Patent ID: 8430185

Claim:
An impact torque adjusting device of a hydraulic torque wrench, comprising: a liner to be turned by a rotor, said liner having a bore and an operating fluid channel extending laterally from and communicating with said bore, said operating fluid channel forming a high pressure chamber and a low pressure chamber during generation of an impact torque; a spindle inside said liner; a blade inside said liner; a cylindrical first valve member slidably arranged in said bore; and a cylindrical second valve member slidably arranged in said bore, said first valve member and said second valve member being arranged in said bore to face opposite to each other across said operating fluid channel, said first valve member and said second valve member being configured to slide away from and toward each other so as to respectively increase and reduce a cross-section of said operating fluid channel; wherein said liner has an oil chamber formed behind each of said first valve member and said second valve member and configured to communicate with said high pressure chamber during generation of the impact torque so as to jointly and simultaneously push and slide both said first valve member and said second valve member against an urging force and thereby reduce said cross-section of said operating fluid channel as an operating fluid pressure in said high pressure chamber increases.