Rotary shafts – gudgeons – housings – and flexible couplings for ro – Torque transmitted via flexible element – Element is leaf spring
Patent
1996-06-18
2000-05-09
Browne, Lynne H.
Rotary shafts, gudgeons, housings, and flexible couplings for ro
Torque transmitted via flexible element
Element is leaf spring
464 74, 464 75, 1922131, 192209, F16D 304
Patent
active
060596627
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
a) Field of the Invention
The present invention relates to a torsion predamping device comprising at least two coaxial parts, mounted rotationally in relation to one another within the limits of a determined angular clearance and associated with resilient predamping and centring means.
The present invention more particularly relates to an improvement to a predamping sub-assembly intended to dampen the impact of the shock between a hub and a hub disc at the end of their angular clearance.
b) Description of Related Art
In a known torsion damping device, one of the rotational parts bears a driven plate assembly intended to be rotationally connected with a first shaft, in practice a driving shaft, the crankshaft of the internal combustion engine in the case of an application to a motor vehicle, whereas another of the rotational part comprises a hub by which it is intended to be rotationally connected with a second shaft, in practice a driven shaft, the primary shaft of a gearbox in the case concerned of such a motor vehicle.
In such an assembly, from document FR-A-2 496 210 it is known for example to add a torsion predamping sub-assembly in which the delimitation of the angular clearance between the two coaxial parts is provided by loose meshing means provided with small studs, made of elastomer, placed on the loose meshing teeth of one of the coaxial parts, against which the loose meshing elements of the other coaxial part come to abut in order to reduce the noise of impact at the end of travel of the loose meshing means.
However this solution does have drawbacks. On account of their reduced size, the studs indeed only provide localised damping, resulting in a residual noise which can not be eliminated. Moreover, the service life of these elastomeric elements is limited and they weaken the teeth on which they are placed.
SUMMARY OF THE INVENTION
To reduce these difficulties, the present invention proposes a new torsion predamping device, especially for a motor vehicle clutch, comprising two coaxial parts with loose meshing means between them and mounted rotationally in relation to one another in opposition to resilient means called predamping and centring means, characterised in that the meshing means comprise engaging teeth and engaged teeth and a crown insert made of material absorbing the shocks is disposed between the teeth.
All the moment of torsion is transmitted by means of the crown insert. The latter is relatively cheap to manufacture and is simple to put in place.
Furthermore, the loose meshing means (the engaging and engaged teeth) are not weakened, in contrast to those in document FR-A-2 496 210.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will moreover become apparent from the following description, by way of example, with reference to the drawings on which:
FIG. 1 is a sectional view of a clutch friction with a predamping device according to the invention;
FIG. 2 is a detailed view of the box of FIG. 1 on a larger scale;
FIG. 3 is a sectional view of FIG. 2, along line III--III;
FIG. 4 is a similar view to that of FIG. 3 according to another embodiment of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
These figures illustrate by way of example the application of the invention to a torsion damping device, which, intended to form a clutch friction for a motor vehicle clutch, comprises, successively rotatingly mounted two by two in relation to one another, three coaxial parts, i.e. a part A, essentially formed by a hub 10, a part B, essentially formed by a hub disc 11, which surrounds the hub 10, and a part C, essentially formed by two guide washers 12, disposed on either side of the hub disc 11 and surrounding the hub 10, connected to one another by small posts 9 and therefore actuated by the same rotational movement.
The coaxial part C bears a driven plate assembly 13, the friction linings of which are intended, in a known manner, to be clamped between two plates rotationally connected to a driving sha
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Phelps Nicolas
Villata Gino
Binda Greg
Browne Lynne H.
Valeo
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