System for actively reducing radial vibrations in a rotating sha

Internal-combustion engines – Vibration compensating device

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

310 51, 318114, F02B 7506, H02K 3300

Patent

active

061386294

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to systems for reducion of radial vibrations of a rotating shaft.
2. Description of the Related Art
The invention concerns a system for active reduction of radial vibrations of a rotating shaft.
In piston engines, a multitude of various vibrations occurs as a result of the masses moving back and forth, as well as of the discontinuous combustion in the chamber. Besides vibrations of the overall engine, the drive shaft (i.e., the crankshaft) is excited in radial vibrations relative to the engine housing containing it. Because of the practically no-play mounting of the crankshaft in the radial direction, these vibrations are bending vibrations. Excitation of the vibrations occurs primarily through the radial components of the mass forces on the crank pins.
The bending vibrations represent a high stress on the crankshaft. Therefore, the crankshaft must be correspondingly heavily dimensioned in terms of strength. This requires, in particular, high-quality material and a costly production process (e.g., die forging). Furthermore, heavily loaded engines (such as diesel motors) must generally have a bearing after each crank throw. This produces great static overdetermination.
Resonance rises can occur in engines, especially those with a low number of cylinders, since the crankshaft along with the generally required flywheel forms an oscillatory system of low eigenfrequency, lying in the operating range of the internal combustion engine. This may produce resonance rises which can lead to fracture of the crankshaft.
To avoid resonance rises, vibration absorbers and dampeners are traditionally employed. A vibration absorber is an extra passive mass elastically coupled to the vibration system. The elastic coupling of the additional mass results in shifting of the original resonance frequency of the vibration system (more accurately, the original resonance frequency splits up into two different resonance frequencies). Through appropriate design of the extra mass and the stiffness of the elastic coupling, in many cases it is possible to make the new resonance frequencies no longer lie in the operating range, or at least no longer lie in an especially critical part of the operating range. Furthermore, by choosing a strongly dampening elastic coupling one can remove vibratory energy from the vibration system (by dissipation into heat) and reduce the size of any residual resonance rise (vibration dampener). In general, with the help of vibration absorbers/dampeners, one can master the problem of radial vibration in crankshafts.


SUMMARY OF THE INVENTION

A system for active reduction of radial vibrations of a rotating shaft (4), especially the drive shaft of an internal combustion engine (1), with at least one active electromagnetic device (7; 10; 15, 16), which is configured and controlled such that it applies radial forces to the shaft which counteract the radial vibrations of the shaft (4).


BRIEF DESCRIPTION OF THE DRAWINGS

The drawings show:
FIG. 1 a schematic cross section of a system for active reduction of radial vibrations with an actuator;
FIG. 2 a schematic representation, not to scale, of a system for active reduction of radial vibrations with an electric machine;
FIG. 3 a schematic cross section of the electric machine, perpendicular to the axial direction;
FIG. 4 a schematic cross section of a second embodiment of an electric machine, perpendicular to the axial direction;
FIG. 5a, 5b and 5c are a schematic sample representation of the mode of functioning of the vibration reduction.


DETAILED DESCRIPTION OF THE EMBODIMENTS

The purpose of the invention is to provide a different solution for the radial vibration problem of a shaft, especially the drive shaft of an internal combustion engine.
It accomplishes this purpose through a system for active reduction of radial vibrations of a shaft, especially the drive shaft of an internal combustion engine with at least one active electromagnetic device, which is designed and contr

REFERENCES:
patent: 2654849 (1953-10-01), Trofimov
patent: 2790917 (1957-04-01), Trofimov
patent: 3774303 (1973-11-01), Burkett et al.
patent: 3870116 (1975-03-01), Seliber
patent: 3902073 (1975-08-01), Lafuze
patent: 3974396 (1976-08-01), Schonball
patent: 4025860 (1977-05-01), Shibata et al.
patent: 4066936 (1978-01-01), Hirota
patent: 4346773 (1982-08-01), Hofbauer et al.
patent: 4699097 (1987-10-01), Tanaka et al.
patent: 4797602 (1989-01-01), West
patent: 4803376 (1989-02-01), N'Guyen
patent: 4883973 (1989-11-01), Lakey et al.
patent: 4942950 (1990-07-01), Watanabe et al.
patent: 4958095 (1990-09-01), Uchida et al.
patent: 5053632 (1991-10-01), Suzuki et al.
patent: 5109815 (1992-05-01), Maeda et al.
patent: 5125236 (1992-06-01), Clancey et al.
patent: 5303794 (1994-04-01), Hrovat et al.
patent: 5323743 (1994-06-01), Kristiansson
patent: 5325042 (1994-06-01), Murugan
patent: 5359308 (1994-10-01), Sun et al.
patent: 5431241 (1995-07-01), May et al.
patent: 5949162 (1999-09-01), Mishkevich et al.
N. Saridakis, "Golf mit Otto-Elektro-Hybridantrieb", ATZ, Atutomobiltechnische Zeitschrift 87 (1985) 11, pp. 581-584.
H. Baumann, Siedekuhlgefa.beta. mit Luftruhlung fur Traktionsstromrichter hoher Leistun:, etzArchiv, vol. 11. 1989, No. 7, pp. 213-220.
E. Blessmann, "Magnetic Couplings", Machine Design, Feb. 9, 1989, pp. 105-108.
Robert bosch GmbH, "Kraftfahrtechnisches Tashenbuch", VDI-Verlag, Dusseldorf, 21 ed. 1991, pp. 346-347; 361; 555-559; 763-767.
H. Deisenroth, C. Trabert: "Vermeidung von Uberspannungen bei pulsumrichterantrieben" etz, vol. 114, 1993, No. 17, pp. 1060-1067.
W. Gei.beta.ler, F. Unger-Weber: "Modelling the Three-Phase Propulsion System of a Modern Multisystem-Locamotive", EPE Firenze, (1991), pp. 4-632-4 637.
G. und H. Haberle, "Elektrische Maschinen in Anlagen der Energietechnik", Verlag Europa-Lehrmittel, Haan-Gruiten, 3. Auflage, 1994, Seiten 169-172.
G. Henneberger, "Elektrische Motoraustrustung", Braunschweig, 1990, pp. 98-103.
J. Langheim, J. Fetz: "Electric Citybus with two Induction Motors-Power Electronics and Motor Control", ETEP, vol. 2, No. 6, Nov./Dec. 1992, pp. 359-365.
"Kraftfahrzeugtechnik"11/82, pp. 346-347.
Litton prospect "Burstenloser Hohwellen-Resolver SSBH-15", Unterfohring.
J. Reinert et al., "Digital Control and Optimization of a Rolling Rotor Switched Reluctance Maching", IEEE Transactions on Industry Applications, vo. 31, No. 2, Mar. Apr. 1995, pp. 338-344.
F. Simovert, "Spannungszwischenkreis-Umrichter Baureihe 6SC44. . der Fa. Siemens AG", 1985, No. A 19100-E319-A262.
D. Teodorescu, "Kleinantriebe mit Vollpollaufer-Synchronmotoren", ema, May 1993, pp. 39-43.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

System for actively reducing radial vibrations in a rotating sha does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with System for actively reducing radial vibrations in a rotating sha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for actively reducing radial vibrations in a rotating sha will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-2040521

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.