Taking the radial piston pump type small marine hydraulic motor as an example, how the motor converts the four-column hydraulic function into the mechanical energy output of the machine with the rotation method. The basic principle of the radial piston pump type Kawasaki motorcycle marine oil motor is shown in the figure below 4.23 (Japanese anime). Swash plate 1 and oil flap 4 are fixed, and the hydraulic piston pump 3 can be moved from the bore of the cylinder head 2. The swash plate centerline and the cylinder head axis cross one angle δ. When the high-pressure oil enters the hydraulic piston pump bore of the cylinder head according to the tip frame of the oil baffle, the hydraulic piston pump of the pressure chamber is released, pressing against the swash plate. The reaction force f of the swash plate to the piston pump is melted into the axial force fx and the vertical force fy. FX and the hydraulic pressure balance acting in the hydraulic piston pump, FY causes the cylinder head to rotate and promote the rotation of shaft 5. The rotation distance caused by the hydraulic motor reducer coupling should be the sum of the rotation distance of all hydraulic piston pumps in the high-pressure cavity, r - the radius of the hydraulic piston pump in the cylinder head; θ—the angle between the vertical centerline of the ith hydraulic piston pump and the cylinder head.
It is not difficult to see that with the change of angle θ, the rotation distance of each hydraulic piston pump is changed, and the overall rotation distance of the oil motor to expand the open output is single-pulse.
In principle, hydraulic pumps and hydraulic motors of the same method are substituted for each other. However, in general, an unlifted hydraulic pump cannot become an oil motor. This is because considering the pressure balance, the automatic compensation of the gap tightness and other factors, the structure of the hydraulic pump suction and oil discharge chamber is mostly irregular, and only rotates in one direction. However, as an oil motor, it generally requires forward and reverse rotation and symmetrical structure.
