Impact torque adjusting device of hydraulic torque wrench

Abstract

[Problem] To present a impact torque adjusting device of a hydraulic torque wrench capable of enhancing the precision of the magnitude of the impact torque generated by the impact torque generating device of the hydraulic torque wrench, shortening the generation period of impact toques, and enhancing the durability of the impact torque generating device of the hydraulic torque wrench, when rotating in two directions, that is, in normal rotation (when tightening) and in reverse rotation (when loosening). [Solving Means] A working fluid path 11b for communicating with the inside of a liner 7 serving as a high-pressure chamber H and a low-pressure chamber L at the time of generation of a impact torque is formed, and a valve body 11d biased in a direction of releasing the working fluid path 11b is disposed in the working fluid chamber 11b, and at the rear back side of the valve body 11d, an oil chamber 15e is formed to communicate with a blade insertion part 8a of a main shaft 8 by way of fluid paths 7c, 7d formed in liner lids 7a, 7b, and thereby the working fluid path 11b is narrowed depending on an elevation of the pressure of the working fluid in the blade insertion part 8a of the main shaft 8 elevating along with an elevation of the working fluid in the high-pressure chamber H.

Dependencies are inferred from the claim text.