Mechanical-electronic-hydraulic integration light load linear reciprocating motion device driven by eccentric shaft motor

A type of light load linear reciprocating motion device was introduced in this paper, its piston is driven by eccentric shaft step motor through needle bearing directly, as the stroke amplified by internal reflux hydraulic stroke multiplier based on area effect, the ultimate linear motion export by the output piston. This device behaves significant advantages as follow: (1) due to the high flexibility of hydraulic, the layout and installation of cylinder is convenient; (2) the frequency, displacement and velocity of reciprocating motion can be changed by reprogramming the step motor; (3) hydraulic oil sealed in closed cylinder reduce the leakage, thus lead to high motion precision and small environment pollution; (4) with small eccentric distance and motion transferred by bearing, the eccentric torque and friction between driven piston and cylinder are small, which result in high system efficiency.