US5921149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and process for active vibration damping
Assignee: GUMMIWERKE AG
•
Filing: 1995-02-24
•
Granted: 1999-07-13
•
Expires: 2015-02-24
Abstract
Abstract An active vibration damping system for a drive unit having at least one drive shaft is provided. The vibration damping system includes a flywheel which comprises a movable base element of a linear electric motor that acts on the rotation of the shaft. The linear electric motor consists of a linear machine which generates a traveling magnetic field. The turning direction of the traveling magnetic field chosen relative to the turning direction of the crankshaft such that when unacceptably low momentary turning rates are sensed, a thrust force is applied to the flywheel and when unacceptably high momentary turning rates are sensed, a retarding force is applied until an evening up of the crankshaft rotation or a rotary vibration damping is achieved.
Inventors
- 👤 Ullrich Masberg
- 👤 Klaus-Peter Zeyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:01
CPC Classifications
F; F02; F02B; F02B75/00; F02B75/06; F02N; F02N11/00; F02N11/04; F16; F16F; F16F15/00; F16F15/10; F16F15/18; F16F15/30; H; H02; H02K; H02K41/00; H02K41/02; H02K41/025; H02K7/00; H02K7/006; H02K7/02; H02K7/18; H02K2201/00; H02K2201/15; Y; Y02; Y02E; Y02E60/00; Y02E60/16
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
133 words
A method for active vibration damping a drive unit with at least one rotating shaft, a flywheel seated on the shaft adapted for use as a movable base element of a linear electric motor, a stationary base element of the linear electric motor, and a gap separating the movable base element from the stationary base element, the method including: sensing rotational irregularities of the shaft and providing a sensing signal; comparing the sensing signal with selected values and deriving a correction signal; and applying the correction signal to the linear electric motor to increase the rotation of the shaft in a first mode wherein current is supplied to the stationary base element and to decrease the rotation of the shaft in a second mode wherein current is drawn from the stationary base element.
Claim 2
Independent Claim
133 words
A method for active vibration damping a drive unit with at least one rotating shaft, a flywheel seated on the shaft adapted for use as a movable base element of a linear electric motor, a stationary base element of the linear electric motor, and a gap separating the movable base element from the stationary base element, the method including: sensing rotational irregularities of the shaft and providing a sensing signal; comparing the sensing signal with selected values and deriving a correction signal; and applying the correction signal to the linear electric motor to increase the rotation of the shaft in a first mode wherein current is supplied to the stationary base element and to decrease the rotation of the shaft in a second mode wherein current is drawn from the stationary base element.
Claim 3
Dependent Claim
25 words
The invention as in claim 1 wherein the sensing step includes measuring the momentary angular rate or the angular segment velocity directly from the shaft.
Claim 4
Dependent Claim
31 words
The invention as in claim 1 wherein the sensing step includes measuring resulting interference vibrations and deriving a momentary angular rate value or an angular segment velocity value of the shaft.
Claim 5
Dependent Claim
20 words
The invention as in claim 1 wherein the correction signal is applied periodically over a relatively long period of time.
Claim 6
Dependent Claim
94 words
A drive unit having an active vibration damping system comprising: at least one rotating shaft; a flywheel seated on the shaft adapted as a movable base element of a linear electric motor which is operable in a first mode to draw current and operable in a second mode to supply current; a stationary base element separated from the flywheel by a gap; and a control circuit disposed for sensing rotational irregularities of the shaft and providing control signals to the linear electric motor for generating a compensating magnetic flux in the linear electric motor.
Claim 7
Dependent Claim
94 words
A drive unit having an active vibration damping system comprising: at least one rotating shaft; a flywheel seated on the shaft adapted as a movable base element of a linear electric motor which is operable in a first mode to draw current and operable in a second mode to supply current; a stationary base element separated from the flywheel by a gap; and a control circuit disposed for sensing rotational irregularities of the shaft and providing control signals to the linear electric motor for generating a compensating magnetic flux in the linear electric motor.
