GEROTOR MECHANISM FOR HYDRAULIC SCREW-ROTOR MACHINE Russian patent published in 2007 - IPC E21B4/02 F01C1/16 F16H55/08 

FIELD: drilling equipment, particularly gerotor mechanisms to be used in drives or pumps.

SUBSTANCE: gerotor mechanism comprises stator made as tubular body 1 and as covering member 2 with inner helical teeth 3, rotor 4 with outer helical teeth 5. Central longitudinal axes 6, 7 of rotor 4 and covering member 2 are shifted one from another by eccentricity 8 value a_w. Covering member 2 teeth end profile defines enveloping curve having r_s radii and formed by rotation of coordinate system X_oc, Y_oc including circle of r_s radius. Rotor teeth end profile defines enveloping curve having r_m radii and formed by rotation of coordinate system X_op, Y_or including circle of r_m radius. Center of circle having r_m radius is located on circle with R_op radius starting from coordinate system X_op, Y_or origin point offset from central longitudinal rotor axis by calculated eccentricity value aw. Radius r_s, radius r_m and eccentricity aw are related with each other.

EFFECT: improved power characteristics, power and torque developed in engine or pressure and flow rate in pump.

2 cl, 9 dwg