Which parts of the car need to be grease lubricated? How does it work?

bearings, such as half-shaft bearings. Others, like the rear axle, are lubricated with gear oil, and the engine is oiled.

Youbao General Lithium Grease, which is suitable for use at various friction points of general automobiles. The use of lithium-based greases for automotive applications can extend oil drain intervals by up to two times compared to conventional calcium-based greases, reduce wear, and simplify assortment.

Lunyi bearing is the main part of the grease, straight throughout the use of 2 fat, or winter with 1 fat, summer with 2 fat. Many users are accustomed to using 3 grease all year round, the consistency of the grease is too large, which will increase the rotational resistance of the wheel bearing, and 3 grease is only suitable for use on tropical heavy-duty vehicles. Wheel bearing grease must be replaced before it is used until it is severely depleted, stratified or softened, and it is common practice to change the grease during secondary maintenance.

When changing the grease, it should be filled reasonably, and no-load lubrication should be used as much as possible.

Chassis grease is mainly used in the chassis at the bottom of the car, is the most susceptible to external influences, water, soil, impurities are easy to cause damage to the chassis, so the chassis has higher requirements for the sealing and protection of the grease. At present, the main lubricating greases used for automobile chassis are calcium-based grease, extreme pressure lithium grease, anhydrous calcium-based grease, MP grease and HP grease, some of which are common to wheel bearings.

Constant velocity joint grease is mainly used to make two axes transmit power at the same speed with constant velocity universal energy-saving, so it is widely used in automobiles. Since the invention of CVJ in 1908, CVJ's requirements for grease have been changing, from the first mineral oil to gear oil, to complex calcium-based grease, EP lithium grease, and now CVJ grease.

The main lubrication points for rearview mirrors are: the contact part between the motor shaft and the bearing, the reduction wheel and the worm gear, the steering gear of the rearview mirror, and the electric folding mechanism, the working environment and force of these lubrication points are basically the same, so the requirements for grease are basically the same.

It is generally recommended to use general automotive lithium-based grease for general automotive grease, which is suitable for use at various friction points of general automobiles. Wheel bearings are the main grease parts, and 2 grease (southern) is used throughout the year, or 1 grease is used in winter, and 2 grease is used in summer (north). Many users are accustomed to using 3 grease all year round, the consistency of the grease is too large, which will increase the rotational resistance of the hub bearing, and 3 grease is only suitable for use on tropical heavy-duty vehicles.

Wheel bearing grease must be replaced before it can be used until it is severely depleted, stratified or softened, and it is common practice to change the grease during secondary maintenance. When changing the grease, it should be filled reasonably, and no-load lubrication should be used as much as possible.

In addition to the hub bearing, for the lubrication of other parts, the amount of grease should also be appropriate, not the fuller the better. Generally speaking, it is advisable to install only 1 2 2 3 of the free space. For parts with large loads and low sliding speeds, such as automobile leaf springs, graphite calcium-based grease can be used, and graphite is not easy to extrude from the friction surface as a solid lubricant, which can play a long-lasting lubricating role.

Fill grease into each lubrication point in a timely manner according to the provisions of the instruction manual. It is required to inject grease into the water pump bearing, clutch pedal shaft, brake pedal shaft, transmission shaft, front and rear leaf spring pins, steering knuckle kingpins, steering horizontal tie rods, etc. every 20,000km. Try to avoid mixing different greases.

Due to the different chemical composition and properties of various greases, when mixed together, there may be negative effects such as increased oil separation and decreased dropping point.

Even if it is the same type, because the old grease contains a lot of organic acids and impurities, if mixed with the new grease will accelerate its oxidative deterioration. Therefore, when changing the grease, the old grease on the parts must be cleaned and new grease must be added.

It is mainly used in the movable joint part and the wheel shaft part, and what to use should be determined according to the position, and the manual shall prevail.

Automotive Directional Bearing Grease: Formulated with high viscosity index synthetic oil and lithium complex soap base, advanced additives to provide high temperature oxidation resistance, and other additives to improve the oxidation, wear and corrosion resistance of the grease. It is especially suitable for various gears used under high temperature and high speed conditions.

Bearing grease features:

1.Excellent mechanical stability Consistency levels remain stable for long periods of time under severe vibration conditions.

2.Enhanced extreme pressure performance Excellent load-bearing capacity.

3.Good waterproof performance Even in the presence of large amounts of water, it ensures long-term effective protection of the equipment.

4.High dropping point at high temperatures, long service life.

