Importance

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Abstract

A power torque tool has an output shaft along which torque pulses are transmitted to a load such as a bolt. The shaft is driven by a mechanism which can be of the impact-type or piston-and-cylinder type. The torque in the shaft is measured by an integral region of the shaft which stores a remanent magnetisation which emanates a torque-dependent magnetic field. The field is sensed by non-contacting sensor arrangement. The torque impulses may be processed to control the operation of the primary motor so as to stop the motor when a predetermined torque is reached. The nature of the torque pulses generated in a power torque tool is analysed together with procedures for processing the pulses. The measurement of torque loss in torque pulse transmission along a shaft is disclosed.

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First Claim