Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Coil spring
Reexamination Certificate
1999-01-27
2001-02-13
Browne, Lynne H. (Department: 3629)
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Coil spring
C464S068800, C464S067100, C464S066100, C192S213110, C192S213220, C192S213210
Reexamination Certificate
active
06186897
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.
SUMMARY OF THE INVENTION
An aim of the invention is to reduce the overall axial size of a torsional damper device including an intermediate damper of the above kind.
To be more precise, it consists in a torsional damper device of the kind briefly described hereinabove and which includes an intermediate damper, the torsional damper device being generally characterised in that the axially acting spring means of the intermediate damper are disposed radially between its circumferentially acting spring means and those of the pre-damper.
Accordingly, these axially acting spring means do not require any particular axial space to fit them, which advantageously has the benefit of reducing the overall axial size of the clutch.
The pre-damper and the intermediate damper both being on the same axial side of the web of the main damper, with first friction means operative on the other side of the web, forming part of the friction means of the main damper, and third friction means forming part of the friction means of the pre-damper and offset radially relative to the first friction means, in accordance with the invention the corresponding guide washer of the main damper preferably and advantageously has an annular portion between said first friction means and said third friction means which is offset axially towards the web of the main damper.
This advantageously forms a recess on the surface of the guide washer concerned of the main damper facilitating the operation at its location of any other member external to the torsional damper device, for example the control device usually associated with a clutch for engaging and disengaging the clutch.
This advantageously facilitates installing the torsional damper device in accordance with the invention in an increasingly congested environment.
REFERENCES:
patent: 4852711 (1989-08-01), Kitano et al.
patent: 4969855 (1990-11-01), Graton et al.
patent: 5249660 (1993-10-01), Feldhaus et al.
patent: 5795230 (1998-08-01), Lefevre
patent: 5885160 (1999-03-01), Tauvron
patent: 296 11 793 U (1996-08-01), None
patent: 19642913 (1997-04-01), None
patent: 0732525 (1996-09-01), None
patent: 2531162 (1984-02-01), None
patent: 2735548 (1996-12-01), None
Graton Michel
Tauvron Fabrice
Browne Lynne H.
Dunwoody Aaron M
Liniak Berenato Longacre & White
Valeo
LandOfFree
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