Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Reexamination Certificate
1999-01-27
2001-01-30
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
C464S063100, C192S213120
Reexamination Certificate
active
06179715
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns torsional damper devices of the type used in the construction of a motor vehicle friction clutch, for example.
2. Description of Related Art
Torsional damper devices of the above kind usually include, between an input member and an output member rotatable relative to each other, two dampers which, in kinematic terms, come into action successively upon relative angular movement between the input member and the output member, namely, in the reverse order to that in which they come into action, a main damper and a pre-damper, each of these dampers including two guide washers which, disposed on respective opposite axial sides of a web, are rotatable relative to the web, circumferentially acting spring means disposed circumferentially between the guide washers and the web, and friction means which, operative between the guide washers and the web or parts constrained to rotate therewith, are acted on by axially acting spring means.
In the construction of a friction clutch the input member is for example a disc which carries friction linings at its periphery which are clamped between the pressure plate and the reaction plate of the clutch and the output member is for example a hub adapted to be constrained to rotate with the input shaft of a gearbox.
The function of the dampers is to filter out vibrations caused by the engine, when idling in the case of the pre-damper and in normal operation in the case of the main damper.
To satisfy particular operating conditions document FR-A-2 735 548, to which this patent application explicitly refers, proposes the provision of a third or intermediate damper which comes into action after the pre-damper and before the main damper.
The above document also proposes pre-assembly of some of the components to form sub-assemblies, in order to reduce assembly time.
Accordingly, a first sub-assembly, in which the pre-damper is pre-assembled to the output member and/or a second sub-assembly in which a friction washer forming part of the friction means of the main damper is pre-assembled to the guide washer of the main damper at the shorter distance from the friction washer can be provided, if required.
SUMMARY OF THE INVENTION
The aim of the invention is to develop a sub-assembly form of construction of the above kind to reduce assembly time further.
To be more precise, it consists in a torsional damper device of the kind briefly described hereinabove and which includes an intermediate damper, said torsional damper device being generally characterised in that the guide washer of the intermediate damper at the greater axial distance from the web of the main damper has axial tenons constraining it to rotate with said web and said tenons pass completely through said web, are shaped to form elastically deformable hooks beyond said web and are adapted to clip onto said web.
Accordingly, if required, a third sub-assembly can advantageously be constructed within the torsional damper device comprising the web of the main damper, the web of the intermediate damper, the circumferentially acting spring members of the intermediate damper and the guide washer of the intermediate damper at the greater axial distance from the web of the main damper, with a friction washer between the web of the main damper and that of the intermediate damper.
The axially acting spring means of the intermediate damper are advantageously operative between the guide washer of the pre-damper at the greater axial distance from the web of the main damper and a retaining washer with coupling means adapted to operate axially between said retaining washer and the guide washer of the pre-damper at the shorter axial distance from the web of the main damper.
Accordingly the axially acting spring means of the intermediate damper are advantageously joined onto the first sub-assembly.
If, as disclosed in document FR-A-2 735 548, the guide washer of the pre-damper at the shorter axial distance from the web of the main damper is formed by the web of the intermediate damper, this latter web is shared by the first sub-assembly and the third sub-assembly and if required these two sub-assemblies can then together form part of a larger sub-assembly, to the further benefit of assembly time.
REFERENCES:
patent: 4969855 (1990-11-01), Graton et al.
patent: 5240458 (1993-08-01), Linglain et al.
patent: 5249660 (1993-10-01), Feldhaus et al.
patent: 5795230 (1998-08-01), Lefevre
patent: 5885160 (1999-03-01), Tauvron
patent: 19536866 (1996-11-01), None
patent: 0732525 (1996-04-01), None
patent: 2735548 (1996-12-01), None
Graton Michel
Tauvron Fabrice
Browne Lynne H.
Dunwoody Aaron
Liniak Berenato Longacre & White
Valeo
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