| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an impact torque adjusting device of a hydraulic torque wrench, which can enhance the precision of the magnitude of the impact torque generated by an impact torque generating device of the hydraulic torque wrench, shorten a generation cycle of the impact torque and improve the durability of the impact torque generating device of the hydraulic torque wrench when a liner is rotated to two directions, namely, when the liner is rotated normally (tightened) and when the liner is rotated reversely (loosened). <P>SOLUTION: There is formed a working oil flow passage 15b to be communicated with the inside of the liner 7, whose inside becomes a high-pressure chamber H and a low-pressure chamber L when the impact torque is generated. A valve element 15d, which is energized to such a direction that the working oil flow passage 15b is opened, is disposed on the working oil flow passage 15b. An oil chamber 15e, which is communicated with a blade insertion part 8a of a main shaft 8 via flow passages 7c, 7d formed on lids 7a, 7b of the liner, is formed on the back side of the valve element 15d, so that the working oil flow passage 15b is narrowed when the pressure of the working oil in the blade insertion part 8a of the main shaft 8 is increased due to an increase in the pressure of the working oil in the high-pressure chamber H. <P>COPYRIGHT: (C)2012,JPO&INPIT |
