Spring devices – Vehicle – Mechanical spring and nonresilient retarder
Patent
1996-05-28
1999-08-10
Oberleitner, Robert J.
Spring devices
Vehicle
Mechanical spring and nonresilient retarder
1922133, 74574, B60G 1300
Patent
active
059346540
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a torsion damping device, especially a double damping flywheel forming a torque transmission device for a motor vehicle, of the type comprising two coaxial masses mounted movably in relation to one another in opposition to resilient means and friction means.
2. Description of the Prior Art
A torsion damping device is known which comprises a first mass intended to be fixed to a driving shaft, such as for example the crankshaft of the engine of a motor vehicle, and a second mass forming a reaction plate for a friction clutch, where the friction means are provided in a strengthening bearing part which extends between the first mass and the second mass. For this purpose, the bearing part comprises an axial shoulder provided with teeth which can be edge-formed, which serves to house a friction washer and a meshing washer biased for example by a Belleville washer, the teeth being edge-formed by means of a matrix of tools once the washers are in position. One may consider making the teeth thinner in relation to the shoulder and extending them in the shoulder by cut-outs so that the bending operation is facilitated.
However, the result after bending is not entirely satisfactory: the teeth are often twisted. Moreover, if the number of washers is increased in order to modulate the friction characteristics, the axial dimension of the teeth is lengthened, making twisting even more probable.
The object of the invention is in particular to remove this drawback.
SUMMARY OF THE INVENTION
The present invention provides a torsion damping device, especially a double damping flywheel for a motor vehicle, comprising two coaxial masses mounted movably in relation to one another in opposition to resilient means and friction means, a bearing part being provided between the said masses, integral with one of the said masses, and receiving for the most part the said friction means, the said bearing part comprising a punched annular shoulder engaging with teeth designed to be edge-formed so as to keep the friction means in position, characterised in that each tooth is framed by so-called stabilising lugs allowing the bending operation to be assisted by a matrix of tools.
Thanks to the presence of lateral lugs, the bending of each tooth is enclosed, therefore stabilised, and is performed without twisting. Moreover the teeth can now be lengthened, without a risk of twisting, in order to increase the thickness of the package of washers, here for example with the aim of installing two or more friction washers with different clearances and thus better to control the damping characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood in the light of the following description of an exemplified embodiment, this description being made with reference to the attached drawings on which:
FIG. 1 is a front sectional view, locally cut away, of a double damping flywheel with a device according to the invention, along line I--I of FIG. 2;
FIG. 2 is an axial sectional view along line II--II of FIG. 1;
FIG. 3 is a partial perspective view of the bearing part shown on FIGS. 1 and 2;
FIG. 4 is a perspective view showing the friction means installed in the bearing part;
FIG. 5 is a sectional view along line V--V of FIG. 4; and
FIG. 6 is an exploded view showing components of FIGS. 4 and 5.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
On FIGS. 1 and 2 a double damping flywheel for a motor vehicle is illustrated, comprising two coaxial masses 1 and 2 mounted movably in relation to one another in opposition to radially acting resilient means and axially acting friction means. These resilient and friction means will be described in detail further on.
The two masses 1 and 2 rotate in relation to one another around the axial axis of symmetry X--X.
The first mass 1 comprises, here in a single piece, a plate 11 and a tubular central hub 14 around which the mass 2 is rotationally mounted.
The second mass 2 also comprises a plate 21 extending
REFERENCES:
patent: 3817362 (1974-06-01), Rist
patent: 4036341 (1977-07-01), Beeskow et al.
patent: 4044874 (1977-08-01), Worner
patent: 4739866 (1988-04-01), Reik et al.
patent: 4782933 (1988-11-01), Jackel et al.
patent: 5269725 (1993-12-01), Maucher et al.
Grieco Giovanni
Mokdad Ayman
Lipka Pamela J.
Oberleitner Robert J.
Valeo
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