Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1994-11-28
1996-10-08
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74573R, G05G 100
Patent
active
055620140
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a fly wheel arrangement comprising a rotatable axle, a ring essentially forming the rotating mass of the fly wheel and a connecting means having essentially the shape of a cylinder or a conical shell and being made from fibre-reinforced plastics connecting the ring with the axle or with a part rotating therewith, the connecting means being glued to the ring at its outer end portion and to the axle or a part connected hereto at its inner end portion.
BACKGROUND ART
Danish Patent Application DK-B-160.687 discloses a fly wheel, wherein the connecting means has a plate-like, cross-sectional low U shape. The known fly wheel arrangement comprises two or four such connecting means grouped in pairs, each being glued to the ring and a hub wedged on the axle at their inner and outer end portions, respectively. During rotation of the fly wheel the ring generates strong centrifugal forces, and if the fly wheel is placed in moving transport means, such as airplanes or vehicles, the fly wheel arrangement is also subjected to a strong gyroscopic torque. The above mentioned forces in particular make heavy demands on the inner glued joints between the connecting means and the hub. The expansion of the ring produced by the centrifugal forces results in large angular displacements in the connecting means and as a result hereof corresponding high stresses. As indicated above these stresses in particular may cause problems at the inner glued joints with the hub.
Japanese Patent Application JP, A, 63-125841 discloses a fly wheel arrangement having a connection means in the shape of a conical shell which is connected to a ring-shaped rotating mass at its outer end portion and to a hub at its inner end portion.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a fly wheel arrangement of the above type, wherein the stresses in the connecting means and in particular in the connection between the connecting means and the axle is reduced in relation to prior art.
The fly wheel arrangement according to the invention is characterised in that the inner glued joint between the axle and the connecting means is arranged at a diameter at least three times the bearing diameter of the axle. As a gyroscopic torque at any point causes forces in the joint which are inversely proportional to the square of the distance of the point from the axis of rotation, the joint may advantageously be placed as far away from the axis of rotation as possible.
According to the invention, the connecting means may comprise fibers following an essentially circumferential path and fibers following a longitudinal path essentially at right angles to the circumferential fibers. The longitudinal fibers are able to absorb the tension and compression caused by the gyroscope torque, and the connecting means may comprise several circumferential fiber layers of varied thickness, fiber content and fiber material, whereby the density and the E-module thereof may be varied in the circumferential direction in such a manner so as to give a desired smooth deflection curve for the longitudinal generatrix. The expansion of a freely rotating ring is determined by the ratio between the density and the E-module, and the connecting means may be considered as composed of a plurality of such rings.
Moreover, according to the invention the axle may comprise a radially projecting disc ending at its outer periphery in an annular body projecting axially at least in one direction. The inner end of the connecting means is glued to the lower face of the annular body. This embodiment is particularly advantageous, as the centrifugal force thus causes pressure to arise in the glued joint.
A proper glued joint may be subjected to approximately the same shear stress in its entire joint area. The annular body on the disc is usually more rigid than the connecting means to be glued herewith. Consequently, the stress in the glue joint increases with the distance from the disc. However, by another embodiment of the inventio
REFERENCES:
patent: 4220055 (1980-09-01), Dubois et al.
patent: 4991462 (1991-02-01), Breslich et al.
patent: 5205189 (1993-04-01), Wesling et al.
patent: 5285700 (1994-02-01), Lau
Patent Abstract of Japan, vol. 12, No. 374, M-749, Abstract of Japan, A, 63-125841, 30 May 1988.
Derwent's abstract, No. K6307 D/41, week 8141, Abtract of Soviet Union, Patent 796577, 15 Jan. 1981.
Derwent's abstract, No. 90-237286/31, week 9031, Abstract of Soviet Union, Patent 1516664, 23 Oct. 1989.
Forskningscenter RIS.O slashed.
Luong Vinh T.
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