Your friction plate quality, what is the friction coefficient of friction plate?

The friction parts are discs, which are divided into single discs and multi-discs, and are divided into dry and wet types. The single-disc structure is simple, there is only a pair of friction surfaces, the inertia of the driven part is very small, the heat dissipation is good, the adjustment is convenient, and the separation is thorough, but the torque that can be transmitted is small, generally not more than 1000 Nm. The multi-disc type has multiple pairs of friction surfaces and can transmit torque up to 8 106 Nm.

If large torque transmission is required, the number of friction faces can be increased without increasing the radial size and axial compression force of the clutch, which is conducive to reducing the moment of inertia of the clutch. The multi-disc type is compact in structure, can use friction surfaces of different materials, is easy to manufacture, install and adjust, allows bonding at variable speeds, and has a wide range of applications; However, too many friction surfaces will affect the clutch flexibility, and even after removing the compression force, the main and slave friction parts can still not be completely disengaged, resulting in excessive wear of the friction surface. Usually there should be less than 15 pairs of friction surfaces for dry type and less than 30 pairs for wet type.

The friction parts of the wet friction clutch are immersed in oil to work, often multi-disc type, which is less wear than dry type, good heat dissipation, low temperature rise, long life, and large torque that can be transmitted. The friction part is a truncated cone, which is divided into two types: single cone and double cone. This kind of clutch has a simple structure, smooth engagement and thorough separation; It can produce a large friction force, and the friction surface generally does not need to be manually adjusted after wearing, because the single cone type has only one pair of cone friction surfaces, and the double cone type also has only two pairs of friction surfaces, if you want to transmit large torque, you must increase the radial size of the cone.

Reducing the cone angle increases friction, but the inner and outer cone surfaces are not easily separated. Generally, when the friction surface material is metal-metal, the half-angle of the cone top should not be less than 7°; When it is leather-metal, it should not be less than 12°.

Answer: According to the exclusive research and development of friction material formula, production management system, and unique processing technology to judge. The characteristics of the three-point friction plate are obtained:

1. Exclusive research and development of friction material formula.

High-quality friction plate manufacturers have their own friction material research institute, has been committed to the development and research of friction material formulas, has several sets of friction material formulas, according to the characteristics of customers and product requirements, targeted development, improve the high temperature resistance, friction coefficient and torque of friction plates.

2. Production management system.

Regardless of product grade, the products in the supporting market and the maintenance market implement a unified TS16949 quality management system, and the host market and the aftermarket implement a unified friction material formula to ensure that the quality of high-quality friction products is always unified and leading the industry.

3. Unique processing technology.

The high-quality friction plate is different from other different friction plate brands with many different processing technologies, and the product quality is strictly controlled to ensure that the high-quality friction products have a more stable friction coefficient under high temperature conditions.

In the manufacture of friction materials, the basic task that needs to be solved is to ensure that a large amount of energy in the friction parts can be converted into heat energy as much as possible in a short time, and at the same time to ensure that the friction materials are braked many times without major damage to the friction parts, and to ensure that there is a suitable service life and smoothness of work.

When the friction device is determined, the basic requirements for the friction material of such a device are determined. These basic requirements are briefly described below:

The friction material should achieve the necessary and stable coefficient of friction. Generally, the limited value of the friction coefficient of the friction pair, including the upper and lower limits, is about between, and the calculated value of the friction coefficient of the general automobile brake and clutch design is; The calculated value of the coefficient of friction of the design of the construction machinery brake and clutch is between.

The stability of the friction coefficient is very important, when the friction working conditions change, such as the change of speed, pressure, temperature, environmental medium, etc., the change of friction torque will cause the change of friction torque.

It is generally believed that the fluctuation value of the friction coefficient should not exceed 15% during a braking cycle or in the long-term working process of the friction pair; Another indicator is the stability of the coefficient of friction, the fluctuation of which should ideally not exceed 10%.

Friction material is a component material applied in power machinery and relies on friction to perform braking and transmission functions. It mainly includes brake linings (brake pads) and clutch faces (clutch pads). Brake pads are used for braking, and clutch pads are used for transmission.

Generally, the basic requirements for brake pads mainly include wear resistance, high friction coefficient and excellent thermal insulation performance. According to the asbestos-free organic brake material, it is mainly developed as a substitute crystal for asbestos, and is used for brake drums or brake shoes. Any mechanical device and a variety of vehicles in motion must have brakes or transmissions.

