Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1996-02-28
1998-07-28
Lorence, Richard M.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
464 68, 192 5561, 192 7017, F16F 15139, F16F 15167, F16F 15131
Patent
active
057849285
DESCRIPTION:
BRIEF SUMMARY
The present application claims the benefit of previously filed French patent application 95.08035 filed in France on Jun. 30, 1994 and PCT international application FR95/00876 filed on Jun. 30, 1995 to which the instant application corresponds.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to damped flywheels, especially for motor vehicles, of the kind comprising two coaxial masses, which are mounted for movement of one with respect to the other against the action of circumferentially acting resilient means and of an axially acting friction means. It also relates to a clutch, especially for a motor vehicle, equipped with such a flywheel.
2. Description of the Prior Art
Such a damped flywheel, which is also referred to as a double damped flywheel, is described for example in the document FR-A-2 565 650. Such a damped flywheel is adapted to absorb the vibrations which arise along the kinematic train constituted by the transmission, and which, in a motor vehicle, extends from the internal combustion engine to the road wheels.
In the said document, the friction means works between the first mass (a plate of the latter) which is adapted to be fixed to a drive shaft (the crankshaft of the engine of the vehicle) and a disc fixed on the second mass and comprising a reaction plate for a friction clutch, this being at the inner periphery of the damped flywheel.
As a result, it is necessary to machine the plate of the first mass at this point, and the friction means increases the axial size of the flywheel at this point.
However, such a device is well adapted to receive resilient means acting circumferentially between the two masses. Now, it is desirable that the first mass should have a high inertia, in order to obtain good damping of mechanical vibrations.
By contrast with this requirement, the machining of the first mass, the profiles which are necessary in order to accommodate the friction means, and the positioning of the circumferential resilient means, all lead to a reduction in this inertia.
An object of the present invention is to create a new structure for a damped flywheel or double flywheel, in which the inertias are made as high as possible.
SUMMARY OF THE INVENTION
In this connection, the present invention relates to a damped flywheel, especially for a motor vehicle, of the kind comprising two coaxial masses, mounted for movement of one with respect to the other against circumferentially acting resilient means and against an axially acting friction means. One of the masses, referred to as the first mass, is adapted to be mounted in rotation on a driving shaft (the crankshaft of the engine), while the other mass, referred to as the second mass, comprises a reaction plate offering a friction face for a friction disc which is adapted to be mounted in rotation on a driven shaft (the input shaft of the gearbox).
The invention is characterised mainly by the fact that the resilient means are disposed entirely radially inwardly of the inner periphery of the friction face of the second mass.
The invention makes it possible to increase the inertia of the first mass, the latter being able to be massive at the level of the friction face of the second mass.
This arrangement enables the axial size of the damped flywheel to be reduced, because the springs are not in facing relationship with the friction face.
In addition, there are no recesses to be formed at this point, so that the reaction plate is more robust.
It will be appreciated that the recess or recesses formed in the first mass, for accommodating the said resilient means, are located on a circle the diameter of which is smaller than that in the prior art, so that the inertia of the first mass is increased.
According to another aspect of the invention, the friction means is disposed radially outwardly of the resilient means.
In a modified version, the friction means is disposed radially inwardly of the resilient means, which enables the inertia of the first mass to be increased even more.
According to another aspect
REFERENCES:
patent: 4782936 (1988-11-01), Bopp
patent: 4790419 (1988-12-01), Loizeau
patent: 5083981 (1992-01-01), Forster
Bochot Jean-Claude
Mokdad Ayman
Lorence Richard M.
Valeo
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