Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1995-07-13
1998-03-31
Marmor, Charles A.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
192110B, 192204, F16F 15134
Patent
active
057326045
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to damped flywheels, especially for motor vehicles, of the kind generally comprising two coaxial masses mounted for rotation of one with respect to the other against a torsion damper device, with one of the masses comprising a central nose projecting axially and penetrating into a central aperture of the other mass, with support means being interposed between the said nose and the said aperture for rotatable mounting of the mass having the central aperture.
2. Description of Related Art
Such a damped flywheel is described in the documents FR-A-2 554 891 and FR-A-2 576 357.
Conventionally, the support means consist of a ball bearing, which increases the selling price of the damped flywheel.
This is all the more so since this bearing must withstand temperatures of the order of 200.degree. C.
In this connection, in a motor vehicle, one of the masses comprises a plate which constitutes the reaction plate of a clutch, which can reach not inconsiderable temperatures under severe working conditions.
In addition, this bearing is usually lubricated, so that the grease which it contains can escape and therefore contaminate the reaction plate and/or the friction means which convenitonally forms part of the torsion damper device, so that the performance and useful life of the damped flywheel are reduced.
Finally, the rolling bearing can seize
In order to overcome these drawbacks, the use of plain bearings can be considered as described in the above mentioned documents, but other problems do arise in a damped flywheel, in particular problems of lubricating the plain bearings, as well as those of abrasion resistance (due to oscillating movements of the damped flywheel) and temperature resistance.
In addition, corrosion problems can arise, especially when the vehicle is stationary for a long time. All of this results in the fact that these plain bearings have not been produced industrially for damped flywheels.
Furthermore, it is desirable to have support means that have as low a coefficient of friction as possible.
SUMMARY OF THE INVENTION
An object of the present invention is to mitigate these drawbacks, and accordingly to provide a novel damped flywheel which does not have a ball bearing, and which does have support means which are highly resistant to abrasion and temperature, and which have a low coefficient of friction, while having low sensitivity to corrosion.
In accordance with the invention, a damped flywheel of the type described above is characterised in that the support means comprise at least one plain bearing in the form of a semi-crystalline, hard material of polyetheretherketone such as "ARLON", for rotary mounting of the mass having the central aperture, on the mass having the central nose.
Thanks to the invention, the damped flywheel has support means which are highly resistant to abrasion and which have a low coefficient of friction.
In addition, this type of bearing is stable at the temperatures which may be attained by the damped flywheel.
Furthermore, its thickness is less than that of a rolling bearing.
This low thickness enables the reaction plate mentioned above to be lengthened so that evacuation of heat is improved.
In addition, it is possible to avoid the use of a nonstandard central nose and reaction plate of the damped flywheel.
To this end, it is sufficient to employ at least one ring which partly replaces the usual rolling bearing.
In general terms, the bearing in accordance with the invention is inexpensive, and in particular it enables the selling price of the damped flywheel to be reduced, while increasing the useful life of the latter and its reliability. No contamination of the reaction plate and/or of the friction means is possible, due to the fact that the bearing is of the dry friction type.
In addition, the bearing is an excellent electrical insulator, and is highly resistant to flaking and plastic flow. It also has good fatigue resistance. It withstands high loads and has good stress resistanc
REFERENCES:
patent: 3207000 (1965-09-01), White
patent: 4274524 (1981-06-01), Nakane
patent: 5069321 (1991-12-01), Reik et al.
patent: 5229198 (1993-07-01), Schroeder
Battista Mary Ann
Marmor Charles A.
Valeo
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