High-speed flow distribution cycloid hydraulic motor

The invention relates to a high-speed flow distribution cycloid hydraulic motor, and belongs to the technical field of hydraulic transmission. The cycloid hydraulic motor disclosed by the invention comprises a shell which is provided with a water inlet and a backflow port, and a flow distribution mechanism which is formed by a rotor of a cycloid pin wheel pair and a compound hydraulic flow channel of a flow distribution supporting plate, wherein the shell is provided with a stepped hole for installing a rotary shaft seal, an outer circle of the rotary shaft seal is directly arranged in the stepped hole; a front bearing in the installation direction of the rotary shaft seal is greater than a rear bearing in the length direction; a spacer ring is arranged between a front full-loaded needle roller bearing and a rear full-loaded needle roller bearing; an L-shaped steel skeleton rotary shaft seal sealing and multi-layer sealing structure is adopted. The rotary shaft seal sealing structure of the motor disclosed by