Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1995-03-10
1998-02-03
Bonck, Rodney H.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
403367, 403273, G05G 100, F16B 214
Patent
active
057132461
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a method for fixing a composite energy-storing flywheel with pre-tension with an inner bore on a coaxial support rotating symmetrically with the latter and having a tapering outer surface, in which a ring is placed in the flywheel bore, said ring having a tapering inner surface, of which the taper corresponds with that of the support and the entire unit thus obtained is shifted on the support until the desired pre-tension is obtained.
DESCRIPTION OF THE PRIOR ART
A similar method is known from EP-B1- 0 137 759. The ring used in this known method has a cylindrical outer surface, fitting within the cylindrical bore of the flywheel, and is provided with a number of incisions running over the greatest part over its length. A consequence thereof is that the ring is elastically deformable in a radial direction due to changes in the widths of the incisions, with which it is intended to accomplish, that by placing the ring with the tapered inner bore on the tapered rotating symmetrical support, the outer surface in contact with the inner bore of the flywheel deflects outwards, thereby generating radial compressive stress in the flywheel.
The objection to this known method is that the presence of the longitudinal incisions, as a result of changes in their width, results in surface damage to the flywheel bore, and therefore in stress concentrations that could have fatal results at a high rotational speed, while the radial pre-tension attainable with this known method is still insufficient to avoid delamination of the flywheel when operating at extremely high rotational or peripheral velocities respectively in the order of 500-600 m/s.
SUMMARY OF THE INVENTION
The aim of this invention is to overcome this objection. In accordance with the invention this aim is achieved by designing both the inner bore of the flywheel and the co-operating outer surface of the ring, with a corresponding taper.
These measures result in an uninterrupted outer surface of the ring, so that the chance of damage to the inner bore of the flywheel is nil. Furthermore, a considerably higher pre-tension can be achieved, which means that higher flywheel rotational velocities are possible.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in connection with the drawing in which:
FIG. 1 is a longitudinal section through a flywheel energy storage unit, in which the flywheel parts have been fixed according to the method of the invention;
FIG. 2 is a partial section on an enlarged scale of an energy-storing flywheel part, in combination with the used clamping ring in accordance with the invention;
FIG. 3 explains the use of this clamping ring in combination with the flywheel part in a drawing which is not to scale.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 1 schematically shows a flywheel energy storage unit in its entirety indicated by reference numeral 2, containing a housing 4, with in it a stator 8 with stator windings 10, supported by suitable supports 6a and 6b. By means of suitable bearings 12a and 12b stator 8 bears a rotor 14, which consists of a rotor bush 16 and the disc-shaped flywheel parts 18a-18d, which are fixed on the rotor bush. Each of these flywheel discs has a wound and therefore stratified structure, as for example known from EP-A- 0 137 759.
During operation radially outward forces will occur in the respective flywheel parts, as a result of which delamination will occur when a certain limit value of the number of revolutions is exceeded. This limit value is increased by applying radial compression stresses via the conically clamped joints. In accordance with the invention these compression stresses are generated and the rotational velocity limit value is considerably increased by using a specially formed clamping ring in combination with a special configuration of the inner surface of each rotor part 18a-18d and the outer surface of rotor bush 16. As FIG. 2 in particular shows, the outer surface 20 of the preferably steel rotor bush is tapered, in such a w
REFERENCES:
patent: 4266442 (1981-05-01), Zorzi
patent: 4569114 (1986-02-01), Ashcombe et al.
Battista Mary Ann
Bonck Rodney H.
CCM Beheer B.V.
Jaskiewicz Edmund M.
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