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US 6,640,651 B2Granted
Torque detector
AssigneeExedy Corporation
InventorHisashi Honjo
Life of this patent
Estimating the term…
Abstract
The present invention makes it possible to detect efficiently and accurately small torque. A torque detector includes a first shaft portion (first torque detecting portion), a first strain gage, a second shaft portion (second torque detecting portion), and a second strain gage. The first strain gage is provided on the first shaft portion. The second shaft portion has lower rigidity than the first shaft portion. The second torque sensor is provided on the second shaft portion to measure smaller torque than the first strain gage.
Claims20
A torque detector comprising:
- a first torque detecting portion having a predetermined rigidity;
- a first torque sensor being arranged to contact said first torque detecting portion to detect a first torque, said first torque being received by said first torque detecting portion;
- a second torque detecting portion having a lower rigidity than said first torque detecting portion, said second torque detecting portion being fixed to said first torque detecting portion;
- and
- a second torque sensor being arranged to contact said second torque detecting portion to detect a second torque, said second torque being smaller than that which said first torque sensor detects.
2 more elements
A torque detector comprising:
- a first torque detecting portion having a predetermined rigidity;
- a first torque sensor being arranged to contact said first torque detecting portion to detect a first torque, said first torque being received by said first torque detecting portion;
- a second torque detecting portion disposed to operate in series with said first torque detecting portion in a rotating direction and having lower rigidity than said first torque detecting portion;
- a second torque sensor being arranged to contact said second torque detecting portion to detect a second torque, said second torque being smaller than that which said first torque sensor detects;
- and
- a stopper portion disposed to operate in parallel with said second torque detecting portion in the rotating direction to stop torsional operation of said second torque detecting portion when a predetermined torsion angle is obtained.
3 more elements
A torque detector comprising:
- a first member including a first torque detecting portion having a predetermined rigidity and a second torque detecting portion disposed to operate in series with said first torque detecting portion in a rotating direction and having lower rigidity than said first torque detecting portion;
- a first torque sensor being arranged to contact said first torque detecting portion to detect a first torque, said first torque being received by said first torque detecting portion;
- a second torque sensor being arranged to contact said second torque detecting portion to detect a second torque, said second torque being smaller than that which said first torque sensor detects;
- a second member disposed close to said first member;
- and
- a stopper portion in parallel with said second torque detecting portion in the rotating direction to transmit torque between said second member and said first torque detecting portion and to prevent transmission of torque until a predetermined torsion angle is obtained.
3 more elements
A torque detector comprising:
- a first member having
- a cylindrical first torque detecting portion having a predetermined rigidity,
- a second torque detecting portion provided on an tip end of said first torque detecting portion and having lower rigidity than said first torque detecting portion;
- and
- a first flange formed between said first torque detecting portion and said second torque detecting portion;
- a first torque sensor being arranged to contact said first torque detecting portion to detect a first torque, said first torque being received by said first torque detecting portion;
- a second torque sensor being arranged to contact said second torque detecting portion to detect a second torque, said second torque being smaller than that which said first torque sensor detects;
- a second member connected in a rotating direction to said first member through said second torque detecting portion;
- and
- a stopper portion formed between said second member and said first flange to prevent transmission of torque until a torsion angle between said first member and said second member reaches a predetermined angle.
7 more elements
Dependencies are inferred from the claim text.