Working principle of disc brake  (Dieselpartsworld) 2016-01-17   

Disc brake working principle 2
The disc brake is similar to the brake on the bicycle.
The bicycle brake is provided with a brake pad for extrusion to the wheel caliper.
In a disc brake, the brake lining is pressed by the rotor instead of the wheel, and the pressure is transmitted over the cable instead of the cable.
The friction between the lining block and the disc will reduce the disk speed.
Working principle of disc brake
The moving vehicle has a certain kinetic energy, in order to stop the car, the brakes must be removed from the car. How does the brake do this? When you stop, the brakes will be converted to heat kinetic friction between the lining block and disc produced. Most of the car's disc brakes have a vent.
With ventilation hole of the disc brake disc between the two sides with a group of blades can be through the disc extraction of air to be cooled.
Working principle of fixed caliper disc brake
Structure of fixed caliper disc brake. Spanned in brake disc 1 on the brake caliper body 5 is fixedly arranged in the axle 6, it neither rotation cannot move along the brake disc axis direction, the two pistons 2 respectively at the brake disc 1 on both sides of the. Brake, brake oil liquid by the brake master cylinder, brake pump through the oil inlet 4 into the clamp body in two meet the hydraulic cavity (the equivalent of brake wheel cylinder), on both sides of the brake block 3 pressure to the wheel is fixedly connected with the brake disc 1, resulting in power system.
The brake caliper is connected with the 13 and the outer side of the clamp body 1 by a screw. Brake disc brake caliper into two brake pads 8. By the friction block and steel backplane riveting or bonding of the brake block 8 through the two brake block guide pin 11 rotation is arranged on the clamp body and along the guide pin to move. Inner and the outer sides of the clamp body in fact, each for a hydraulic cylinder, which each have apiston. The cylinder wall with trapezoidal cross section ring groove, which embedded in the rectangular section of the piston sealing ring 3, lateral clamp body front oil Road on both sides of the cylinder is connected, inner cylinder of the oil path is provided with a vent valve 12.
When braking, the brake fluid is pressed into the inner and outer sides of the cylinder. Two piston 4 moves down to the brake disc in hydraulic action and presses the brake block on the brake disc to generate friction torque. The oil cylinder piston 4 and the brake block 8 can be passed through the silencing piece 7, which can reduce the noise generated during braking. In the process of the piston movement, the edge of the rectangular rubber sealing ring is in the action of the piston friction force to move with the piston and generate micro elastic deformation.
When the brake is released, the piston and the brake block depend on the elasticity of the sealing ring and the spring 8 (as shown in Figure 3-20). Because the edge deformation of the rectangular sealing ring is very small, in the non braking, the brakeblock friction plate and the gap between the brake pads are only around 0.1mm, to ensure that the contact brake.
When the brake disc is heated and expands, the thickness is only changed with a smile, so the phenomenon of "dragging lag" can not occur. But the disc brake can not use the heated and easy expansion of the alcohol brake fluid, should use a special synthetic brake fluid. Brake block friction plate and the brake disc gap due to increase the wear, brake piston sealing ring deformation reaches its limit, piston is still under the hydraulic pressure to overcome sealing ring friction continues to move until the friction plate is pressed the brake disc. But come into contact with the brake, rectangular sealing ring will be the same distance from the piston pushed back to the distance and the friction wear before the friction brake pad and the disc gap between kept the standard value.
Thus, the rectangular sealing ring can also play the role of piston return spring and automatic adjustment of the gap between the brake. The structure and manufacturing process of the oil cylinder of the fixed caliper disc brake is similar to the general brake wheel cylinder, so the structure is adopted in the disc brake in the middle of the 1950s, until the end of the 60's is still in vogue. But the brake has the following disadvantages: more oil cylinder, the brake caliper complex structure; cylinder are respectively arranged in the brake disc on both sides, must use across the brake disc clamp oil groove or external tubing to connect, it is inevitable to make the size of the brake caliper is too large, difficult to install in the modern car wheel; heat load cylinder (especially the outer cylinder) and across the brake disc brake fluid in the tubing or oil in the way easy to heat of vaporization; if and for the parking brake must be equipped with a mechanical actuation of the parking brake clamp. These shortcomings make it difficult to adapt to the requirements of the use of modern cars, and gradually make the disc brake.