Hydraulic pump gear mechanism

The utility model discloses a hydraulic pump gear mechanism, which relates to the technical field of hydraulic pumps, and comprises a shell, two rotating shafts, two annular gears and a plurality of hydraulic cylinders, the two corresponding sides of the shell are respectively provided with a liquid inlet and a liquid outlet, the two rotating shafts are rotatably arranged on the shell, the circumferential surfaces of the two rotating shafts are respectively provided with an annular gear in a sliding manner, and the annular gears are connected with the liquid inlet and the liquid outlet. The two annular gears are meshed with each other; and the two locking assemblies are arranged on the two rotating shafts correspondingly, the locking assemblies are used for limiting sliding of the annular gear, a plurality of sliding grooves are formed in the circumferential faces of the rotating shafts, sliding blocks are arranged in the sliding grooves in a sliding mode, and the sliding blocks are fixedly connected to the i