1.The parts that need to be lubricated are: sunroof, door hinge, window lifting system, lock linkage mechanism, car seat slide, steering ball joint, front arm ball joint, transmission shaft, mechanical axle pin, steel plate axle pin, etc.

2.Automotive lubricant additives are one or several compounds added to lubricating oil to obtain certain new properties of a lubricant or to improve some existing properties of a lubricant.

3.Additives mainly include antioxidants, anti-wear agents, friction modifiers, extreme pressure additives, detergents, dispersants, foam inhibitors, corrosion inhibitors, flow point improvers, viscosity index improvers, etc. They have four major functions: cooling, lubrication, cleaning and sealing, which play a vital role in ensuring the normal operation of the engine.

1. Spindle and bearing.

There is a rapid relative slip between the piston and the cylinder, between the spindle and the pad, and to prevent the parts from wearing out too quickly, an oil film needs to be created between the two sliding surfaces. An oil film of sufficient thickness separates the surface of the relatively sliding part to reduce wear.

2. an engine.

The oil has a low specific calorific value and is not inherently coolant inside the engine. However, due to the heat generated by fuel combustion in the engine, when the engine is working, the oil can bring the heat back to the oil tank and then dissipate it into the air to help the water tank cool the engine, and the real cooling effect is the water (or antifreeze liquid) outside the engine case.

3. a piston ring.

The oil creates a seal between the piston ring and the piston to reduce gas leakage and prevent outside contaminants from entering.

Engine oil: mainly used in automobile engines, automobile rear axles, manual transmissions, etc.;

Brake fluid: used in the braking system of automobiles;

Automatic transmission fluid: used in automobile automatic transmission device;

Grease: used for lubrication and sealing of automobile bearings;

Automobile lubricant is a liquid lubricant used in various types of machinery to reduce friction and protect machinery and processed parts, mainly playing the functions of lubrication, cooling, rust prevention, cleaning, sealing and buffering.

The concept of automotive lubricant additives is to add one or several compounds to a lubricant in order to obtain some new properties of the lubricant or improve some of the properties already in the lubricant. Additives are mainly divided into antioxidants, anti-wear agents, friction modifiers (also known as oily agents), extreme pressure additives, detergents, dispersants, foam inhibitors, anti-corrosion and rust inhibitors, flow point improvers, viscosity index enhancers and other types. The additives sold in the market are generally a combination of the above single additives, the difference is that the composition of a single additive is different and the proportion of several single additives within the compound additive is different.

Well, how to say it, lubricating oil covers too wide ......Engine (engine oil), transmission (gear oil), ground (butter), automatic transmission (ATF oil) can all be called lubricating oils......

In addition to engine oil, gearbox oil, and brake oil, there is also a very important lubricating oil in the car, that is, the refrigeration oil of the air conditioning system. Refrigeration oil works at -20-70 degrees, the working environment is harsh, and it is easy to age, so it needs to be replaced regularly.

Automobile lubricating materials mainly include lubricating oil, gear oil and grease, according to the different working characteristics of each friction pair of the engine, the corresponding lubrication methods and lubricating materials are selected. How to choose the grease for different parts of the car for friction pairs that carry large loads and are inconvenient to set up oil pools, such as wheel bearings in automobile chassis?

The parts and components used in the assembly grease in automobiles are mainly the following parts:

1. Body parts: door system, sunroof system, airbag, rearview mirror, door lock system, control cable, interior parts, seat system, bolts and fasteners;

2. Chassis and brake system: chassis and brake system;

3. Electrical components: connectors, relay switches, accessories, ignition systems and lighting;

4. Fuel and air system: fuel and air system;

5. Power system components: assembly accessories, cooling and air control systems, engine coatings, clutches, cover gasket seals and transmission and transmission systems.

Generally speaking, the grease used in the automotive industry has high requirements, which is mainly determined by the characteristics of its use

1. Lifetime lubrication requirements, there is no possibility of adding and maintaining grease in the middle, which requires a long life of grease;

2. Compatibility with plastics, because there are many plastic parts in the car, it must be required that the grease used for assembly cannot react with the plastic parts;

3. Reduce noise, now cars pay more attention to comfort, so the requirements for noise are relatively high, which requires the grease used for assembly to provide these functions.

Lubricating grease for automobile parts is a long-life high-temperature grease made of composite soap thickened synthetic base oil, and added with anti-wear, anti-oxidation, anti-rust and structural improvers. It has excellent water resistance, and is not easy to emulsify and lose when exposed to water; It has excellent high and low temperature performance and oxidation stability to ensure the long-term normal operation of the lubricated part in the high and low temperature environment; It has excellent anti-rust performance and effectively prevents the rust of mechanical parts; Good mechanical stability and colloidal stability ensure that the product adheres to the lubricated parts normally without loss; It has excellent extreme pressure anti-wear performance, which effectively reduces the wear of bearings.

