At present, EPB brake calipers in the market mainly use two transmission modes, one is screw drive, the other is ball screw rotation; Both of these are spiral rotation, composed of a screw and a nut, which transmits motion and power through the rotation of a screw and a nut.
It is mainly to turn the rotational motion into a straight line motion, with a small torque to get a large thrust.
Compared with the traditional screw drive, the EPB with ball screw has the advantages of high efficiency, long life and smooth movement.
The characteristics of screw drive are: simple structure, convenient processing; Easy to self-lock; The thread has lateral clearance, reverse free stroke, poor positioning accuracy and axial stiffness; Large friction resistance, low transmission efficiency; Wear fast;
The characteristics of ball screw transmission are: small friction resistance, high transmission efficiency; The structure is more complex, the manufacturing process requirements are high, the cost is high; Smooth motion, no vibration when starting; Long life; No self-locking, self-locking device is required when self-locking.