Guangzhou Yuanxing Industrial Co., Ltd. |
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Car Front Brake Parts 390*36mm Flower Disc Full Floating Center Bell
Product parameter
Product Name | Car brake disc and bell |
Disc size | 390*36mm |
Bell type | Full Floating |
Fit For | 21 Inch Wheel |
Quality | 100% Tested |
Application | Auto Brake Part |
Full set included | 1 pair brake disc /1 pair bell / 1 set bolts |
product description
There are disc brakes, drum brakes, and air brakes. Older cars have
front and rear drums. Many cars have disc brakes both front and
rear. Because disc brakes have better heat dissipation than drum
brakes, they are not prone to thermal decay under high-speed
braking, so their high-speed braking effect is good. But at low
speed cold brakes, the braking effect is not as good as drum
brakes. The price is more expensive than the drum brake. Therefore,
many mid-to-high-end cars use full-disc brakes, while ordinary cars
use front and rear drums, while trucks and buses that require
relatively low speeds and require large braking power still use
drum brakes.
Drum brakes are sealed and shaped like drums. There are also many
brake pots in China. It turns when driving. Two curved or
semicircular brake shoes are fixed inside the drum brake. When the
brakes are stepped on, the two brake shoes are stretched out under
the action of the brake wheel cylinder, supporting the brake shoes
to rub against the inner wall of the brake drum to slow down or
stop.
Material requirements
The material of the brake disc adopts my country's gray cast iron
250 standard, referred to as HT250, which is equivalent to the
American G3000 standard. The requirements for the three main
elements of the chemical composition are: C: 3.1∽3.4 Si: 1.9∽2.3
Mn: 0.6∽0.9. Mechanical performance requirements: tensile
strength>=206MPa, bending strength>=1000MPa,
deflection>=5.1mm, hardness requirements between: 187∽241HBS. .
nickname
In English, brake discs are usually represented by: BRAKE DISC or
BRAKE ROTORS, and brake drums are represented by: BRAKE DRUM. In
addition, brake discs are also called brake discs and brake discs
in southern my country. In fact, they all refer to one thing.
Origin distribution
Brake discs are cast products. Due to the influence of climatic
factors, the north is too cold and the south is too hot, so most of
the production bases of brake discs are located in Shandong, Hebei,
and Shanxi, especially in the brake disc industry in Laizhou and
Longkou, Shandong. It was the first to start with many
manufacturers.
Disc brake discs (discs) are divided into solid discs (single
discs) and duct discs (double discs). The solid disc is easier for
us to understand. To put it bluntly, it is solid. Vented Disc, as
the name implies, has a ventilation effect. From the outside, it
has many holes on the circumference that lead to the center of the
circle, called air ducts. When the car is in motion, the air
convection through the air duct can achieve the purpose of heat
dissipation, which is much better than the solid heat dissipation
effect. Most cars are front-drive, and the frequency meter of the
front disc is worn out, so the front air duct disc and the rear
solid disc (single disc) are used. Of course, there are also wind
tunnels before and after, but the manufacturing cost is not too
bad.
In addition, there is a disc that integrates HUB, ABS rings,
assembly bolts, bearing skins, etc., which are generally called
bearing discs and are used in larger vehicles such as trucks.
Drum brakes have a cast iron shaped like a tambourine, called a
brake drum, which is fixed to the tire and rotates at the same
speed. Disc brakes have better reactivity and stability, better
heat dissipation, and easy replacement. Drum brakes are lower in
cost and higher in absolute braking power, and are more commonly
used on the rear wheels of small cars. But its abrasion rate is
higher, so the overall cost is higher at the same time.
reference picture