More about spring brakes

There are several options for selecting a brake to manage unbalanced or vertical loads, ranging from basic locking mechanisms to electrically or pneumatically operated equipment. Electrically released brakes come in a variety of shapes and sizes. Some units are made to store loads for a short period. Others are intended to stop and hold the load and are built for reasonably high cycle rates. There are two types of brakes: spring-set/solenoid-released and spring-set/coil-released. The brakes act similarly in spring-set systems, whether solenoid or coil released: When there is no power, the friction disc is compressed against the housing by springs, keeping the load fixed.

Heavy vehicles and equipment use air brakes such as power set spring set brake used in heavy machinery. The brakes on a trailer can be connected to the control system in the cab via air brake systems. With a hydraulic system, this would be impossible to do. Air brakes are far easier to set up than hydraulic brakes, and utilizing air instead of hydraulic fluid eliminates several possible problems. Minor leaks in the brake lines, for example, will not result in the system failing, and air brakes can still work despite substantial leaks. Furthermore, the system will not run out of active braking material because the air supply is infinite.

Why spring brakes were invented

This sort of braking mechanism began as a precautionary measure. A truck that had lost air pressure due to a system or hose failure had no method of coming to a controlled halt before the advent of spring brakes. The use of spring brakes can assist in relieving this issue. The spring decompresses as the air pressure declines, giving the motorist enough time to come to a controlled stop. If the pressure falls below 60 pounds, an alarm will ring, alerting the driver to a possible hazard. The motorist will have more time to come to a safe and controlled halt due to this.

 How spring set brakes work

A magnetic field is formed when an electromagnetic coil is energized by DC electricity. When electrical current is provided to an electromagnet coil, the brake is released, allowing a linked shaft to rotate freely. When power is turned off, the brake engages and an associated shaft stops rotating. The magnetic force pulls an armature across a small air gap, compressing several springs installed in the magnet housing. The friction lining attached to a shaft hub is free to rotate when the armature is brought in flat against the magnet face.

Braking torque is formed by sandwiching the friction connecting the armature and a second friction surface. When the magnet’s power is turned off, the springs press against the core. Because the hub is splined to the friction lining, the shaft stops rotating until power is provided to the coil again. Elevators, escalators, wind turbines, cranes, servo motors, and other applications use spring-applied or spring-set brakes.

The braking power of spring brakes

The braking power of spring brakes is determined by adjusting the brakes. Both the conventional and emergency/parking brakes will not operate correctly if the brakes are not correctly set.