Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1995-07-13
1997-10-07
Marmor, Charles A.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
192 7017, F16F 15123, F16D 314
Patent
active
056735987
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 consisting generally of two coaxial masses which are mounted for rotation of one with respect to the other against a torsion damper device which includes a friction means, with one of the masses including a central nose projecting axially and penetrating into a central aperture of the other mass, and with support means being interposed between the said nose and the said aperture for the rotary mounting of the mass having the central aperture.
2. Description of Related Art
Such a damped flywheel is described in the document U.S. Pat. No. 4,782,933.
The support means conventionally consist of a ball bearing, which increases the selling price of the damped flywheel.
In addition, this bearing is usually lubricated so that the grease which it contains is able to escape and thus make the reaction plate and/or the friction means dirty, so that the performance and useful life of the damped flywheel are reduced.
Besides this, the rolling bearing can seize up. In the said document U.S. Pat. No. 4,782,993, the rolling bearing is associated with the above mentioned friction means.
More precisely, the friction means is carried by the central nose and is interposed axially between the inner ring of the rolling bearing and a plate of a first mass.
The friction means comprises, in the manner known per se, an axially acting resilient ring which bears on a thrust ring mounted on the central nose for rotation with the latter, and on a shoulder carried by the central nose, so as to clamp a friction ring, which carries friction liners on each of its faces, so producing frictional contact.
The said friction ring meshes with bars which are secured to the second mass.
Thus the friction ring is caused to rub against the plate and the thrust ring when the damped flywheel is working.
The said bars secure a damper plate, which is part of the torsion damper device, to a plate of the second mass, in such a way that these latter are subjected to biassing action by the friction means. Another result is that the arrangement consisting of the rolling bearing and friction means has a large axial size.
SUMMARY OF THE INVENTION
An object of the present invention is to overcome these drawbacks in a simple and inexpensive way, and accordingly to provide a novel damped flywheel which does not have a ball bearing, while also being more compact in the region of its central nose.
In accordance with the invention, a damped flywheel of the type described above, in which the torsion damper device includes a damper plate, is characterised in that the friction means is mounted in a cavity which is bounded by a plate of the second mass and by the damper plate, and in that the support means are of the plain bearing type and are interposed between the central nose and the central bores of the said plate and of the said damper plate.
Thanks to the invention, the selling price of the damped flywheel is reduced, and the axial size of the latter is reduced in the region of its central nose.
In addition, due to the cost-saving omission of the rolling bearing, it is possible to mount the friction means within the cavity in accordance with the invention.
It will also be appreciated that the length of the damper plate and of the said plate of the second mass are increased, because in practice the size of the support means is reduced in the radial direction, which enables the evacuation of heat to be improved, and therefore enables the plain bearing, in two parts according to the invention, to be conserved.
In addition, the second mass is mounted so as to turn on the first mass in a balanced manner, because the said plate of the second mass, and the damper plate, are supported.
In addition, the manufacture of the damped flywheel is simplified because it is possible to fit the friction means into the second mass.
Furthermore, it is possible to keep ready in advance the friction means which, after being fitted, is wel
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patent: 5176233 (1993-01-01), Woerner et al.
patent: 5229198 (1993-07-01), Schroeder
Battista Mary Ann
Marmor Charles A.
Valeo
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