Abstract: A liner 7 is provided with a cylinder portion 14a is formed in parallel to the rotation axis, and also a hydraulic fluid flow path 14c is formed which opens to a cylinder portion 14a to communicate with the interior of the liner serving as a high-pressure chamber and a low pressure chamber at the time of occurrence of the striking torque, and an automatic relief mechanism 14 is provided in which a cylindrical valve element 14b having a cutout portion 14b? serving as a flow path for hydraulic oil formed on the outer peripheral surface portion is disposed inside the cylinder portion 14a so as to be freely rotatable.

Abstract: A liner 7 is provided with a cylinder portion 14a is formed in parallel to the rotation axis, and also a hydraulic fluid flow path 14c is formed which opens to a cylinder portion 14a to communicate with the interior of the liner serving as a high-pressure chamber and a low pressure chamber at the time of occurrence of the striking torque, and an automatic relief mechanism 14 is provided in which a cylindrical valve element 14b having a cutout portion 14b? serving as a flow path for hydraulic oil formed on the outer peripheral surface portion is disposed inside the cylinder portion 14a so as to be freely rotatable.

Abstract: An impact torque adjusting device of a hydraulic torque wrench enhances the precision of the magnitude of the impact torque generated, shortens the generation period of impact torques, and enhances the durability when rotating in either of two directions, that is, in normal rotation (when tightening) and in reverse rotation (when loosening). A working fluid path 11b communicates with the inside of a liner 7 serving as a high-pressure chamber H and a low-pressure chamber L when an impact torque is formed. A valve body 11d biased in a direction of releasing the working fluid path 11b is disposed in the working fluid chamber 11b. 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.

Abstract: An impact torque adjusting device is constructed by forming an operating fluid channel 11b communicating through the inside of a liner 7 which becomes a high-pressure chamber H and a low-pressure chamber L at the time impact torque is generated. In the operating fluid channel 11b, a valve disc 11d is urged in the direction opening the operating fluid channel 11b. Behind the valve disc 11d, an oil chamber 11e communicates with the inside of the liner 7 which becomes a high-pressure chamber H at the time impact torque is generated, so that the operating fluid channel 11b may be narrowed in proportion to the increase of the operating fluid.

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).

Abstract: The present invention, the objective of which is to provide an impact torque adjusting device of hydraulic torque wrench capable of maintaining high accuracy of the amount of impact torque generated by the impact torque generator of hydraulic torque wrench, shortening the impact torque generating period and improving durability of the impact torque generator of hydraulic torque wrench, is constructed by forming an operating fluid channel 11b communicating through the inside of the liner 7 which becomes a high-pressure chamber H and a low-pressure chamber L at the time of generation of impact torque, disposing, in the operating fluid channel 11b, a valve disc 11d urged in the direction opening the operating fluid channel 11b, and forming, behind the valve disc 11d, an oil chamber 11e communicating with the inside of the liner 7 which becomes a high-pressure chamber H at the time of generation of impact torque, so that the operating fluid channel 11b may be narrowed in proportion to the increase of the operatin