US4481469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary speed sensor with Hall generator responding to tangential component of magnetic field
Assignee: Robert Bosch GmbH
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Filing: 1982-05-11
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Granted: 1984-11-06
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Expires: 2002-05-11
Abstract
Abstract To determine the rotary speed of a toothed element (1), for example the starter gear of an internal combustion (IC) engine, or a toothed wheel coupled to a wheel of a vehicle for evaluation of the speed, and change in speed thereof, for use in a brake anti-block system, a magnetic field is generated, for example by a permanent magnet (3) which has both radial and tangential components with respect to the teeth (2) of the rotary element. A magnetic field dependent sensor (4) such as a Hall generator or a thin-film permalloy-type magneto-resistive sensor is positioned to respond to the tangential component of the magnetic field, to thereby eliminate shifts in the null or center line about which the field strength undulates as the disk rotates to permit ready evaluation of the output from the sensor by threshold circuitry.
Inventors
- 👤 Peter Hauler
- 👤 Manfred Rothley
- 👤 Erich Zabler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:13
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/488; G01P3/487
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
105 words
Rotary speed sensor system having a toothed rotary element (1) of magnetic material, rotatable about an axis of rotation, in which the teeth have faces inclined with respect to radial lines intersecting the axis; a magnetic field responsive sensor (4); and means (3) to generate a magnetic field which includes both the teeth (2) of the rotary element and the sensor, wherein, in accordance with the invention, the sensor (4) is a field-dependent sensor and oriented and arranged relative to the field generated by the field generation means to respond to the tangential components of the magnetic field as the teeth (2) pass the sensor.
Claim 2
Dependent Claim
105 words
Rotary speed sensor system having a toothed rotary element (1) of magnetic material, rotatable about an axis of rotation, in which the teeth have faces inclined with respect to radial lines intersecting the axis; a magnetic field responsive sensor (4); and means (3) to generate a magnetic field which includes both the teeth (2) of the rotary element and the sensor, wherein, in accordance with the invention, the sensor (4) is a field-dependent sensor and oriented and arranged relative to the field generated by the field generation means to respond to the tangential components of the magnetic field as the teeth (2) pass the sensor.
Claim 3
Dependent Claim
21 words
System according to claim 1, wherein the rotary element is a gear, and the teeth are formed by the gear teeth.
Claim 4
Dependent Claim
31 words
System according to claim 1, wherein the means (3) to generate the magnetic field comprises permanent magnet means (3) positioned to be scanned by the teeth (2) of the rotary element.
Claim 5
Dependent Claim
34 words
System according to claim 1, wherein the sensor (4) is a Hall sensor positioned and arranged to have a magnetic field dependent direction which is tangential with respect to the toothed rotary element (1).
Claim 6
Dependent Claim
31 words
System according to claim 1, wherein the sensor (4) is a magneto resistive thin-film sensor on permalloy basis, having a magnetic field sensitive direction in the plane of the thin film.
Claim 7
Dependent Claim
34 words
System according to claim 2, wherein the sensor (4) is a Hall sensor positioned and arranged to have a magnetic field dependent direction which is tangential with respect to the toothed rotary element (1).
Claim 8
Dependent Claim
34 words
System according to claim 3, wherein the sensor (4) is a Hall sensor positioned and arranged to have a magnetic field dependent direction which is tangential with respect to the toothed rotary element (1).
Claim 9
Dependent Claim
31 words
System according to claim 2, wherein the sensor (4) is a magneto resistive thin-film sensor on permalloy basis, having a magnetic field sensitive direction in the plane of the thin film.
Claim 10
Dependent Claim
31 words
System according to claim 3, wherein the sensor (4) is a magneto resistive thin-film sensor on permalloy basis, having a magnetic field sensitive direction in the plane of the thin film.
Claim 11
Dependent Claim
18 words
System according to claim 1, wherein the rotary element is the starter gear of an internal combustion engine.
Claim 12
Dependent Claim
31 words
System according to claim 10, wherein the means (3) to generate the magnetic field comprises permanent magnet means (3) positioned to be scanned by the teeth (2) of the rotary element.
Claim 13
Dependent Claim
34 words
System according to claim 10, wherein the sensor (4) is a Hall sensor positioned and arranged to have a magnetic field dependent direction which is tangential with respect to the toothed rotary element (1).
Claim 14
Dependent Claim
31 words
System according to claim 10, wherein the sensor (4) is a magneto resistive thin-film sensor on permalloy basis, having a magnetic field sensitive direction in the plane of the thin film.
Claim 15
Dependent Claim
31 words
System according to claim 11, wherein the means (3) to generate the magnetic field comprises permanent magnet means (3) positioned to be scanned by the teeth (2) of the rotary element.
Claim 16
Dependent Claim
34 words
System according to claim 11, wherein the sensor (4) is a Hall sensor positioned and arranged to have a magnetic field dependent direction which is tangential with respect to the toothed rotary element (1).
Claim 17
Dependent Claim
31 words
System according to claim 11, wherein the sensor (4) is a magneto resistive thin-film sensor on permalloy basis, having a magnetic field sensitive direction in the plane of the thin film.
Claim 18
Dependent Claim
34 words
System according to claim 14, wherein the sensor (4) is a Hall sensor positioned and arranged to have a magnetic field dependent direction which is tangential with respect to the toothed rotary element (1).
Claim 19
Dependent Claim
31 words
System according to claim 14, wherein the sensor (4) is a magneto resistive thin-film sensor on permalloy basis, having a magnetic field sensitive direction in the plane of the thin film.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |