Small displacement hydraulic actuator

A small displacement hydraulic actuator, comprising a shell body (1), a main power shaft (2) connected to an external power source being installed on the shell body (1), and an oil distribution plate (3) being fixedly installed in an inner cavity of the shell body (1);

• wherein the main power shaft (2) is connected to the oil distribution plate (3) through a plunger pump (4), and an output shaft (5) for directly outputting to outside the shell body (1) is installed on the oil distribution plate (3);
• and the output shaft (5) is connected to the oil distribution plate (3) through a plunger motor (6), and power transmission is realized between the plunger pump (4) and the plunger motor (6) by conducting an oil passage channel;
• and
• the main power shaft (2) is arranged perpendicular to the output shaft (5), the plunger pump (4) is arranged perpendicular to the plunger motor (6), and vertical power reversal is realized through the oil distribution plate (3);
• and an oil inlet cover (7) is further arranged on the oil distribution plate (3), an oil inlet (701) is formed in the oil inlet cover (7), a filter element (8) is axially installed at the oil inlet (701) in a floating mode, along an axial direction of the oil inlet (701), with an axis of the filter element (8) being parallel to the axial direction of the oil inlet (701) and to an axis of the main power shaft (2), and a positioning spring (9) is installed between the filter element (8) and an inner wall of the shell body (1) along the axial direction of the oil inlet (701).