Plunger structure of hydraulic brake-by-wire system

A plunger structure of a hydraulic brake-by-wire system comprises a shell, a piston, a ball screw and an end cover, the piston is sleeved with the shell, the ball screw is sleeved with the piston, a gear assembly is arranged between the ball screw and the end cover, a sealing assembly is arranged between the shell and the piston, and the sealing assembly is connected with the piston and the shell in a sealed mode. The gear assembly drives the ball screw to rotate, the ball screw drives the piston to reciprocate in the shell, rotation of the motor is converted into linear motion of the piston through the gear assembly, power-assisted pressure building of the motor is achieved, and dependence on a vacuum source of an engine is avoided. 一种液压线控制动系统柱塞结构，包括外壳、活塞、滚珠丝杆和端盖，所述外壳套设在活塞上，所述活塞套设在滚珠丝杆上，所述滚珠丝杆与端盖之间设置齿轮组件，所述外壳与活塞之间设置密封组件，所述密封组件分别与活塞和外壳密封相接，所述齿轮组件带动滚珠丝杆进行转动，所述滚珠丝杆带动活塞在外壳内往复运动，通过齿轮组件将电机的转动转化为活塞的直线运动，实现电机助力建压，避免对发动机真空源的依赖。