Jiaozuo brake

Advantages and disadvantages of electro-hydraulic drum brake:

The advantages and disadvantages of the above drum brakes can be analyzed and compared as follows.

(1) First of all, in terms of braking efficiency, under the condition that the structural parameters are basically the same, the automatic booster brake is fully utilized due to the increasing effect of friction force, and the braking efficiency is high, followed by the balanced brake, and the unbalanced brake is low. On the other hand, the friction coefficient between the brake shoe and the brake drum is itself an unstable factor, It varies in a wide range with the material properties, temperature and surface conditions of the brake drum and friction pad (such as whether they are contaminated with water, oil, etc.).The braking efficiency of the automatic booster brake is sensitive to the friction coefficient, so it is very unstable.

(2) Drum brakes make use of friction potentiation to ensure certain braking efficiency to varying degrees. However, in use, the stability of braking efficiency is poor because the friction coefficient is not stable.

(3) When the brake works, most of the heat generated by friction is transferred to the brake drum to raise its temperature. In order to reduce the temperature rise, the brake drum should have a large heat capacity.

Drum brake:

(1) Simple unbalanced brake: This is a common hydraulic wheel brake. In this kind of brake, the auxiliary potential shoe, by the action of friction force, causes the pressure on the brake drum to be much greater than the reducing potential shoe. In order to make the two shoes wear evenly, make the auxiliary potential shoe longer than the reducing potential shoe, so that the opening force acting on the shoe is different, but the friction torque is equal, so as to achieve the purpose of uniform wear.

(2) Balanced brake: the balanced brake has two types: one-way potential assistance and two-way potential assistance. The one-way potential assistance balanced brake has the function of automatic potential assistance when each shoe is hard pressed against the brake drum, but when reversing, it will become a reduced potential shoe, with poor braking effect. Because of its large one-way braking torque, it is called one-way balanced brake. The front and rear brake wheel cylinders of the two-way balanced brake drive the two floating brake shoes. When braking forward, all the wheel cylinder pistons move outward under the action of hydraulic pressure, pressing the two shoe pads against the brake drum. Under the action of the friction torque of the brake drum, both shoes rotate in the direction of wheel rotation until the support at the outer end of the piston of the two wheel cylinders is pushed back to the end face of the wheel cylinder. This brake has good contact and uniform wear, The braking efficiency is high, which is mostly used by modern vehicles.

(3) Automatic booster brake: this structure bl130 uses this kind of brake shoe. The lower ends of the left and right shoes are connected by floating adjusting rods. When the upper end of the left shoe is pressed by the slave pump to the brake drum, the opening force of the slave pump is transmitted to the lower end of the right shoe through the potential assistance of the shoe. This thrust is greater than the opening force of the slave pump. The braking torque of the right shoe with the same potential assistance is greater than that of the left shoe, The braking efficiency of the whole brake is higher than that of the balanced brake, and it has a device that automatically adjusts the shoe clearance. Z4 and Z3 pictures

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