Bus Brake Linings
Buses is any type of motor vehicle used for transporting goods or
paying passengers. Baiyun develops and manufactures drum brake
linings for buses including truck & bus which require powerful
braking force.
For large buses, strong braking forces are required. To this end,
drum brakes linings are widely used because they are more
lightweight and costs less that disc brakes, while capable of
delivering more braking force.
Drum Brake Linings for Buses
Drum brake is a brake that uses friction caused by a set of shoes
or pads that press outward against a rotating cylinder-shaped part
called a brake drum. Drum braking linings have brake drums that
rotate with the wheels.
Brake shoes fitted with drum brake linings (friction material)
which press against the drums from the inside to generate braking
force (decelerate and stop) are set inside of the drums.
With this system, friction is generated by pressing the brake
linings against the inside surfaces of the drums. This friction
converts kinetic energy into thermal energy. Drum rotation helps to
press the shoes and the lining against the drum with more force,
offering superior braking force in comparison with disc brakes. On
the other hand, it is very important to design the components so
that the heat from the thermal energy is dissipated efficiently
into the atmosphere.
There are three types of drum brakes depending on how the brake
shoes are pressed on to the drums; leading/trailing shoe type, twin
leading shoe type and duo-servo type.
Structure of drum brakes
Drum brakes are a brake system with brake drums (rotor) which
rotate with the wheels. Inside each drum are brake shoes fitted
with brake linings (friction material). Pistons (pressure
mechanism) press against the drums from the inside to generate
braking force, thus making is possible to decelerate and stop the
vehicle.
How drum brakes work
When the driver steps on the brake pedal, the power is amplified by
the brake booster (servo system) and changed into hydraulic
pressure (oil-pressure) by the master cylinder. The pressure
reaches the brakes on the wheels via tubing filled with brake oil
(brake fluid). The delivered pressure pushes the pistons on the
brakes of the four wheels. The pistons press the brake linings,
which are friction materials, against the inside surfaces of the
brake drums which rotate with the wheels. The linings are pressed
on the rotating drums, which in turn decelerate the wheels, thereby
slowing down and stopping the vehicle.
Main components of drum brakes
Friction Materials
1, Friction Raw Material
2,Types of friction materials
*1 Sintered alloy: The phenomena where the particles of powder
material join together and turns into a solid substance by
pressurizing and fabricating the powder material and heating it at
temperatures below the melting point. Material that is not made by
melting metal, but instead by sintering metal powders is called
sintered alloy.
*2 C/C composite: Carbon fiber reinforced carbon composite. Carbon
composite material has been strengthened with carbon fiber. It is
extremely thermally stable and lightweight. This material is often
used for brake rotors and brake pads for aircraft and racing cars.
3, Friction Material of Baiyun
4, Manufacturing process of friction materials
Producing Equipment
R & D Units
