The application of disc brakes in
the car, due to the restrictions on the size of the shape of the wheel
hub, in small car hydraulic disc brake is used in great quantities, and
heavy vehicle is using a pneumatic disc brake. With the development of
automobile industry technology in China, especially the development of
car industry, the phenomenon of using disc brakes on the car will be
gradually into a scale. Especially in improving the vehicle performance,
safety, comfort, and meet the demand of people constantly improve the
living material, improve the living environment plays a major role.
4.1 minivans, cars, light trucks and other vehicles
Sedan
in the braking process, due to inertia effect, the front wheel load
often account for 70% of the motor full load – 80%, so the front wheel
braking force is bigger than the rear wheels. Manufacturer from the
perspective of economic and practical, in order to save costs, many used
the front disc brake, the rear drum brake
mixed matching method. Adopts front coil HouGu type hybrid brake is
also because the vehicle during emergency braking, axle weight forward,
higher requirement on the front wheel braking performance, brake before
this class mainly hydraulic disc brake for the mainstream, with
hydraulic oil as a transmission medium, with total hydraulic pump as
power, after the brake pump with hydraulic points double-acting cylinder
brake shoe to match. At present most of the cars, minivans, light
trucks, suvs and pickups are using front coil HouGu mixed type brake.
But with the improvement of highway grade, ride quality rise, especially
the national security law enforcement, used disc brakes front and rear
wheels will be an inevitable trend of the development of.
4.2 large passenger cars
Disc
brake products, technology advanced, reliability, overall good,
innovative and integration of technical standards. The European and
American countries since the early 1990 s the disc brake for large
buses. To 2000, the disc brake (both front and rear brake disc) has
become the standard of European and American countries city bus
configuration. Since 1997 in our country on the bus and truck promotion
disc brakes and ABS anti-lock braking system, but the price is too high
for imported products, mainly used in high-end products. Force 2004, the
ministry of communications over 9 m high Ⅱ type passenger cars on the
“must” after equipped with disc brakes to be popular. Such as Beijing,
Shanghai, guangzhou, shenzhen, wuhan, the bus company are using matching
for coach in pneumatic disc brake. At present domestic well-known large manufacturers have been in mass production grade passenger with disc brakes.
4.3 heavy duty truck
As
a heavy duty truck industry applied new technology, disc brake is
already a mature product. Large domestic car factory are finished in the
early period of the disc brake in heavy duty truck type test and
technical reserves, the disc brake can become the future heavy card in
some ways the new trend in the development of brake system matching.
5. The domestic development trend of automotive disc brake
Europe,
America, Japan and other developed countries have disc brakes as
standard equipment in cars, buses, medium, and heavy multistage other
cars. Along with the national laws and regulations, such as GB 7258-2004
“motor vehicle safety technical conditions” (to be released based on
the 2004 version of the updated version) and GB 24407-2012 “special
school bus safety technical conditions”, is expected in the next few
years, disc brakes at home will get rapid promotion and application.
According to the new GB 7258, dangerous goods transport vehicle front
axle and conductor is more than 9 m of bus front axle should be equipped
with disc brake; The new GB 24407 requirements: dedicated school bus
front wheel should install the school bus brake discs. Modern car disc brake
problems should pay attention to the development of research and mainly
increase the efficiency of the brake’s braking, prevent dust pollution
and corrosion structure and reduce cost, weight, Jane, the development
of the electronic alarm and intelligent system, practical stronger and
longer life.
