Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1996-08-16
1998-08-25
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 464 64, 464 68, 1321061, 1321062, F16F 1510
Patent
active
057972974
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention concerns damping flywheels, notably for motor vehicles, which have two coaxial masses mounted so as to be movable with respect to one another counter, firstly, to elastic means having at least one elastic member acting radially overall between the said masses and pivotally mounted on each of the latter and, secondly, axially acting friction means. Such a flywheel is described for example in the document FR 94 04437, filed on 14 Apr., 1994.
2. Description of the Prior Art
In this document (FIG. 1), one i of the masses (the first) is fixed with respect to rotation to the crankshaft 20 of the engine of the vehicle, while the other mass 2 constitutes the reaction plate of a friction clutch.
The elastic means are pivotally mounted, on the one hand, on the first mass by means of first pivot means and, on the other hand, on the second mass by means of second pivot means.
The friction means are located radially above the second pivot means.
The reaction plate 2 is hollowed out at 101 to house friction means 4 carried by a sheet metal component 100 integral with the first mass and defining with the latter a clevis for the pivotal mounting of the elastic means 3. The mass 2 presents a friction face for the friction disc 30 of the clutch.
This mass 2 is curved at 102 level with its hollow 101 for the mounting at its internal periphery of pivot pins for the elastic means 3.
As a result, the shape of the mass 2 is complicated, particularly since it has perforations for the fitting of driving studs 103 belonging to the friction means 4.
The friction disc 30 has a twisted shape at its internal periphery so as to be able to pass round the curved part 102 of the mass 2.
Furthermore, the friction means are relatively noisy, since they are carried by a component 100 made of thin metal sheet. In addition, these friction means are sensitive to the temperature of the mass 2, which can heat up notably when it forms the reaction plate of the friction clutch.
The object of the present invention is to overcome these drawbacks and therefore to simplify the second mass while attenuating noise and offering the friction means better thermal protection.
SUMMARY OF THE INVENTION
According to the invention, a damping flywheel of the aforementioned type is characterised in that the friction means are carried for the most part by the first mass, being located axially between the said first mass and the said elastic means, and in that the friction means have at least one friction washer suitable for being rotated, if applicable after a clearance has been taken up, by the second mass.
By virtue of the invention, the friction means enjoy better thermal protection, since they are further away from the second mass, which may attain much higher temperatures than the first mass.
Advantageously, the friction washer is driven by the second pivot means or a component attached to the second pivot means, for example a bush surrounding the second pivot means.
The second mass is simplified and stiffened since it has no hollow and no curved part.
Furthermore the friction disc is simplified since it is not necessary to provide a twisted shape at its internal periphery by virtue of the fact that the second mass has no curved part.
It is possible to increase the diameter of insertion of the pins carried by the second mass for the pivotal mounting of the elastic means. This is made possible by the absence of a hollow. Improved insertion of the pins is thereby obtained.
Noise is also attenuated since the first mass is more solid than the component 100 in FIG. 1. This component is therefore simplified and serves principally for mounting the pivot pins of the elastic means.
This assists a reduction in the axial size of the damping flywheel, the elastic means being able to come as close as possible to the second mass. This also enables the thickness of the first mass to be increased. The latter can therefore have a greater thickness at its external periphery than at its internal perip
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patent: 4889009 (1989-12-01), Friedmann et al.
patent: 4904226 (1990-02-01), Chasseguet et al.
patent: 4928486 (1990-05-01), Despres
patent: 5634543 (1997-06-01), Hashimoto et al.
Luong Vinh T.
Valeo
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