The invention relates to a
hydraulic pressure cycloid rotor type motor structure. A hole pin type
cycloid rotor motor, and comprises a front end cover (6), a
machine seat (9), a rear end cover (12) and a flow distribution axle (10) positioned at the axle center of the
machine seat (9), the invention is characterized in that the flow distribution axle (10) is extended into the casing body (7), and an inner rotator (2) is connected coaxially and fixedly; a short amplitude outer
cycloid gear is arranged in the inner rotator (2); a plurality of sleeves (3) are embedded on the inner wall of the central cavity along the parallel operating plate (5); column pins (4) with the same number of the sleeves (3) are respectively penetrated into the sleeves (3), the
diameter of the column pin (4) is smaller than the sleeve (3), the column pins (4) are vertically fixed on the
machine seat (9) or the end covers (6) and (7), the distribution position on the plane of each column pin is the same as the sleeve (3), and the distance between the parallel operating plate (5) and the casing body (7) is larger than or equals to the
diameter difference of the sleeve (3) and the column pin (4). The invention increases the displacement of the
hydraulic motor; the torque and the speed are enhanced. The structure is simplified, the manufacturing process is improved, the cost is reduced, and the
mechanical efficiency and the service life of the motor are enhanced.