192 clutches and power-stop control – Elements – Clutch element resiliently carried on hub
Patent
1995-12-15
1997-12-16
Bonck, Rodney H.
192 clutches and power-stop control
Elements
Clutch element resiliently carried on hub
74574, 192 7017, F16F 15133, F16F 1512
Patent
active
056974817
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a double damped flywheel, especially for a motor vehicle, of the kind comprising two coaxial masses, one primary and the other secondary, which are mounted for rotation of one with respect to the other, and one of which, namely the secondary coaxial mass, comprises a plate that constitutes the reaction plate of a clutch, with, interposed circumferentially between the said coaxial masses, resilient members which work between guide means fixed to the primary coaxial mass, and a drive plate which is fixed to the secondary coaxial mass.
2. Description of the Prior Art
Such a double damped flywheel, also known as a divided flywheel, is described in particular in the documents DE-A-41 18 686 and DE-A-41 17571.
In the document DE-A-41 18 686, the drive plate, which is in practice a sheet metal component, is in engagement through an axial portion with the end face of the plate of the secondary coaxial mass, and, apart from any probable seaming of the said axial portion on to the said end face, it is essentially fixed to this plate by means of lugs, which are bent at right angles to the back face of the latter and are appropriately bolted or riveted to it.
Apart from the fact that this results in a quite complex construction of the drive plate, it is necessary to reduce the plate at its outer periphery by the provision of a rebate for accommodating the lugs of the drive plate at this point, thus giving rise to the risk of a reduction in the mechanical strength of the said plate.
In the document DE-A-41 17 571, the drive plate extends radially as far as the inner periphery of the plate, so as to be secured to the latter in the vicinity of its inner periphery.
The drive plate is thus inserted axially between the plate of the secondary coaxial mass and the plate which jointly forms part of the primary coaxial mass, to the detriment of the axial size of the assembly.
In addition, in both cases the resilient members are disposed entirely radially outside the peripheral edge of the plate of the secondary coaxial mass, to the detriment of the diametral size of the assembly.
If, in order to reduce this diametral size, there is provided on the back face of the plate of the secondary coaxial mass an inclined surface which, with the plate of the primary coaxial mass, defines a chamber in which the resilient members are able to be at least partly engaged radially, the result is, as before, a reduction in the mechanical strength of the plate of the secondary coaxial mass at its outer periphery.
It is then necessary to make this plate as a particularly strong casting, for instance as a relatively expensive casting of the GS type, especially when it has an annular flange at the said outer periphery.
An object of the invention is a double damped flywheel in which a particular arrangement of the drive plate enables these drawbacks to be avoided, and which, in addition, leads to further advantages.
SUMMARY OF THE INVENTION
This double damped flywheel, which is of the kind defined above, is characterised in that the drive plate is shrunk on to the secondary coaxial mass at the outer periphery of the latter.
In this way, the drive plate is used for reinforcing the mechanical strength of the secondary coaxial mass, and more precisely that of its plate at the outer periphery of the latter.
An advantage is that it is then possible, without there being any need to make the said plate as a particularly strong casting, to provide on the back face of this plate an inclined surface which enables the resilient members to be at least partly engaged radially behind it, to the benefit of the diametral size of the assembly.
In addition, the drive plate has the advantage of remaining simple.
The drive plate is preferably shrunk, by means of an axial portion, on to a flange of the secondary mass to which the cover plate of the clutch is secured by screw fastening.
A result of the invention is that it is possible for only a small thickness of material to exist between
REFERENCES:
patent: 4732250 (1988-03-01), Maucher et al.
patent: 5160007 (1992-11-01), Reik et al.
Bonck Rodney H.
Valeo
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