Hengyang Heavy Industry Hydraulic Safety Emergency Brake SBD125-A for Cranes

classification

The caliper disc brake has strong heat dissipation capacity and good thermal stability, so it is widely used in most cars and light trucks.

The caliper disc brake can be divided into fixed caliper disc type and floating caliper disc type according to the structural type of the brake caliper.

Fixed caliper disc brake

The brake caliper of fixed caliper disc brake is fixed on the axle, which can neither rotate nor move along the axis direction of the brake disc. Therefore, brake pad actuators (such as hydraulic cylinders equivalent to brake wheel cylinders) must be installed on both sides of the brake disc to press the brake pads on both sides to the brake disc.

Figure 1 shows the structure diagram of the fixed caliper disc brake. The brake disc 1 is fixed to the wheel hub, and the brake caliper 5 is fixed to the axle, which cannot rotate or move axially along the brake disc. The brake caliper is equipped with two brake wheel cylinder pistons 2, which press against the brake pads 3 on both sides of the brake disc. When the driver steps down the brake pedal to brake the car, the brake fluid from the brake master cylinder is pressed into the brake wheel cylinder, the hydraulic pressure of the brake wheel cylinder rises, the pistons of the two wheel cylinders move to the brake disc under the hydraulic pressure, press the brake block against the brake disc, and the brake block clamps the brake disc to generate Friction torque to prevent the wheel from rotating, so as to achieve braking.

Floating caliper disc brake

The brake caliper of floating caliper disc brake is generally designed to slide axially relative to the brake disc. The hydraulic cylinder is only installed on the inner side of the brake disc, while the outer brake block is attached to the caliper body.

Figure 2 is the structural diagram of floating caliper disc brake. The brake caliper bracket 3 is fixed on the steering knuckle, and the brake caliper body 1 and bracket 3 can slide axially along the guide pin 2. When braking, piston 8, under the action of hydraulic force p1, pushes the movable brake block 6 (with friction block wear alarm device) towards the brake disc 4. At the same time, the reaction force p2 acting on the brake caliper body 1 pushes the brake caliper body to move to the right along the guide pin 2, causing the fixed brake block 5 fixed on the brake caliper body to press against the brake disc. So, the friction blocks on both sides of the brake disc clamp the brake disc under the action of p1 and p2, causing it to generate a braking torque on the brake disc in the opposite direction of motion, promoting the car to brake.

In contrast to the fixed caliper disc brake, the single side hydraulic cylinder structure of the floating caliper disc brake does not need to cross the oil passage of the brake disc, so not only the axial and radial dimensions are smaller, it is possible to arrange them closer to the wheel hub, but also the brake fluid is less likely to be heated and vaporized.

In addition, when the floating caliper disc brake is used to charge both the service and parking brakes, it is not necessary to add a parking brake caliper. Instead, it is only necessary to add some parking brake mechanical transmission parts near the hydraulic cylinder of the service brake caliper to push the piston of the hydraulic cylinder.