Patent US5215169A successfully refreshed from Google Patents.
US5215169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eddy current braking system
Assignee: Isuzu Motors Ltd
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Filing: 1991-07-19
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Granted: 1993-06-01
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Expires: 2011-07-19
Abstract
Abstract A vehicle braking system including a brake disk structure defining an annular surface and having an axis; an annular magnet support assembly disposed adjacent to the annular surface in the direction of the axis; a plurality of circumferentially spaced apart pairs of circumferentially spaced apart magnets mounted on the magnet support and circumferentially spaced apart thereon, each pair arranged with like polarities facing the annular surface and the polarities of the pairs of permanent magnets facing the annular surface alternating circumferentially; an annular pole piece support assembly; and a plurality of ferromagnetic pole pieces mounted on the pole piece support assembly and circumferentially spaced apart in positions between the annular surface and the permanent magnets, each pole piece disposed adjacent to a pair of the permanent magnets and having a circumferential length substantially greater than the circumferential length of either of the adjacent pair of permanent magnets. Also included in the system is an adjustment mechanism for producing relative angular movement between the magnet support and the pole piece support assembly so as to change the circumferential alignment between each of the pole pieces and the pair of permanent magnets adjacent thereto.
Inventors
- 👤 Tohru Kuwahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:50
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/046
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
210 words
A vehicle braking system comprising: brake disk means defining annular surface means having an axis; annular magnet support means disposed adjacent to said annular surface means in the direction of said axis; a plurality of pairs of permanent magnets mounted on said magnet support means and circumferentially spaced apart thereon at a uniform pitch, each said pair having directly adjacent spaced apart permanent magnets arranged with like polarities facing said annular surface means and wherein in each said pair the polarity facing said annular surface is opposite to that of each directly adjacent pair; annular pole piece support means; a plurality of ferromagnetic pole pieces of uniform length and mounted on said pole piece support means and circumferentially spaced apart at a uniform pitch and in positions between said annular surface means and said permanent magnets, each said pole piece disposed adjacent to a pair of said permanent magnets and having a circumferential length substantially greater than the circumferential length of either of said permanent magnets in each said pair; and adjustment means for producing relative angular movement between said magnet support means and said pole piece support means so as to change the circumferential alignment between each of said pole pieces and said pair of permanent magnets adjacent thereto.
Claim 2
Dependent Claim
210 words
A vehicle braking system comprising: brake disk means defining annular surface means having an axis; annular magnet support means disposed adjacent to said annular surface means in the direction of said axis; a plurality of pairs of permanent magnets mounted on said magnet support means and circumferentially spaced apart thereon at a uniform pitch, each said pair having directly adjacent spaced apart permanent magnets arranged with like polarities facing said annular surface means and wherein in each said pair the polarity facing said annular surface is opposite to that of each directly adjacent pair; annular pole piece support means; a plurality of ferromagnetic pole pieces of uniform length and mounted on said pole piece support means and circumferentially spaced apart at a uniform pitch and in positions between said annular surface means and said permanent magnets, each said pole piece disposed adjacent to a pair of said permanent magnets and having a circumferential length substantially greater than the circumferential length of either of said permanent magnets in each said pair; and adjustment means for producing relative angular movement between said magnet support means and said pole piece support means so as to change the circumferential alignment between each of said pole pieces and said pair of permanent magnets adjacent thereto.
Claim 3
Dependent Claim
23 words
A braking system according to claim 1 wherein said pole piece support means provides non-magnetic gaps between said circumferentially spaced apart pole pieces.
Claim 4
Dependent Claim
49 words
A braking system according to claim 2 wherein said adjustment means is adapted to provide alternately a braking condition in which each said pair is aligned with said adjacent pole piece and a non-braking condition in which said permanent magnets in each said pair straddle one of said gaps.
Claim 5
Dependent Claim
35 words
A braking system according to claim 3 wherein said circumferential length of each said pole piece is substantially equal to the combined circumferential lengths of said adjacent pair of permanent magnets and the spacing therebetween.
Claim 6
Dependent Claim
68 words
A braking system according to claim 1 wherein said annular surface means comprises axially spaced apart, substantially parallel first and second annular planar surfaces; said pole piece support means comprises axially spaced apart annular first and second plates each supporting a plurality of said pole pieces, said first and second surfaces straddling said first and second plates; and said first and second plates straddle said magnet support means.
Claim 7
Dependent Claim
23 words
A braking system according to claim 5 wherein said pole piece support means provides non-magnetic gaps between said, circumferentially spaced apart pole pieces.
Claim 8
Dependent Claim
49 words
A braking system according to claim 6 wherein said adjustment means is adapted to provide alternately a braking condition in which each said pair is aligned with said adjacent pole piece and a non-braking condition in which said permanent magnets in each said pair straddle one of said gaps.
Claim 9
Dependent Claim
35 words
A braking system according to claim 7 wherein said circumferential length of each said pole piece is substantially equal to the combined circumferential lengths of said adjacent pair of permanent magnets and the spacing therebetween.
Claim 10
Dependent Claim
26 words
A braking system according to claim 5 wherein said magnet support means provides non-magnetic gaps between each pair of circumferentially adjacent permanent magnets of unlike polarity.
Claim 11
Dependent Claim
23 words
A braking system according to claim 9 wherein said pole piece support means provides non-magnetic gaps between said circumferentially spaced apart pole pieces.
Claim 12
Dependent Claim
49 words
A braking system according to claim 10 wherein said adjustment means is adapted to provide alternately a braking condition in which each said pair is aligned with said adjacent pole piece and a non-braking condition in which said permanent magnets in each said pair straddle one of said gaps.
Claim 13
Dependent Claim
35 words
A braking system according to claim 11 wherein said circumferential length of each said pole piece is substantially equal to the combined circumferential lengths of said adjacent pair of permanent magnets and the spacing therebetween.
Claim 14
Dependent Claim
30 words
A braking system according to claim 9 wherein said magnet support means comprises a magnet support disk disposed between said first and second plates and said first and second surfaces.
Claim 15
Dependent Claim
23 words
A braking system according to claim 13 wherein said pole piece support means provides non-magnetic gaps between said circumferentially spaced apart pole pieces.
Claim 16
Dependent Claim
49 words
A braking system according to claim 14 wherein said adjustment means is adapted to provide alternately a braking condition in which each said pair is aligned with said adjacent pole piece and a non-braking condition in which said permanent magnets in each said pair straddle one of said gaps.
Claim 17
Dependent Claim
35 words
A braking system according to claim 15 wherein said circumferential length of each said pole piece is substantially equal to the combined circumferential lengths of said adjacent pair of permanent magnets and the spacing therebetween.
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) | 1996-05-31 | 1996-11-30 | 1997-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-31 | 2000-11-30 | 2001-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-31 | 2004-11-30 | 2005-06-01 | $7700.00 | Window Closed / Lapsed |