Oil pump and oil cylinder integrated device driven by alternating current servo motor

An oil pump and oil cylinder integrated device driven by an alternating current servo motor comprises a hydraulic cylinder barrel. The middle portion of the hydraulic cylinder barrel is provided witha piston ring. The interior of the piston ring is connected with a bi-directional duplex inside engaged gear motor pump. Two output ends of the bi-directional duplex inside engaged gear motor pump areconnected with a first piston rod and a second piston rod correspondingly. The first piston rod and the second piston rod are connected with the piston ring. The first piston rod, the second piston rod and the piston ring communicate with one another through an oil path. The piston ring moves on the inner wall of the cylinder barrel after being sealed through a combined seal ring and guided by aguide belt. According to the oil pump and oil cylinder integrated device driven by the alternating current servo motor, the alternating current servo motor, the inside engaged gear pump and an air oilcylinder are integrated to