Electric power tool for tightening screw joints
AssigneeAtlas Copco Industrial Technique AB
InventorsJohan Rönblom, Lisa Erika Larsson, Göran Sivert Lantz, Taru Johanna Nordström
Life of this patent
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Abstract
An electric power tool for tightening screw joints includes a housing that encloses an electric motor, an angle gear, a back torque transducer, and a front torque transducer. The angle gear includes an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool. The back torque transducer is arranged to measure a back torque reaction value before the input bevel gear. And the front torque transducer is arranged to measure a front torque reaction value after the output bevel gear.
Claims14
An electric power tool for tightening screw joints, the electric power tool comprising a housing, and the housing enclosing at least:
- an electric motor;
- an angle gear comprising an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool;
- a back torque transducer configured to measure a back torque reaction value before the input bevel gear;
- and
- a front torque transducer configured to measure a front torque reaction value after the output bevel gear,
- wherein the front torque transducer comprises a front torque transferring element configured to transfer reaction torque to the housing and carrying front strain measuring sensors configured to generate the front torque transducer value and a front amplifier configured to amplify the front torque transducer value and arranged close to the front strain measuring sensors, and
- wherein the back torque transducer comprises a back torque transferring element configured to transfer back reaction torque to the housing and carrying back strain measuring sensors configured to generate the back torque transducer value.
An electric power tool for tightening screw joints, the electric power tool comprising a housing, and the housing enclosing at least:
- an electric motor;
- an angle gear comprising an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool;
- a back torque transducer configured to measure a back torque reaction value before the input bevel gear;
- and
- a front torque transducer configured to measure a front torque reaction value after the output bevel gear,
- wherein the front torque transducer comprises a front torque transferring element configured to transfer reaction torque to the housing and carrying front strain measuring sensors configured to generate the front torque transducer value and a front amplifier configured to amplify the front torque transducer value and arranged close to the front strain measuring sensors,
- wherein the electric power tool further comprises a controller configured to control the electric power tool, and
- wherein the controller is configured to control the tightening performed by the electric power tool based on one of the front torque transducer value or the back torque transducer value and monitor the tightening based on the other of the front torque transducer value or the back torque transducer value not used to control the tightening.
An electric power tool for tightening screw joints, the electric power tool comprising a housing, and the housing enclosing at least:
- an electric motor;
- an angle gear comprising an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool;
- a back torque transducer configured to measure a back torque reaction value before the input bevel gear;
- and
- a front torque transducer configured to measure a front torque reaction value after the output bevel gear,
- wherein the front torque transducer comprises a front torque transferring element configured to transfer reaction torque to the housing and carrying front strain measuring sensors configured to generate the front torque transducer value and a front amplifier configured to amplify the front torque transducer value and arranged close to the front strain measuring sensors,
- wherein the electric power tool further comprises a controller configured to control the electric power tool, and
- wherein the controller is configured to terminate the tightening when the front torque transducer value and the back torque transducer value exceed a torque difference limit.
A non-transitory computer readable storage medium storing a computer program which is executable by a computer of an electric power tool for tightening screw joints, the electric power tool comprising a housing, and the housing enclosing at least (i) an electric motor, (ii) an angle gear comprising an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool, (iii) a back torque transducer configured to measure a back torque reaction value before the input bevel gear, and (iv) a front torque transducer configured to measure a front torque reaction value after the output bevel gear, wherein the front torque transducer comprises a front torque transferring element configured to transfer reaction torque to the housing and carrying front strain measuring sensors configured to generate the front torque transducer value and a front amplifier configured to amplify the front torque transducer value and arranged close to the front strain measuring sensors, and wherein the computer program is executable by the computer to perform operations comprising:
- controlling the tightening performed by the electric power tool based on one of the front torque transducer value or the back torque transducer value;
- and
- monitoring the tightening based on the other of the front torque transducer value or the back torque transducer value not used to control the tightening.
A controller for an electric power tool for tightening screw joints, the electric power tool comprising a housing, and the housing enclosing at least (i) an electric motor, (ii) an angle gear comprising an input bevel gear drivingly connected to the electric motor and an output bevel gear drivingly connected to an output shaft of the electric power tool, (iii) a back torque transducer configured to measure a back torque reaction value before the input bevel gear, and (iv) a front torque transducer configured to measure a front torque reaction value after the output bevel gear, wherein the front torque transducer comprises a front torque transferring element configured to transfer reaction torque to the housing and carrying front strain measuring sensors configured to generate the front torque transducer value and a front amplifier configured to amplify the front torque transducer value and arranged close to the front strain measuring sensors, and wherein the controller is configured to:
- control the tightening performed by the electric power tool based on one of the front torque transducer value or the back torque transducer value;
- and
- monitor the tightening based on the other of the front torque transducer value or the back torque transducer value not used to control the tightening.
Dependencies are inferred from the claim text.