Impact torque generator for hydraulic power wrench

An impact torque generator for a hydraulic torque wrench, the impact torque generator comprising:

• a liner;
• a main shaft;
• a first drivable blade;
• and
• a second drivable blade,
• wherein:
• the liner is configured to be rotated by a rotor;
• the liner includes a cavity to be filled with hydraulic fluid;
• the liner includes sealing surfaces projecting from an inner peripheral surface of the liner which is adjacent to the cavity;
• the main shaft has two projections coaxially positioned inside the liner;
• the first drivable blade is positioned in the cavity;
• the first drivable blade has a first sealing surface at a first end of the first drivable blade and a second sealing surface at a second end of the first drivable blade;
• a cross-sectional shape of the first drivable blade is asymmetrical on both sides of a center line of the first drivable blade which intersects longitudinal sides of the first drivable blade;
• the second drivable blade is positioned in the cavity;
• the second drivable blade has a first sealing surface at a first end of the second drivable blade and a second sealing surface at a second end of the second drivable blade;
• a cross-sectional shape of the second drivable blade is asymmetrical on both sides of a center line of the second drivable blade which intersects longitudinal sides of the second drivable blade;
• the sealing surfaces of the liner are positioned so as to have 180 degree rotational symmetry across the cavity;
• the first sealing surface of the first drivable blade is configured to be in contact with a first of the sealing surfaces of the liner while the second sealing surface of the first drivable blade slides in contact with the inner peripheral surface of the liner so as to create a first seal such that a first portion of an interior of the liner is divided into a first high-pressure chamber and a first low-pressure chamber so as to generate impact torque on the main shaft;
• and
• the first sealing surface of the second drivable blade is configured to be in contact with a second of the sealing surfaces of the liner while the second sealing surface of the second drivable blade slides in contact with the inner peripheral surface of the liner so as to create a second seal such that a second portion of the interior of the liner is divided into a second high-pressure chamber and a second low-pressure chamber so as to generate impact torque on the main shaft.