US4408500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rimmed and edge thickened Stodola shaped flywheel
Assignee: United States Department of Energy
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Filing: 1980-09-24
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Granted: 1983-10-11
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Expires: 2000-09-24
Abstract
Abstract A flywheel (10) is described that is useful for energy storage in a hybrid vehicle automotive power system or in some stationary applications. The flywheel (10) has a body (15) composed of essentially planar isotropic high strength material. The flywheel (10) body (15) is enclosed by a rim (50) of circumferentially wound fiber (2) embedded in resin (3). The rim (50) promotes flywheel (10) safety and survivability. The flywheel (10) has a truncated and edge thickened Stodola shape designed to optimize system mass and energy storage capability.
Inventors
- 👤 Satish V. Kulkarni
- 👤 Richard G. Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:23
CPC Classifications
F; F16; F16C; F16C15/00; F16F; F16F15/00; F16F15/30; F16F15/305; F16C2361/00; F16C2361/55; Y; Y02; Y02E; Y02E60/00; Y02E60/16; Y10; Y10T; Y10T74/00; Y10T74/21; Y10T74/2117; Y10T74/2119; Y10T74/212
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
A flywheel, which comprises: (a) a body shaped symmetrically about both an axis of rotation and a midplane perpendicular to the axis of rotation; and (b) said body having a thickness defined by the formula: ##EQU8## wherein: r=the perpendicular distance from the axis of rotation, t=the thickness of said body at a distance r from, and measured parallel to, the axis of rotation, t o =the thickness of said body at and along the axis of rotation, T=the thickness of said body where said body is edge thickened, R=the maximum radial dimension of said body, and C=an arbitrary positive constant of dimensionality reciprocal length squared which relates to an infinite Stodola flywheel corresponding to said flywheel by equaling the expression ρω 2 /2s o , wherein: ρ=the material density of said flywheel and said corresponding infinite Stodola flywheel, s o =the material rupture stress of said flywheel and said corresponding infinite Stodola flywheel, and ω=the angular speed at rupture of said corresponding infinite Stodola flywheel.
Claim 2
Dependent Claim
165 words
A flywheel, which comprises: (a) a body shaped symmetrically about both an axis of rotation and a midplane perpendicular to the axis of rotation; and (b) said body having a thickness defined by the formula: ##EQU8## wherein: r=the perpendicular distance from the axis of rotation, t=the thickness of said body at a distance r from, and measured parallel to, the axis of rotation, t o =the thickness of said body at and along the axis of rotation, T=the thickness of said body where said body is edge thickened, R=the maximum radial dimension of said body, and C=an arbitrary positive constant of dimensionality reciprocal length squared which relates to an infinite Stodola flywheel corresponding to said flywheel by equaling the expression ρω 2 /2s o , wherein: ρ=the material density of said flywheel and said corresponding infinite Stodola flywheel, s o =the material rupture stress of said flywheel and said corresponding infinite Stodola flywheel, and ω=the angular speed at rupture of said corresponding infinite Stodola flywheel.
Claim 3
Dependent Claim
49 words
A flywheel, as recited in claim 1, further comprising: (a) a rim shaped symmetrically about both the axis of rotation and the midplane perpendicular to the axis of rotation; and (b) said rim having a thickness defined by the formula: ##EQU9## wherein: R'=the maximum radial dimension of said rim.
Claim 4
Dependent Claim
28 words
A flywheel, as recited in claim 1, further comprising a rim shaped symmetrically about both the axis of rotation and the midplane perpendicular to the axis of rotation.
Claim 5
Dependent Claim
21 words
A flywheel, as recited in claim 2 or 3, further comprising: (a) said rim formed by circumferentially winding a fiber/resin composite.
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) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |