1
mode of action
by the brake drum and the brake shoe composition. When braking, the brake shoe round flared outwardly, friction with the inner surface of the rotating wheel brake drum forces the brake drum and the wheel deceleration until it stops rotating.
2
advantages
– from the drum brake has a good brake effect, forceful, general large vehicles still use drum brakes.
– lower cost, the first drum brake for braking systems, manufactured at a low technical level.
3
is less than
· brakes (Brake Lining) sealed within the brake drum, produced by wear pieces chip can affect the contact surface thereby affecting the braking performance.
· relatively poor thermal performance, the brake shoe and the brake drum in the high temperatures generated during braking complex prone to deformation, causing brake fading phenomenon shaking and vibration, will cause decreased braking efficiency.
· brake clearance should be adjusted, and more sealing parts, so that maintenance is not easy.
4
You know what?
· Today, most family cars have been popular for the front and rear disc brakes, only a small part of the family cars still use Qianpanhougu brakes.
5
technical principle
works drum brakes can be the very image of a cup to describe. Brake drums like a cup, when you rotate five fingers into the cup, finger is the brake pads, as long as your fingers will be out one, rubbing the inner wall of the cup, the cup will stop rotating.
The drum brake on the vehicle by the brake is simply put pumps, pistons, brake pads and the drum composition, pushed by the high pressure during braking of brake fluid in the brake cylinder piston, made of two half-moon movable shoe apply a force, press it against the inner wall of tympanic, frictionally prevent rotation of the brake drum so as to achieve a braking effect.
6
Further reading
braking mechanism from 1890 began to develop in the UK, and in patented in 1902 in Birmingham, and mass production.
is definitely the most original drum brake, but not now drum, he was fixed in the car by using a mechanism of wood and wood controlled to achieve the reduction of the grinding wheel outside, later found that the wheels outer wear big, think multi-lap welding as a special hoops on the inside brake, with the development of the automobile industry, to improve the braking performance, drum brakes appeared. After the discovery after braking force is not enough, they came up with a one-way and two-way self-energizing self-energizing, ensure the car has sufficient braking performance, but these problems are solved, new problems have emerged. When the vehicle wading drum brakes appeared drawbacks.
The hands then dragging state when something is derived from a disc brake caliper, which solves the problem wading, but this brake the braking force is not in the form of a drum system strong dynamic, and more complex structures, relatively high cost, mainly used in light vehicles, heavy vehicles mainly drum, a few truck front axle is in the form of a disc brake.