Importance

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Abstract

An impulse torque generator for a hydraulic torque wrench is durable, compact in size and capable of stably generating a large impulse torque while eliminating a blade being inserted in the main shaft. A main shaft has a cam thereon positioned to be slidable in an axial direction without turning against the main shaft. Oil guide holes pass in an axial direction inside the cam. A cylinder receives the base end of the main shaft and the cam, and forms oil chambers to be filled with an operating fluid across the cam. Pins are inserted in the cam groove of the cam, provided projecting from the inner circumferential face of the cylinder. A drive shaft is to be connected to a drive source which rotatively drives the cylinder. A check valve shuts 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 on the relative rotating angle between the cam and the cylinder.

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First Claim