US5143183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eddy current braking system
Assignee: Isuzu Motors Ltd
•
Filing: 1991-07-19
•
Granted: 1992-09-01
•
Expires: 2011-07-19
Abstract
Abstract A vehicle braking system including a brake structure defining an annular surface; an annular magnet support disposed adjacent to the annular surface; a plurality of circumferentially spaced apart pairs of circumferentially spaced apart permanent 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 04:21
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
179 words
A vehicle braking system comprising: a brake structure defining an annular surface means; annular magnet support means disposed adjacent to 1 said annular surface; a plurality of circumferentially spaced apart pairs of circumferentially spaced apart permanent magnets mounted on said magnet support means and circumferentially spaced apart thereon, each said pair arranged with like polarities facing said annular surface and the polarities of said pairs of permanent magnets facing said annular surface alternating circumferentially; annular pole piece support means; a plurality of ferromagnetic pole pieces mounted on said pole piece support means and circumferentially spaced apart in positions between said annular surface 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 adjacent pair of permanent magnets; 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
179 words
A vehicle braking system comprising: a brake structure defining an annular surface means; annular magnet support means disposed adjacent to 1 said annular surface; a plurality of circumferentially spaced apart pairs of circumferentially spaced apart permanent magnets mounted on said magnet support means and circumferentially spaced apart thereon, each said pair arranged with like polarities facing said annular surface and the polarities of said pairs of permanent magnets facing said annular surface alternating circumferentially; annular pole piece support means; a plurality of ferromagnetic pole pieces mounted on said pole piece support means and circumferentially spaced apart in positions between said annular surface 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 adjacent pair of permanent magnets; 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
23 words
A braking system according to claim 4 wherein said permanent magnets are spaced apart on said magnet support means at a uniform pitch.
Claim 7
Dependent Claim
22 words
A braking system according to claim 1 wherein said annular magnet support means is disposed radially adjacent to said annular surface means.
Claim 8
Dependent Claim
23 words
A braking system according to claim 6 wherein said pole piece support means provides non-magnetic gaps between said circumferentially spaced apart pole pieces.
Claim 9
Dependent Claim
49 words
A braking system according to claim 7 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 10
Dependent Claim
35 words
A braking system according to claim 8 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 11
Dependent Claim
23 words
A braking system according to claim 9 wherein said permanent magnets are spaced apart on said magnet support means at a uniform pitch.
Claim 12
Dependent Claim
38 words
A braking system according to claim 6 wherein said brake structure is a drum, said annular surface means is a cylindrical surface thereon, and said annular magnet support is a cylindrical ring disposed radially within said cylindrical surface.
Claim 13
Dependent Claim
23 words
A braking system according to claim 11 wherein said pole piece support means provides non-magnetic gaps between said circumferentially spaced apart pole pieces.
Claim 14
Dependent Claim
49 words
A braking system according to claim 12 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 15
Dependent Claim
35 words
A braking system according to claim 13 wherein said circumferentially 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 16
Dependent Claim
23 words
A braking system according to claim 14 wherein said permanent magnets are spaced apart on said magnet support means at a uniform pitch.
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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |