US5248133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multidimensional damping apparatus
Assignee: National Aerospace Laboratory of Japan
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Filing: 1992-03-30
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Granted: 1993-09-28
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Expires: 2012-03-30
Abstract
Abstract A plurality of eccentric rotors are rotatably fitted between a fixed base and an output shaft on which an object to be vibrationproofed is mounted, the output shaft being supported movably in 3 to 6 Degree-of-Freedom, magnet spring mechanisms are provided on fitted wall surfaces between the fixed base and the eccentric rotor, a composite vibrationproof adjusting spring is provided between the fixed base and the output shaft, the magnet spring mechanism responding to a fine displacement of the output shaft, and in a case where the output shaft is greatly displaced, the output shaft is braked so as to be restored to a predetermined position by the composite vibrationproof adjusting spring mechanism. The magnet spring mechanism produces a large braking force since a rotational angle is large and a rotational-angle speed is high due to eccentricity of eccentric rotors.
Inventors
- 👤 Osamu Okamoto
- 👤 Teruomi Nakaya
- 👤 Seizo Suzuki
- 👤 Naoaki Kuwano
- 👤 Kenji Ogimoto
- 👤 Ryuji Sakata
- 👤 Yasuaki Taniguchi
- 👤 Hiroyoshi Tanaka
- 👤 Goji Iba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:52
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/10; F16F15/02; F16F15/03
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
A multidimensional damping apparatus having a fixed base and an output shaft for mounting an object to be vibrationproofed, comprising: a plurality of eccentric rotors rotatably fitted through bearings between said fixed base and said output shaft, said output shaft being capable of effecting free displacement within at least a two-dimensional plane with respect to said fixed base and free rotation about an axis, magnet spring mechanisms provided on opposed fitted wall surfaces between said fixed base and a first one of said eccentric rotors and between said first eccentric rotor and a second one of said eccentric rotors, a composite vibrationproof adjusting spring provided between said fixed base and an object to be vibrationproofed, and the output shaft is braked so as to restore the output shaft to its initial position by said magnet spring mechanisms and said composite vibrationproof adjusting spring mechanism with respect to the displacement of said output shaft.
Claim 2
Dependent Claim
153 words
A multidimensional damping apparatus having a fixed base and an output shaft for mounting an object to be vibrationproofed, comprising: a plurality of eccentric rotors rotatably fitted through bearings between said fixed base and said output shaft, said output shaft being capable of effecting free displacement within at least a two-dimensional plane with respect to said fixed base and free rotation about an axis, magnet spring mechanisms provided on opposed fitted wall surfaces between said fixed base and a first one of said eccentric rotors and between said first eccentric rotor and a second one of said eccentric rotors, a composite vibrationproof adjusting spring provided between said fixed base and an object to be vibrationproofed, and the output shaft is braked so as to restore the output shaft to its initial position by said magnet spring mechanisms and said composite vibrationproof adjusting spring mechanism with respect to the displacement of said output shaft.
Claim 3
Dependent Claim
15 words
A multidimensional damping apparatus according to claim 1, wherein said bearing is a self-aligning bearing.
Claim 4
Dependent Claim
36 words
A multidimensional damping apparatus according to claim 1 or 2, wherein said output shaft is composed of a spring-supported rotor and a mounting shaft fitted in and supported on said spring-supported rotor through a linear bearing.
Claim 5
Dependent Claim
76 words
A multidimensional damping apparatus according to claim 1, wherein at least one of said magnet spring mechanisms is provided on one of a stator side and a rotor side with a high permeability pole-tooth type ring formed of a high permeability material and permanent magnets at equal pitch opposed to pole teeth of said high permeability pole-tooth type ring are arranged in a ring-like manner on the other of said stator side and said rotor side.
Claim 6
Dependent Claim
18 words
A multidimensional damping apparatus according to claim 4, wherein a good conductor is arranged between said pole teeth.
Claim 7
Dependent Claim
47 words
A multidimensional damping apparatus according to claim 1, wherein magnets of said magnet spring mechanisms are arranged on a stator side and on a rotor side opposed to said stator side at equal pitch relative to each other so that permanent magnets are opposed in different poles.
Claim 8
Dependent Claim
57 words
A multidimensional damping apparatus according to claim 6, wherein between the permanent magnets on one of a stator side and a rotor side is arranged an electromagnetic coil having a magnetic material positioned between said permanent magnets as a core, and a load is connected to said coil so that the load can be switched and adjusted.
Claim 9
Dependent Claim
59 words
A multidimensional damping apparatus according to claim 4, 5, 6 or 7, wherein said magnet spring mechanism has a magnet spring constant adjusting mechanism provided with a ring-like magnetic shield plate so that the latter can be moved in and out of a gap portion between the stator and the rotor so as to suitably adjust the spring constant.
Claim 10
Dependent Claim
97 words
A multidimensional damping apparatus according to claim 8, wherein said magnet spring constant adjusting mechanism has a ring-like magnetic shield plate which has a height about at least twice the height of the permanent magnets provided on said one of a stator side and a rotor side, which is formed of a high permeability material and in which a narrow good conductor is arranged on the lower half portion thereof with a phase deviated from the magnet pitch so as to be positioned between the permanent magnets, said ring-like magnetic shield plate being movable upward and downward.
Claim 11
Dependent Claim
54 words
A multidimensional damping apparatus according to claim 8, wherein a rotational angle detection sensor is mounted on the stator side opposed to the permanent magnets on the rotor side of said magnetic spring mechanism, and the vertical movement of said magnetic shield plate is controlled by an output of said rotational angle detection sensor.
Claim 12
Dependent Claim
32 words
A multidimensional damping apparatus according to claim 1, wherein said fixed base, said eccentric rotors, said output shaft and said magnet spring mechanisms are axially divided into at least two and assembled.
References Cited (Backward Citations)
US4749898A
Cited
US5005786A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-27 | 1997-03-29 | 1997-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-27 | 2001-03-29 | 2001-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-27 | 2005-03-29 | 2005-09-28 | $7700.00 | Window Closed / Lapsed |