Single-blade hydraulic pressure self-servo swinging cylinder

The utility model discloses a single-blade hydraulic pressure self-servo swinging cylinder which comprises a flow distribution shaft (1), a cylinder body (3) and a motor (13). A blade (4), a fixing baffle (23) and a valve element (6) are arranged in the cylinder body (3), a left stair shaft of the flow distribution shaft (1) passes through a left end cover (2) of the cylinder body (3) and stretches out of the cylinder body (3), the valve element (6) is closely attached to the flow distribution end of the flow distribution shaft (1), and the valve element (6) and the end face of the flow distribution shaft (1) carry out flow distribution; a right stair shaft of the valve element (6) passes through a central hole of the right end cover (11) of the cylinder body (3) and is connected with an output shaft of the motor (13); the blade (4) and the fixing baffle (23) are arranged between the shaft shoulder of the flow distribution shaft (1) and the flow distribution end of the flow distribution shaft (1), the blade (4) is arranged on the right shaft section of the flow distribution shaft (1), the fixing baffle (23) is arranged on a clamping groove (44) in the cylinder body (3), and the blade (4) and the fixing baffle (23) take the right shaft section of the flow distribution shaft (1) as the center to be symmetrically arranged. The single-blade hydraulic pressure self-servo swinging cylinder has the advantages of being small in radial dimension, large in rotation axis deflection angle, good in dynamic property, simple in structure, and good in sealing performance.