How the brakes work

working principle

During normal driving in the braking process, the driving wheel (ie, the wheel) in the brake rotates around the axle under the support of the bearing, and at the same time, the torque is transmitted to the rotor through the dog shift unit, so that it rotates with the driving hub. The remaining components, Such as shell; air chamber film; heat insulation disc; inner friction block; outer friction block; elastic brake assembly; elastic adjuster; When braking, the air supply from the air pump enters the air chamber, so that the response film in the air chamber expands and pushes the inner friction block assembly against the rotor, generating friction torque to decelerate the rotor. Under the action of the friction torque, the gear shift unit (dog shift) responds to the rotor When the speed changes, its special curved inclined groove structure drives the rotor to move in the direction of the outer friction block assembly in the mutual movement with the roller pin on the driving hub until it contacts with volvo Brake Caliper parts the outer friction block, so that the inner and outer friction blocks squeeze the rotor at the same time, resulting in The larger friction torque is used to realize the braking of the wheel. This friction torque is evenly divided by the inner and outer 5 friction blocks with a 360° annular division, which achieves the largest friction area on the rotor, so that the friction is affected during braking. Stable and effective.

2. The elastic brake assembly and the air chamber film assembly in Brake adjuster the slack adjuster brake; the elastic brake assembly and the slack adjuster form a mutual feedback brake compensation and friction gap adjustment system. The main function of the elastic brake assembly is to start and stop braking 2.1. When braking, the heat insulation disc squeezes the friction block assembly under the action of the expansion of the air chamber film, and drives the transmission axis of the slack adjuster to move in the direction of the rotor. The special meshing tooth profile between the helical ratchet teeth, when the internal clutch of the slack adjuster is closed under the action of the axial force, this special meshing tooth profile converts the axial motion into rotational motion, and the The gear meshes and rotates with the ring gear on the matched moving slide assembly. By adjusting the sliding slope of the moving slide, the gap between the pre-set friction block and the rotor is randomly adjusted, so that the brake can reach an appropriate degree of tightness. 2.2. When parking When the air supply stops, the air pressure in the piston assembly becomes smaller. Under the action of the elastic force of the disc spring in the elastic brake assembly, the 10 ejector rods extending out of the elastic brake are placed on top of the heat insulation discs to displace them in the direction of the rotor. When the heat insulation disc moves, the axial displacement of the drive shaft of the slack adjuster is also given, so that the slack adjuster can automatically adjust the gap between the friction block and the rotor as described in Section 2.1. At the same time, the ejector rod also passes through the top heat insulation disc. In addition, when the intake pressure drops to a certain value during driving, the top rod in the elastic brake assembly pushes the friction through the top heat insulation disc under the action of the disc spring. The block implements the braking. When the brake air pressure is insufficient, it acts as an insurance to compensate for the braking.

3. Wear indicator When the friction block in the brake is worn out, the gear ring of the moving slideway assembly and the heat shield that mesh with the gear of the wear indicator drive shaft drive the displacement of the drive shaft on the wear indicator, and pull the plunger cap on the wear indicator to retract. According to The step mark on the wear indicator housing can easily observe the wear state of the friction block outside the brake, which is convenient for maintenance and replacement of the friction block assembly.

4. When the quick release valve brakes, the large intake pressure pushes the diaphragm in the quick release valve to cover the exhaust port, so that it cannot be exhausted. At this moment, a large amount of air enters the air chamber to implement braking. When the air intake stops or the air chamber pressure exceeds When it is high, the return flow lifts the diaphragm to release the gas quickly to ensure the safety of the brake.