US3555326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Accelerometer for vehicular anti-skid system with sheathed rotor
Assignee: Continental Teves AG and Co OHG
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Filing: 1969-02-12
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Granted: 1971-01-12
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Expires: 1989-02-12
Abstract
Abstract An accelerometer has a solid cylindrical ferromagnetic rotor rotationally coupled to a vehicle wheel and coated with a conductive nonferromagnetic metal sheath. Magnets create a radial primary flux through the rotor while pickup coils located on the stator outside this field sense any variation in flux of a secondary field produced by the eddy currents in the coating. The output of these differentiating (pickup) coil is a function of the angular acceleration of the rotor and is used to regulate braking force in the wheel.
Inventors
- 👤 Albootaleb Talebi
- 👤 Erwin Schlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:49
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043; A; A23; A23L; A23L7/00; A23L7/10; A23L7/161; A23L7/174; A23L7/183; G; G01; G01P; G01P15/00; G01P15/003; G01P15/16; G01P15/165
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
In a vehicular antiskid brake system, an accelerometer comprising: a rotor including a solid substantially cylindrical ferromagnetic core rotatable about its axis, and a layer of a nonferromagnetic conductive metal forming a continuous sheath around said core; a stator surrounding said rotor and nonrotatable relative thereto; means on said stator forming a primary radial magnetic field through said rotor for inducing eddy currents in said sheath of nonferromagnetic metal; and a pickup coil on said stator responsive to changes in a secondary magnetic field generated by said eddy currents in said coating.
Claim 2
Dependent Claim
92 words
In a vehicular antiskid brake system, an accelerometer comprising: a rotor including a solid substantially cylindrical ferromagnetic core rotatable about its axis, and a layer of a nonferromagnetic conductive metal forming a continuous sheath around said core; a stator surrounding said rotor and nonrotatable relative thereto; means on said stator forming a primary radial magnetic field through said rotor for inducing eddy currents in said sheath of nonferromagnetic metal; and a pickup coil on said stator responsive to changes in a secondary magnetic field generated by said eddy currents in said coating.
Claim 3
Dependent Claim
18 words
The accelerometer defined in claim 1 wherein said pickup coil is disposed outside of said primary magnetic field.
Claim 4
Dependent Claim
16 words
The accelerometer defined in claim 1 wherein said layer is a coating applied to said core.
Claim 5
Dependent Claim
29 words
The accelerometer defined in claim 1 wherein said rotor is provided with axial shafts at ends of the rotor, said housing being formed with journals rotatably receiving said shafts.
Claim 6
Dependent Claim
29 words
The accelerometer defined in claim 1 wherein said means forming said magnetic field includes at least one permanent magnet having pole pieces on diametrically opposite sides of said rotor.
Claim 7
Dependent Claim
27 words
The accelerometer defined in claim 5 wherein said means forming said primary field includes at least two permanent magnets disposed on diametrically opposite sides of said rotor.
Claim 8
Dependent Claim
20 words
The accelerometer defined in claim 5 wherein two such pickup coils are provided on diametrically opposite sides of said rotor.
Claim 9
Dependent Claim
22 words
The accelerometer defined in claim 7 wherein said pickup coils are offset angularly about said axis from said poles by about 90*.
Claim 10
Dependent Claim
158 words
The accelerometer defined in claim 1 wherein said stator comprises a cylindrical ferromagetic sleeve surrounding said core and said sheath over the entire length thereof, and a pair of end pieced flanking said core and said sheath, said core being iron and said sheath being copper; said means forming said primary magnetic field includes a pair of pole pieces on said stator of opposite magnetic polarity closely spaced from said sheath on diametrically opposite sides of said rotor and confronting said rotor with a cylindrical concavity centered on said axis; said rotor includes a pair of axially extending shafts of a diameter less than that of said core and said sheath and journaled in said end pieces; and said pickup coil comprises two differentiating coils located on diametrically opposite sides of said rotor and offset by 90* from said pole pieces about said axis, said differentiating coils having an output related to the angular acceleration of said rotor.
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |