Low Speed, High Torque Rotary Abutment Motor

A rotary abutment type hydraulic motor comprising:

• a housing formed of a housing top and a housing bottom that serves to contain the fluid and moving parts of the motor;
• an annular fluid passage formed within said housing, said fluid passage located surrounding the outer circumference of a drive shaft;
• a first port and a second port formed by said housing and in fluid communications with said annular fluid passage;
• a drive shaft rotatably mounted centrally within said housing;
• a rotor, rotatably mounted within said fluid passage and having a pair of aligned rotor vanes, a first rotor vane radially extended outward from said drive shaft and symmetric to a second rotor vane;
• a face seal between said rotor and said housing, said face seal adapted such that high pressure inside the fluid passage creates an urging force between the shaft and the pressurized fluid passes such as to force the seal against the shaft, thereby increasing the sealing pressure and making the seal more effective at higher pressures;
• and
• at least one rotary abutment that rotates in an overlapping concentric fashion over the path of each rotor vane and rotatably timed synchronizedly with said rotor such that between said rotor vane and said second rotary abutment, said entire rotary abutment will rotate in a pressure sealed manner;
• wherein said first rotor vane and said second rotor vane form the main operative valve for said motor.