The main role of grease is to lubricate, protect and seal.

1. The types and grades of automotive grease can be divided into soap-based grease and non-soap-based grease according to their composition. Soap-based grease is commonly used in automobiles, mainly calcium-based grease (commonly known as "butter"), sodium-based grease, automotive general resonance grease, etc.

Calcium-based grease, commonly known as "butter", its main characteristics are good water resistance, poor temperature resistance, suitable for lubrication in wet or easy to contact with water and low temperature of friction parts, such as the automobile chassis can not use lubricating oil at various friction points, etc., the use temperature range is 10-60 degrees Celsius.

The characteristics of sodium-based grease are high temperature resistance, but it is very water resistant, so it can not be used for wet and friction parts that are easy to contact with water, and can only be used for parts that are very close to the engine, high temperature, and not easy to contact with water, such as fans, clutches and other parts, and the use temperature does not exceed 110 degrees Celsius.

Kennels grease is a multi-purpose, multi-effect grease, which has the common advantages of other greases, but also has good anti-friction properties, its dropping point is high, and can be used at high temperatures above 100 degrees Celsius.

2. Correct selection of automotive grease.

According to the requirements of different parts, the appropriate grease should be selected. In general, the type and brand of grease used should be selected according to the provisions in the automobile instruction manual.

Choose the right grease according to the working conditions and usage conditions of the friction parts of the machinery and equipment where grease is used.

The amount of grease filled has a close relationship with the consumption of mechanical lubrication and grease, and the overfilling of grease in the bearing will increase the friction torque of the bearing, cause the temperature rise of the bearing to be too high, and lead to the loss of grease: if the filling amount is insufficient or too small, dry friction may occur and damage the bearing. General sealed bearing, the filling of grease 11 to bearing inner cavity 1 3 - 2 3 is appropriate; The upper end of the rolling bearing should be filled with the 1 2 of the bearing cavity, and the lower end is filled with the 1 3-3 4 of the cavity; Bearings working in polluted environments and bearings running at low and medium speeds should fill all cavities.

Different greases cannot be mixed with each other at will, because the chemical composition and properties of greases are different, which will affect the stability and performance of greases after mixing.

According to the displacement, which level of engine oil is suitable for the car.

For cars, it is recommended to choose SG or higher oil for cars with a displacement of less than 1 liter. For cars with a displacement of more than 1 liter, it is recommended to use lubricating oil of SH grade or higher. For cars with a displacement of more than 1 8 liters, it is recommended to use SJ and SL level lubricating oil, and the unified classic pure synthetic engine oil APISL SJ5W 40 lubricating oil that is universal in all seasons is a good choice.

The hot summer is coming, and finally how to choose and change engine oil in summer?

1. Pay attention to the engine's oil warning light or oil pressure gauge, if the oil light is on, stop immediately, and do not continue to drive to prevent serious accidents. After stopping, first check whether the oil volume is enough (the oil level is between the min and max scale marks of the oil dipstick), if the oil volume is not enough, it should be filled.

2 Choice of oil. Pay attention to the viscosity of the oil when choosing a motor oil in summer, and try to choose an oil with a higher viscosity level, such as W 50, etc. Because the viscosity of the lubricating oil changes with the increase of temperature, that is, the viscosity of the lubricating oil decreases when heated, the oxidation resistance becomes poor, it is easy to deteriorate, and even causes failures such as burning tiles and holding shafts.

Therefore, the crankcase and gearbox should be replaced with a more viscous summer lubricating oil, and the amount and quality of the lubricating oil should be checked frequently, and replaced in time.

3 The engine of a long-distance car (especially an overloaded vehicle) is prone to high temperature in summer, so pay attention to the engine's water temperature gauge or oil temperature gauge, oil warning lamp, and oil pressure gauge. If the oil light is on or the oil pressure is not within the normal range, especially when the water temperature and oil temperature are too high, stop immediately and wait for the engine temperature to drop before driving.

4 Vehicles that often drive on mountain roads and roads with poor road conditions are also prone to cause engine temperature to rise, and the viscosity of the vehicle in this case should also be a little higher when choosing engine oil, such as W 50.

5. During the run-in period of summer overhaul vehicles or new cars, do not add high-viscosity lubricating oil, and choose 40 or 15w 40 lubricating oil (in addition, be cautious about using things such as repair agents or engine oil) to prevent the occurrence of shaft burning tile accidents.