Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1998-05-21
2000-05-16
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
464 68, 192214, 192 7017, 74572, G05G 100, F16F 1510, F16F 1522
Patent
active
060621036
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a double flywheel, especially for a motor vehicle, comprising two coaxial rotatable masses which are mounted for rotational movement of one with respect to the other about a common axial axis of symmetry, with coupling means being interposed operatively between the two masses.
2. Description of the Related Art
It is known from French patent No. 96 03231 filed on Mar. 14, 1997 to provide a double flywheel, in particular a damped double flywheel for a motor vehicle, comprising two coaxial rotatable masses which are mounted for rotary movement of one with respect to the other about a common axial axis of symmetry, with, interposed operatively between the two masses, coupling means and axially acting friction means, which are carried mostly by one of the masses, wherein a first one of the two masses is adapted to be coupled in rotation to a driving shaft, while the second of the two masses is adapted to be coupled in rotation disconnectably to a driven shaft and includes a plate (20) constituting the reaction plate of a friction clutch, and wherein the second mass is mounted for rotation on the first mass, and of the type in which the friction means comprise: is arranged to engage frictionally on a friction face of the said one of the masses, and which is coupled in rotation to the other one of the two masses; outwardly of the control ring, which meshes with the control ring with a circumferential clearance, and which is biased into contact with the said friction face; and and the friction ring being placed axially between the said friction face of the closure ring.
Thanks to the friction means, the design proposed in that document enables vibrations to be damped out by creating permanent friction, generally at a low level, so as to damp out vibrations, particularly in the slow running mode of the engine, and, beyond this slow running mode, to create differentially friction of higher intensity, the damped flywheel remaining very simple and having a reduced number of components.
In general terms, the permanent friction enables small oscillations to be damped out, while the differential friction enables larger oscillations to be damped out.
The design of the damping means proposed in that document does however have the disadvantage that it calls for a high number of components, which, apart from their number and their cost, greatly complicates the operation of assembling them together.
Thus, each of the first friction ring and the second friction ring is associated with an application ring and an axially acting resilient ring, these four additional components being interposed axially between the two associated friction rings and the closure ring.
An object of the present invention is to overcome these disadvantages and to respond to these requirements in a simple and inexpensive way.
It is therefore an object of the invention to reduce the number of components in the friction means.
According to the invention, a double flywheel of the type described above is characterised in that the control ring is arranged to engage frictionally, firstly on the said friction face, and secondly on the closure ring, and in that the control ring is gripped elastically between the said friction face and the closure ring.
According to further features of the invention: frictionally, firstly on the said friction face and secondly on the closure ring, which biases the control ring through its outer periphery, the control ring being gripped elastically between the said friction face and the inner periphery of the closure ring; surfaces, in particular radial or circumferential corrugations, which are offset axially and which are arranged to engage frictionally, firstly on the said friction face and secondly on the closure ring; oriented flange, for fastening the friction ring to the said one of the two masses, and which is joined, in particular by an axially oriented zone, to a generally radially oriented base, which is centrally perforated and whic
REFERENCES:
patent: 4724719 (1988-02-01), Werner et al.
patent: 4932286 (1990-06-01), Fukishima
patent: 5135092 (1992-08-01), Jackel
patent: 5788043 (1998-08-01), Feigler et al.
patent: 5797297 (1998-08-01), Mokdad
patent: 5826689 (1998-10-01), Bochot
Bertin Patrice
Soares Cesario
Tardiveau Christophe
Luong Vinh T.
Valeo
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