Friction materials are a key component in such brakes or transmissions. Its primary function is to absorb or transmit power through friction. For example, the clutch pads transmit power, and the brake pads absorb kinetic energy.

They enable machinery and equipment to work safely and reliably with all kinds of motor vehicles. Therefore, friction material is a widely used and critical material.

Friction material is a kind of polymer ternary composite material, which is a physical and chemical complex. It is a product made of three categories of polymer binders (resin and rubber), reinforcing fibers and friction performance modifiers and other compounding agents, through a series of production and processing. Friction materials are characterized by good friction coefficient and wear resistance, as well as certain heat resistance and mechanical strength, which can meet the performance requirements of vehicle or machinery transmission and braking.

They are widely used in automobiles, trains, aircraft, oil drilling rigs and other types of construction machinery and equipment. Civilian products such as bicycles and washing machines are indispensable materials for power transmission or braking and deceleration.

Friction plates have 3 basic requirements in terms of performance:

1 Appropriate coefficient of friction: The coefficient of friction is the basic parameter of the friction material, which determines the basic braking torque of the brake pad. The national standard strictly requires manufacturers to indicate the coefficient of friction on the packaging.

The coefficient of friction must be appropriate, too high can cause wheel locking, loss of direction and burnout during braking, and too low a braking distance is too long.

2 Reliable safety: Brake pads produce instantaneous high temperatures when braking, especially at high speeds or when braking in an emergency. At high temperatures, the coefficient of friction of the friction plate decreases, which is called thermal decay. The level of thermal decay determines the safety of high temperature conditions and emergency braking.

3. Satisfactory comfort: Comfort is the direct embodiment of friction performance, including braking feeling, noise, dust, smoke, odor, etc. With the increase of private cars and the improvement of people's living standards, comfort has increasingly become an important indicator of friction plates under the basic premise of meeting safety.

1. The dynamic friction coefficient is too small, and the clutch slips and ablates during the bonding process. If the static friction coefficient is too low, the clutch will slip, and if it is too high, it will not play an overload protection role.

2. The heat capacity of the friction plate of the brake motor is too small and cannot effectively absorb and dissipate heat energy. This leads to attenuation of frictional properties. The aluminum core board is too thin, which also affects the absorption of heat energy and the torsion strength, endangering personal safety.

3. The bonding performance of the aluminum core plate of the friction plate of the brake motor friction plate and the friction material, and the local shedding of the friction material lead to the failure of the friction plate of the brake motor.

4. The wear of the friction-based material on the aluminum disc is too large, which makes the positive pressure of the spring drop and the output torque attenuates in advance.

5. When the cold machine starts, the friction plate is bonded, and the main Shenfeng volt is too large if the proportion of rubber in the friction material is too large, resulting in adsorption bonding, and at the same time, high-frequency "stick-slip" noise will be generated.

6. After the oil expansion test, the friction plate does not expand but shrinks, indicating that the friction plate has deteriorated.

Cylinder block and friction plate products can be divided into asbestos friction materials and asbestos-free friction materials according to the product material.

1. Asbestos friction materials are divided into the following categories:

1. Asbestos fiber friction material, also known as asbestos friction material.

2.Asbestos linear friction material.

3.Asbestos friction material.

4.Asbestos woven friction material.

Two. Asbestos-free friction materials are divided into the following categories:

1.Semi-metallic friction materials. Disc brake pads are used for automobiles and heavy vehicles. Material formulations typically contain about 30 to 50 percent ferrous metals. Semi-metallic friction materials get their name from this. It was the first asbestos-free material developed to replace asbestos.

2.Friction materials. In a broad sense, it refers to non-asbestos and non-steel fiber friction materials. However, existing disc friction materials also contain small amounts of steel fibers. In most cases, the base material of the NAO friction material is a mixture of two or more fibers.

3.Powder metallurgy friction materials. Also known as sintered friction material, it is made by mixing, pressing, and sintering iron-based and copper-based powder materials. Suitable for braking and transmission conditions with high temperatures.

4.Carbon fiber friction material. It is a friction material with carbon fiber as the reinforcing material. Carbon fiber has the characteristics of high modulus, good thermal conductivity and heat resistance. Carbon fiber friction materials are the best performing among all kinds of friction materials. Millions of car purchase subsidies.