating conditions.

Features of transmission fluid:

Transmission oil can basically be used in the current market automatic transmission, in fact, the design of each automatic transmission has different technical requirements, even if the same model of transmission configuration in different models, its torque, weight, speed, structure, etc. will be different, so the original factory has its own designated special transmission oil. The different transmission oils are one of the reasons that affect the quality of shifting.

The most fundamental difference is the difference in its friction system, HFM-ATF has more delicate oil molecules, as well as efficient shear resistance, in the state of semi-clutch or at the moment of combination, the oil film acting on the surface of the friction material can play a very effective suspension state and slip, can buffer the momentary strong impact, so that the combination is smoother, and the gear shift is smoother. At the same time, the delicate oil molecules greatly reduce the phenomenon of jamming the valve and make the valve body work more smoothly.

1. Look at the color: **The oil is black to black-green; Bright Zen.

2. Smell the oil: **The oil has a burnt smell;

3. Look at the fluidity of oil: **After the oil is "hung on the bottle", it is not clean for a long time;

4. Look at the bubbles of the oil: After the oil is shaken, bubbles are rare;

5. Look at the viscosity of the oil: **The oil is not easy to remove when it touches your hands, and it can be drawn.

If you do not have the above characteristics, it is recommended that you be cautious, and change the fake and shoddy oil, the damage to the gearbox is very serious, and the gains outweigh the losses.

How to check transmission oil.

When you change the orange section of your engine oil, you can check your transmission oil by the way, and since the inspection process is more cumbersome, you can ask the dealer's service department to handle it. In order to measure accurately, the car must be discharged into neutral p, run at idle speed, and parked on a flat place, and the oil must run to an operating temperature of 80 93.

Note: Too much or too little oil may damage the gearbox, too much oil may cause excessive resistance to the running of the parts, or make the gearbox oil blister and deteriorate, resulting in abnormal wear and tear of the key parts. So when you check your transmission fluid, it's important to measure accurately.

1.For the gearbox.

In terms of lubricity, viscosity and oil temperature stability, especially the oil temperature of automatic transmission oil, in the case of the radiator is too dirty and the heat cannot be dissipated, the computer will enter the emergency operation mode after detecting the high temperature, and force the upshift (lock the gear, lock a specific gear to drive), there will be a "dry" fuel pedal vehicle can not run, driving has a sense of dragging, frustration, when the oil temperature exceeds 135 °, the friction plate clutch plate will cause great damage.

2.Automatic cars.

Under normal circumstances, it is replaced once every 2 years or more than 4-60,000 kilometers. The specific need to look at the driving situation, if the vehicle is in smooth gear, the gearbox noise type of the number of tones does not change much, you can not change;If the gearbox is noticeably louder when changing gears and the transmission is noticeably louder at speeds above 100 km/h, you may need to change the engine oil.

3.Manual transmission of cars.

The technology of manual transmission vehicles is mature, the failure rate is low, and the reliability is strong, and the transmission oil needs to be replaced every 3 years or every 6-80,000 kilometers.

4.When you change your engine oil, you can check your transmission oil by the way, and since the inspection process is more cumbersome, you can ask the dealer's service department to handle it. In order to measure accurately, the car must be discharged into neutral p, in order to idle.

Run and park the car in a flat place, and the oil must run to an operating temperature of 80 93.

Automotive transmission oil is a type of lubricant that is specifically used to lubricate and cool automobile transmissions. It has the following characteristics:1

High temperature stability: Automobile transmission oil needs to maintain stability at high temperatures to ensure the normal operation of the transmission. Therefore, it usually has the characteristics of good stability at high temperatures.

2.Oxidation resistance: Automobile transmission oil needs to have good oxidation resistance to prevent oxidation and deterioration of the oil during long-term use, resulting in transmission failure.

3.Anti-wear: Automotive transmission oil needs to have good anti-wear properties to prevent damage to the internal parts of the transmission due to wear.

4.Anti-foaming: Automobile transmission oil needs to have good anti-foaming to ensure that the lubricating oil inside the transmission will not produce bubbles, which will affect the lubrication effect.

5.Low-temperature fluidity: Automobile transmission oil needs to have good low-temperature macro fluidity to ensure that the lubricating oil inside the gearbox can flow in a low-temperature environment and ensure the normal operation of the gearbox.

In short, automotive transmission oil needs to have the characteristics of high temperature stability, oxidation resistance, wear resistance, foam resistance and low-temperature fluidity to ensure the normal operation and long-term use of the transmission.

Transmission oil is an oil product that keeps the gear system clean, plays a role in lubricating and extending the life of the transmission, and has the ability to resist low temperatures and can also carry out extremely effective lubrication at low temperatures, reducing oil loss under severe operating conditions. According to the different transmission structures, transmission fluids are further divided into automatic transmission fluids and manual transmission fluids. Generally known as gear oil, according to its quality level, the American Petroleum Institute divides automotive gear oil into five grades (GL-1 GL-5).

GL-1 GL-3 has lower performance requirements and is used for the lubrication of spur and bevel gears under general load, as well as gears such as gearboxes and steering gears. GL-4 is used for the lubrication of hyperbolic gear shafts and manual transmissions under the conditions of high speed, low torsional hidden torque, and low speed and high torque. The GL-5 offers the highest level of performance for the bright lubrication of hyperbolic gearshafts and manual transmissions with demanding operating conditions and high shock loads.

The transmission gear oil is generally replaced once every 2 years or 60,000 kilometers under normal driving conditions.

Transmission oil is an oil that keeps the transmission system clean, which can play a role in ensuring the normal operation of the transmission and prolonging the life of the transmission.

Reduces friction, reduces wear, controls the friction of the clutch and the performance of the synchronizer.

Load-bearing (low speed high torque, vibration load), heat dissipation, vibration and noise reduction, removal of contaminants at the tooth meshing--- cleaning function.

Prevents corrosion, prevents pitting and surface metal tearing, isolates metal surfaces, and prevents direct contact with metal bodies.

<> "I believe that most car owners understand transmission oil, and its popular name is also called gear oil of the gearbox, so what is the main role of transmission oil?

The function of transmission oil is to keep the oil ballast and wheel products of the gear system clean, play the role of lubrication and prolong the life of the transmission device, and has the effect of resisting low temperatures and carrying out extremely effective lubrication at low temperatures, reducing oil loss under severe operating conditions.

Transmission oil needs to be changed regularly, in general, the transmission oil replacement cycle first refers to the vehicle user manual, with mileage and time as a reference benchmark, whichever comes first. The structure of the manual transmission is relatively simple, generally replaced in 3 years or 60,000 kilometers, and the automatic transmission Yuxin is replaced in 2 years or about 40,000 kilometers.

On the one hand, the oil change is more thorough, prolong the oil change cycle, and on the other hand, it can also thoroughly clean the automatic gearbox to remove sludge and impurities, and keep the gearbox clean and clean.