Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1996-05-06
1998-05-26
Luong, Vinh T.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
74572, 464 68, F16F 1510, G06G 100
Patent
active
057551430
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damped flywheel, and more particularly to a double damped flywheel of the kind comprising two coaxial masses which are mounted for movement of one with respect to the other against the action of resilient means.
2. Description of the Prior Art
Such a damped flywheel, especially for motor vehicles, is described for example in the document FR-A-2 565 650. One of the masses, referred to as a "first mass", is adapted to be fixed to a driving shaft, while the other mass, referred to as a "second mass", includes a reaction plate for a friction clutch. Generally, the masses in question are made of moulded material, and are typically castings. This moulding is relatively difficult to carry out, because of the complexity of the arrangement. In addition, the castings do not withstand centrifugal forces well under extreme operating conditions.
For this reason, the documents FR-A-2 695 579 and EP-A-0 427 983 provide for the first mass to consist of a plurality of annular components, at least some of which are made of press-formed metal plate, and which are fixed coaxially to each other.
One of these members, referred to as first member, includes a central portion which is fixed to a hub and which carries a bearing for rotation of the other mass, which constitutes a reaction plate for a friction clutch.
A further one of the said members defines a spacing crown portion between the first member made from metal plate and a second member made from metal plate.
As a result, full advantage is not taken of these two members made from metal plate.
In addition, as can be best seen in FIG. 1 of the document EP-A-0 427 983, this crown member increases the radial size of the damped flywheel.
This can be detrimental in the case in which the damped flywheel is mounted within a casing having inclined walls which extend close to the outer periphery of the second mass. It is therefore desirable in some cases to reduce its radial size.
SUMMARY OF THE INVENTION
The invention is most particularly concerned with an improvement in the said first mass which enables the latter to be made in a simpler and less expensive way, in a material which is better able to resist the effects of centrifugal force, and without unduly increasing the radial size of the damped flywheel in the region of the outer periphery of the second mass.
More precisely, the invention provides 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 the action of resilient damping means, in which one of the masses, referred to as a first mass is adapted to be fixed to a driving shaft and consists of a plurality of annular members, at least some of which are press-formed from metal plate, and which are fixed to each other coaxially, and in which one of the above mentioned said annular members, referred to as the first annular member, is press-formed from metal plate and comprises a central portion, orientated generally transversely and fixed to a hub which carries a bearing for rotation of the other mass, referred to as the second mass, which constitutes the reaction plate of a friction clutch, characterised in that another one of the above mentioned said annular members, referred to as a third annular member, is press-formed from metal plate and comprises an annular radial plate having at its outer periphery a cylindrical skirt portion which extends axially and at least partly surrounds the second mass, and in that the said radial plate includes a first group of radial lugs by means of which it is fixed to the said first annular member, together with a second group of radial lugs which are configured for mounting the resilient damping means, the lugs of this second group being offset axially with respect to those in the first group, so that the external skirt portion encloses the resilient damping means.
Thanks to the invention it is possible to increase the inertia, while having high
REFERENCES:
patent: 4462269 (1984-07-01), Inglis
patent: 5111714 (1992-05-01), Honoki et al.
patent: 5123877 (1992-06-01), Maucher et al.
patent: 5323665 (1994-06-01), Redikar
patent: 5579665 (1996-12-01), Mott et al.
Luong Vinh T.
Valeo
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