| 摘要 |
<p>To present a impact torque adjusting device of a hydraulic torque wrench (1) capable of enhancing the precision of the magnitude of the impact torque generated by the impact torque generating device (5) of the hydraulic torque wrench (1), shortening the generation period of impact toques, and enhancing the durability of the impact torque generating device (5) of the hydraulic torque wrench (1), when rotating in two directions, that is, in normal rotation (when tightening) and in reverse rotation (when loosening).
The present invention provides 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 (15b), 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).</p> |
