IMPACT TORQUE ADJUSTMENT DEVICE OF HYDRAULIC TORQUE WRENCH

Japanese Patent JP2017202553

A

PROBLEM TO BE SOLVED: To provide an impact torque adjustment device of a hydraulic torque wrench capable of enhancing the precision of extent of impact torque generated by an impact torque generation device of a hydraulic torque wrench, shortening a generation period of impact torque and improving durability of the impact torque generation device of the hydraulic torque wrench while making stable generation of the large impact torque by means of a durable, small-size and simple mechanism possible by removing a blade which is inserted to a main shaft.SOLUTION: A second operation oil channel L2 which communicates oil chambers A, B formed so as to hold a cam 4 to each other, is formed on a main shaft 3, a valve body 35 excited in the direction of opening the second operation oil channel L2 by means of a spring 34 is arranged on the second operation oil channel L2, at the same time, an operation oil communication path 36 communicated with the oil chamber A is formed on a rear part of the valve body 35 such that a hydraulic pressure of the oil chamber A turned to be a high pressure chamber upon generation of impact torque is applied and the second operation oil channel L2 is squeezed by the valve body 35 in accordance with rising of a pressure of operation oil of the high pressure chamber.SELECTED DRAWING: Figure 2

TATSUNO KOJI

JP2016096232A

November 16, 2017

May 12, 2016

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URYU SEISAKU LTD

B25B21/02

JP2002052476A	2002-02-19
JP2009083090A	2009-04-23
JPH02250777A	1990-10-08
JP2005052915A	2005-03-03

Osamu Mori

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