Claim 8
Dependent Claim
44 words
The invention as in claim 5 wherein the control circuit comprises: a measurement sensor disposed for determining rotation irregularities on the shaft and providing sensing signals; a procesor disposed for comparing the sensing signal with selected correction values and for generating the control signals.
Claim 9
Dependent Claim
20 words
The invention as in claim 6 wherein the measurement sensor includes an angular segment turning-rate sensor mounted on the shaft.
Claim 10
Dependent Claim
27 words
The invention as in claim 6 wherein the measurement sensor comprises a vibration sensor disposed to detect interference vibrations resulting from turn-rate irregularities of the rotating shaft.
Claim 11
Dependent Claim
32 words
The invention as in claim 5 wherein the stationary base element and the flywheel are arranged such that the gap separating the stationary base element and the flywheel can be selectively varied.
Claim 12
Dependent Claim
64 words
The invention as in claim 9 further comprising switching means coupled with the linear electric motor and with the control circuit for operating the linear electric motor in the first mode upon the receipt of a first signal from the control circuit and for operating the linear electric motor in the second mode upon the receipt of a second signal from the control circuit.
Claim 13
Dependent Claim
42 words
The invention as in claim 10 wherein the shaft is a crankshaft of a motor-vehicle internal-combustion engine, and wherein the control circuit provides third signals to drive the linear electric motor as a starter during a starting operation of the drive unit.
Claim 14
Dependent Claim
19 words
The invention as in claim 11 further including a plurality of exciter coils disposed on the stationary base element.
Claim 15
Dependent Claim
25 words
The invention as in claim 11 wherein the stationary base element includes spaced exciter coils disposed proximate to at least one side of the flywheel.
Claim 16
Dependent Claim
49 words
The invention as in claim 13 wherein the gap separating the stationary base element and the flywheel is arranged in a gap plane and the flywheel includes a layer of material of high conductivity adapted to present an induced magnetic field in the layer perpendicular to the gap plane.
Claim 17
Dependent Claim
45 words
The invention as in claim 13 wherein the gap separating the stationary base element and the flywheel is arranged in a gap plane and further comprising a plurality of rotor coils arranged on the flywheel presenting an induced magnetic field perpendicular to the gap plane.
Claim 18
Dependent Claim
15 words
The invention as in claim 13 wherein the the flywheel has a T-shaped cross section.
Claim 19
Dependent Claim
17 words
The invention as in claim 13 wherein the flywheel is constructed as a passive rotary vibration eradicator.
Claim 20
Dependent Claim
33 words
The invention as in claim 17 wherein the flywheel comprises an inner rotating ring, an outer rotating ring arranged concentrically thereto, and a rubber layer elastically joining the outer and inner rotating rings.
Claim 21
Dependent Claim
18 words
The invention as in claim 18 wherein the flywheel is inclined with respect to its axis of rotation.
Claim 22
Dependent Claim
20 words
The invention as in claim 19 wherein the outer rotating ring is inclined with respect to the inner rotating ring.
References Cited (Backward Citations)
DE2123831B2
Cited
FR2102400A5
Cited
FR2140904A6
Cited
DE2228516B2
Cited
JPS551431A
Cited
JPS5572935A
Cited
DE3005561A1
Cited
EP0017724A1
Cited
EP0033191A2
Cited
DE3230607A1
Cited
US4977508A
Cited
DE3737192A1
Cited
JPH01307542A
Cited
US5140868A
Cited
JPH03149431A
Cited
JPH03168442A
Cited
DE4100937A1
Cited
US5185543A
Cited
WO1992007411A1
Cited
EP0544576A1
Cited
EP0604979A2
Cited
FR2707702A1
Cited
US5664534A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-07-12 | 2003-01-11 | 2003-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-07-12 | 2007-01-11 | 2007-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-07-12 | 2011-01-11 | 2011-07-13 | $7700.00 | Window Closed / Lapsed |