Although the drum brakes were invented long before modern disk, they still remain relevant for manufacturers and car owners.Such popularity has been won at the expense of ease of construction.Drum brake much easier, and, respectively, and reliable, and unpretentious disc brakes.
production history
And they were invented back in the 19th century.The first prototype of the modern brakes were primitive system of only three components.It was actually a brake drum fixed to the wheel, durable and flexible tape located around it, as well as a lever spanning the last detail.Naturally, the service life of the system was short-lived, besides it got various stones and dirt.
improve the design until the early 20th century.Then the engineer Louis Renault invented a new brake drum with more reliable components.For the first time it included pads located inside the mechanism.The braking device is well protected from dirt, and therefore its lifetime has increased significantly.
Since the brake drum has repeatedly changed its design and materials, but its function remained unchanged.Such an arrangement still reduces the speed of the car if necessary.It also served as the handbrake.
What is the modern drum brake disc?
front and rear drums are made entirely of stainless steel and ductile iron.Ready element output grind the inner side and is mounted on the vehicle.Detail is mounted on the support shaft or on a wheel hub.
addition to the design of the brake drum consists of the following elements:
- Brake pads with special friction material composition (each manufacturer keeps a secret method of manufacture).
- hydraulic cylinder (there may be a few pieces).
- Protective disc.
- Special retainer.
- return spring.
- samopodvoda mechanism.
- drum tower.
- mechanism supply pads.
How does a brake drum?
The principle of this mechanism is as follows.The driver at the brake pedal creates a certain pressure in the working fluid.It in turn acts upon the piston cylinder.After overcoming the return spring forces the last element actuates the brake shoe, diverging sides and closely adjacent the surface of the drum.Consequently, the speed of rotation of parts is greatly reduced, and with the vehicle speed decreases.
Conclusion As you can see, part of the design of the brake drum really changed much in over 100 years of existence.All technologies used today and provide the car as soon as the braking distance on any road surface.On the effectiveness of a single step, they are not inferior to their competitors - disk systems.Therefore, drum brakes are still in high demand among motorists, but in recent years, many motor companies refuse to complement their cars with such devices, preferring disk.
