US5675886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a magnetostrictive alloy torque sensor
Assignee: Panasonic Holdings Corp
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Filing: 1996-09-05
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Granted: 1997-10-14
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Expires: 2016-09-05
Abstract
Abstract A torque sensor including a magnetostrictive alloy ribbon having plural rows of plural hole groups arranged longitudinally in the direction at a required angle to the shaft, and the magnetostrictive alloy ribbon is glued to the surface of the shaft, and means for detecting magnetic change are arranged around the magnetostrictive alloy ribbon in order to detect torque.
Inventors
- 👤 Hiroyuki Hase
- 👤 Rihito Shoji
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:39
CPC Classifications
G; G01; G01L; G01L5/00; G01L3/00; G01L3/02; G01L3/04; G01L3/10; G01L3/101; G01L3/102; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/153; H01F1/15341; H10; H10N; H10N35/00; H10N35/101; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
95 words
A method of manufacturing a torque sensor which has a magnetostrictive alloy ribbon fixed to a surface of a shaft, and means for detecting magnetic change arranged outside said ribbon, comprising the steps of: etching a magnetostrictive alloy ribbon to form plural rows of plural holes disposed at an angle; winding the magnetostrictive alloy ribbon on a cylindrical inner structure whose diameter is substantially equal to the diameter of the shaft; placing the magnetostrictive alloy ribbon and the inner structure inside a cylindrical outer structure which is hollow; curling the magnetostrictive alloy ribbon by annealing.
Claim 2
Independent Claim
95 words
A method of manufacturing a torque sensor which has a magnetostrictive alloy ribbon fixed to a surface of a shaft, and means for detecting magnetic change arranged outside said ribbon, comprising the steps of: etching a magnetostrictive alloy ribbon to form plural rows of plural holes disposed at an angle; winding the magnetostrictive alloy ribbon on a cylindrical inner structure whose diameter is substantially equal to the diameter of the shaft; placing the magnetostrictive alloy ribbon and the inner structure inside a cylindrical outer structure which is hollow; curling the magnetostrictive alloy ribbon by annealing.
Claim 3
Dependent Claim
22 words
A method of manufacturing a torque sensor according to claim 1, wherein the annealing temperature ranges from 350° C. to 600° C.
Claim 4
Dependent Claim
34 words
A method of manufacturing a torque sensor according to claim 1, wherein the annealing atmosphere is at least a non-oxidizing atmosphere selected from the group consisting of an inert atmosphere and a depressurized atmosphere.
Claim 5
Dependent Claim
23 words
A method of manufacturing a torque sensor according to claim 3, wherein the depressurized atmosphere ranges from 1 torr to 1×10 -6 torr.
Claim 6
Dependent Claim
34 words
A method of manufacturing a torque sensor according to claim 3, wherein the inert atmosphere is at least one gas selected from the group consisting of Ar, He, Ne, N 2 , and CO.
Claim 7
Dependent Claim
43 words
A method of manufacturing a torque sensor according to claim 1, wherein the inner structure is made of a material having a high coefficient of thermal expansion while the outer structure is made of a material having a low coefficient of thermal expansion.
Claim 8
Dependent Claim
28 words
A method of manufacturing a torque sensor according to claim 1, wherein the distance between the inner structure and the outer structure is from 10 to 500 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-10-13 | 2001-04-14 | 2001-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-10-13 | 2005-04-14 | 2005-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-10-13 | 2009-04-14 | 2009-10-14 | $7700.00 | Window Closed / Lapsed |