US4727757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferro-magnetic foil for a torque sensor
Assignee: Vacuumschmelze GmbH and Co KG
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Filing: 1987-04-03
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Granted: 1988-03-01
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Expires: 2007-04-03
Abstract
Abstract A torque sensor has a magnetic foil which is wound and attached to a rotating shaft in strip form at an angle to the shaft axis of rotation, the magnetic strip being mechanically stressed dependent upon the torque acting on the shaft, and generating voltages in two secondary windings surrounding the magnetic strips. The voltages will be different due to different forces acting on the two strips, this being a measure of the torque acting on the shaft. The strips are formed from stamped segments cut obliquely from an amorphous tape which is cast with a profiled cross-machine cross section having regions of varying thickness. Such a tape can be manufactured using a nozzle having a correspondingly shaped orifice opening through which molten amorphous alloy is discharged onto a moving cooling surface.
Inventors
- 👤 Hans-Rainer Hilzinger
- 👤 Hans-Joachim Nilius
- 👤 Michael Friedrichs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:35
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/02; G01L3/04; G01L3/10; G01L3/101; G01L3/102; G01L3/103; G01L3/105; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4998; Y10T29/49988; Y10T29/49989; Y10T428/00; Y10T428/12; Y10T428/12465
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
106 words
A ferro-magnetic foil for use on a shaft of a torque sensor having an axis of rotation comprising: a magnetostrictive amorphous strip section, said strip section being stamped from a larger amorphous strip having a plurality of cast periodic thickness variations across a width of said larger strip extending longitudinally along said larger strip, said strip section having spaced edges with said thickness variations running obliquely therebetween such that upon attachment of said strip section in a ring around a circumference of said shaft, said thickness variations are disposed at an angle between 0° and 90° with respect to said axis of rotation of said shaft.
Claim 2
Dependent Claim
106 words
A ferro-magnetic foil for use on a shaft of a torque sensor having an axis of rotation comprising: a magnetostrictive amorphous strip section, said strip section being stamped from a larger amorphous strip having a plurality of cast periodic thickness variations across a width of said larger strip extending longitudinally along said larger strip, said strip section having spaced edges with said thickness variations running obliquely therebetween such that upon attachment of said strip section in a ring around a circumference of said shaft, said thickness variations are disposed at an angle between 0° and 90° with respect to said axis of rotation of said shaft.
Claim 3
Dependent Claim
53 words
A ferro-magnetic foil as claimed in claim 1 wherein said strip section is stamped from said larger strip such that upon attachment in a ring around said circumference of said shaft, said thickness variations are disposed at an angle between 40° and 50° with respect to said axis of rotation of said shaft.
Claim 4
Dependent Claim
51 words
A ferro-magnetic foil as claimed in claim 1 wherein said strip section is stamped from said larger strip such that upon attachment in a ring around said circumference of said shaft, said thickness variations are disposed at an angle of 45° with respect to said axis of rotation of said shaft.
Claim 5
Dependent Claim
16 words
A ferro-magnetic foil as claimed in claim 1 wherein said strip section has a parallelogram shape.
Claim 6
Dependent Claim
100 words
A torque sensor comprising: a shaft subject to torque rotatable about an axis of rotation; respectively primary and secondary electrical windings spaced from and surrounding said shaft; and at least one magnetostrictive amorphous strip section stamped from a larger strip, said larger strip having a plurality of cast periodic thickness variations across a width of said larger strip extending longitudinally along said strip, and said stamped section being attached in a ring around a circumference of said shaft with said thickness variations disposed at an angle between 0° and 90° with respect to said axis of rotation of said shaft.
Claim 7
Dependent Claim
100 words
A torque sensor comprising: a shaft subject to torque rotatable about an axis of rotation; respectively primary and secondary electrical windings spaced from and surrounding said shaft; and at least one magnetostrictive amorphous strip section stamped from a larger strip, said larger strip having a plurality of cast periodic thickness variations across a width of said larger strip extending longitudinally along said strip, and said stamped section being attached in a ring around a circumference of said shaft with said thickness variations disposed at an angle between 0° and 90° with respect to said axis of rotation of said shaft.
Claim 8
Dependent Claim
45 words
A torque sensor as claimed in claim 5 wherein said stamped section is attached in a ring around said circumference of said shaft with said thickness variations disposed at an angle between 40° and 50° with respect to said axis of rotation of said shaft.
Claim 9
Dependent Claim
43 words
A torque sensor as claimed in claim 5 wherein said stamped section is attached in a ring around said circumference of said shaft with said thickness variations disposed at an angle of 45° with respect to said axis of rotation of said shaft.
Claim 10
Dependent Claim
26 words
A torque sensor as claimed in claim 5 comprising a plurality of said stamped section disposed end-to-end for completely surrounding the full circumference of said shaft.
Claim 11
Dependent Claim
23 words
A torque sensor as claimed in claim 5 comprising two of said stamped section disposed side-by-side each surrounding a circumference of said shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |