Patent · US Active

Power wrench with a torque sensing unit

US9186784B2 · kind B2 · utility

0Cited by

2References

9Claims

0Family size

Assignee

ATLAS COPCO INDUSTRIAL TECHNIQUE AB · SE

Inventors

Erik Vilhelm Persson · Bissenkamp, SE
Ulf Roland Brändström · Älta, SE
John Berglind · Tyresö, SE
Martin Hertsius · Bromma, SE

Key dates

Filing date	May 3, 2012
Grant date	Nov 17, 2015
Priority date	—
Expiry date	Dec 12, 2032

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB25B23/147
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

A power wrench with a torque sensing unit includes a housing, a motor, an output shaft, and a planetary reduction gearing connecting the motor to the output shaft and including a stationary ring gear supported in the housing, wherein the torque sensing unit includes a torque transferring element with a single radially extending reaction arm arranged to transfer reaction torque from the ring gear to the housing and carrying strain measuring sensors for generating signals in response to the transferred reaction torque. The torque transferring element includes an annular body with two weak portions to be elastically deformed during torque transfer and having flat surfaces for carrying the strain measuring sensors.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.