| 摘要 |
PROBLEM TO BE SOLVED: To provide an electro-hydraulic tightening tool which can drop the high peak pressure generated in the oil pulse when a bolt is tightened, or during a high load working before completely tightening the bolt, reduce any oil leakage caused by a high peak pressure, and suppress any drop of the tightening torque. SOLUTION: An output shaft 5 is rotatably supported in a liner 7 which is rotated together with an electric motor 1, an insertion groove 51 is penetrated in the output shaft 5 in the direction orthogonal to the output shaft, and a plurality of chambers with an oil therein are formed across blades disposed between the insertion groove 51 and the liner 7. The liner 7 is rotated to compress the oil and a high pressure chamber 71 is formed in at least one of the plurality of chambers. The oil pressure in the high pressure chamber presses the low pressure chambers, the output shaft is driven by the impact torque generated thereby, and a means, for example, a means 9 is provided for releasing the oil pressure in the high pressure chamber 71 generating the impact torque to the low pressure chamber 72.
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