| 摘要 |
<p>The objective of the present invention is to provide an impulse torque generator for a hydraulic torque wrench, which is durable, compact in size and capable of stably generating a large impulse torque, by eliminating the blade inserted in the main shaft. The present invention comprises a main shaft, a cam, inserted in the main shaft slidably in axial direction without turning against the main shaft and forming oil guide holes passing in axial direction inside, a cylinder storing the base end of the main shaft and cam, and forming oil chambers to be filled with a operating fluid across the cam, pins inserted in the cam groove of the cam, provided in projection on the inner circumferential face of the cylinder, a drive shaft to be connected to the drive source which rotatively drives the cylinder, and a check valve shutting off the circulation of operating fluid between the oil chambers formed across the cam, by selectively closing the oil guide holes formed in the cam depending of the relative rotating angle between the cam and the cylinder. <IMAGE></p> |
