ROTARY MACHINE Russian patent published in 1998 - IPC

FIELD: hydraulic and pneumatic drives of different devices. SUBSTANCE: rotary machine has housing with working space, rotor, and vanes with pressure relief device in contacting surfaces. Pressure relief device is made in form of three cavities on front and rear faces arranged across vane. Middle cavity on each face is connected with extreme cavities on opposite faces. Areas of extreme cavities are equal to each other and equal in sum to area of middle cavity. Extreme cavities are arranged on ends of vane symmetrically relative to middle cavity. Width of extreme cavity is equal to maximum travel of vane. EFFECT: enlarged operating capabilities. 6 dwg