German LIEDTKE brake LIEDTKE model LIEDTKE price

LIEDTKE brakes, also known as disc brakes, pneumatic brakes, air-operated disc brakes, and air-hydraulic pneumatic brakes, are a type of industrial drive brake. They are actuators that use air pressure to stop or decelerate moving parts in machinery. The structure is simple, installation is convenient, and they are resistant to damage, pressure, drops, and impacts, offering a long service life. Generally, only the brake pads need to be replaced, which is easy and convenient. They utilize magnetic effects.

LIEDTKE brake classification

Classification by braking energy source: Service braking systems can be divided into manual braking systems, where the driver's body serves as the sole braking energy source; power braking systems, which rely entirely on potential energy in the form of air pressure or hydraulic pressure converted from engine power (the braking source can be an engine-driven air compressor or oil pump); and servo braking systems, which use both manual and engine power for braking. Parking braking systems can be manual or power-assisted. Inertia braking systems and gravity braking systems are specifically used for trailers. According to the transmission method of braking energy, braking systems can be divided into mechanical, hydraulic, pneumatic, and electromagnetic types. Braking systems that simultaneously employ more than two energy transmission methods are called combined braking systems.

LIEDTKE brake mechanism

Depending on the installation position on the vehicle, parking brake devices are divided into central parking brake devices and wheel parking brake devices. The former, with the brake installed on the drive shaft, is called a central brake; the latter shares a set of brakes with the service braking device, featuring a simple and compact structure that has been widely adopted in passenger cars. This type of brake combines a disc brake for service braking and a drum brake for parking. The outer rim of the dual-action brake disc serves as the disc for the disc brake, while the central drum section acts as the drum for the drum brake. To apply the parking brake, pull the manual parking brake lever in the cab to the braking position. Through a series of levers and cables, the lower end of the parking brake lever is pulled forward, causing it to rotate around a flat-head pin. Its intermediate pivot pushes the brake pushrod to the left, pressing the front brake shoe against the brake drum. Once the front brake shoe presses against the brake drum, the pushrod stops moving, and the brake lever continues to rotate around the intermediate pivot. Consequently, the upper end of the brake lever moves to the right, pressing the rear brake shoe against the brake drum to apply the parking brake. To release the brake, return the parking brake lever to the non-braking position. The brake lever returns under the action of the cable return spring, while the brake shoe return springs pull the two brake shoes back.

LIEDTKE brake hydraulic unit

Passenger car service braking systems all adopt hydraulic transmission devices, mainly consisting of the master cylinder (main brake cylinder), hydraulic lines, wheel cylinders (slave cylinders) in the rear wheel drum brakes, and hydraulic calipers in the front wheel disc brakes, as shown in the figure on the right. In addition to metal pipes (copper pipes), specially formulated rubber brake hoses are used for the connecting oil lines between the master cylinder and wheel cylinders. Various pipe fittings are used between hydraulic components and sections of oil lines. Before braking, the hydraulic system is filled with specially formulated brake fluid. When the brake pedal 4 is pressed, the master cylinder 5 forces brake fluid into the wheel cylinders 6 and brake calipers 2, pushing the brake blocks against the brake drums and discs. The hydraulic pressure and pedal force continue to increase until full braking is achieved, starting when the brake clearance is eliminated and braking torque begins to generate. During this process, due to elastic expansion deformation of the oil lines under hydraulic pressure and elastic compression deformation of friction elements, the pedal and wheel cylinder pistons can continue to move a certain distance. Upon releasing the pedal, the brake shoes and wheel cylinder pistons return to their original positions under the action of return springs, forcing the brake fluid back into the master cylinder.

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