German DANFOSS brake DANFOSS model DANFOSS price

DANFOSS brakes are the actuating components in the entire braking system. Electromagnetic brakes are installed on trailer wheels. Their structure is shown in Figure 1. The entire brake assembly mainly consists of components such as the electromagnet, lever drive mechanism, front and rear brake shoes, backing plate, and friction ring. These are mechanical parts that stop or decelerate moving parts in machinery, commonly known as brakes. Brakes mainly consist of a brake frame, braking elements, and operating devices. Some brakes are also equipped with automatic adjustment devices for braking element clearance. To reduce braking torque and structural dimensions, brakes are usually installed on the high-speed shaft of the equipment, but for large equipment with high safety requirements (such as mine hoists, elevators, etc.), they should be installed on the low-speed shaft near the working part of the equipment.

DANFOSS brake classification

Classified by braking energy source, service braking systems can be divided into: braking systems that use the driver's physical effort as the sole braking energy source are called manual braking systems; those that rely entirely on potential energy in pneumatic or hydraulic form converted from engine power are called power braking systems, where the braking source can be an engine-driven air compressor or oil pump; braking systems that use both manual effort and engine power are called servo braking systems. 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 adopt more than two energy transmission methods can be called combined braking systems.

DANFOSS 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's brakes are installed on the propeller shaft and are called central brakes; the latter shares a set of brakes with the service braking device, featuring a simple and compact structure, and has been widely applied in passenger cars. This type of brake combines a disc brake serving as the service brake and a drum brake serving as the parking brake. The outer rim of the dual-action brake disc serves as the brake disc for the disc brake, while the central drum section serves as the brake drum for the drum brake. When applying the parking brake, pull the manual parking brake lever in the cab to the braking position. Through a series of levers and cable transmissions, the lower end of the parking brake lever is pulled forward, causing it to rotate around the flat-head pin. Its intermediate pivot pushes the brake pushrod to the left, pressing the front brake shoe against the brake drum. After 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, push the parking brake lever back to the non-braking position. The brake lever returns under the action of the return spring wound on the cable, while the brake shoe return springs pull the two brake shoes together.

DANFOSS brake hydraulic device

Passenger car service braking systems all adopt hydraulic transmission devices, mainly consisting of the master cylinder (main brake pump), hydraulic lines, wheel cylinders (slave brake pumps) in the rear wheel drum brakes, and hydraulic cylinders in the front wheel caliper disc brakes, as shown in the figure on the right. In addition to metal pipes (copper pipes), specially made rubber brake hoses are used for the connecting oil pipes between the master cylinder and wheel cylinders. There are various pipe fittings between hydraulic components and between sections of oil pipes. 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 can continue to increase until full braking is achieved only after the brake clearance is eliminated and braking torque begins to generate. During this process, due to the elastic expansion deformation of the oil pipes under hydraulic pressure and the elastic compression deformation of the friction elements, the pedal and wheel cylinder pistons can continue to move a certain distance. Releasing the pedal allows the brake shoes and wheel cylinder pistons to return to their original positions under the action of return springs, forcing the brake fluid back into the master cylinder.

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