Machine element or mechanism – Elements – Flywheel – motion smoothing-type
Patent
1995-09-27
1997-12-16
Marmor, Charles A.
Machine element or mechanism
Elements
Flywheel, motion smoothing-type
192201, 192209, 464 3, 464 85, F16F 1522
Patent
active
056972610
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a damping device for absorbing rotation shocks and for damping vibrations, being of the type comprising damping means which are disposed between two coaxial rotating parts.
The invention is most particularly applicable to a motor vehicle clutch which incorporates an integral damping device, the two rotating parts of which are coupled in rotation, respectively, to the combustion engine of a power unit of the motor vehicle, and to the input shaft of a gearbox of the power unit.
2. Description of the Prior Art
The invention more particularly relates to a damping device of the same type as those which are described and shown in the documents FR-A-1 445 751 and DE-A-3 243 644, which describe and show damping devices of the type in which the damping means comprise at least one block of elastically deformable material which is interposed between the two rotating parts, and on which there acts a mechanism which comprises a cam coupled in rotation to one of the two rotating parts, together with a cam follower element which is coupled in rotation to the other one of the two rotating parts.
In the various examples of design of such a device illustrated in those documents, the block of elastically deformable material consists of a block of natural or synthetic rubber, to which tensile or compressive forces are applied as a function of the relative angular displacement of the two rotating parts.
In one of these cases, a set of rubber rings are provided, which are put into compression. That design does not produce a sufficiently strong damping effect, and it makes it necessary to resort to complementary helical compression springs.
In a second case, the block of elastically deformable material is a block which is adhesively secured between two parallel cylindrical surfaces, one of which is movable and undergoes a tensile force, which is transmitted to the block under the effect of the relative rotation of the two inertia parts. That solution is not entirely satisfactory, in that it does not give a sufficient progressive development of the damping effect, and in that the damping or reaction torque is always substantially proportional to the angle of relative displacement of the inertia masses.
SUMMARY OF THE INVENTION
An object of the present invention is to propose a novel design for a damping device of the type described above, but which is of simple design and which gives a damping effect which is particularly effective and can, in particular, give rise to a damping torque the value of which is not simply proportional to the angle of relative displacement of the two inertia parts.
To this end, the invention proposes a damping device of the type described above, characterised in that the cam is formed on a tilting member, which is articulated on a first one of the two rotating parts about a pivot which is eccentric with respect to the axis of rotation of the two rotating parts, and in that the cam follower element is a roller which is mounted for rotation about an axis carried by the second rotating part, and which cooperates with the cam when one of the two parts rotates with respect to the other in a first direction of rotation.
Thanks to the invention, by comparison with an arrangement using helical springs, it is possible to transmit a lower torque in the slow running mode of the engine, and to transmit a higher torque at the end of the displacement between the two parts. In addition, it is not necessary to provide a special friction device, due to the fact that the damping device includes a block of material which is deformable elastically with intrinsic friction. This block works under favourable conditions.
According to further features of the invention: the two rotating parts so as to engage, with a clearance, on one of the ends of the cam, starting from the rest position; tilting member which faces towards the axis of rotation of the two rotating parts; first rotating part and the tilting member; concave cylindrical surf
REFERENCES:
patent: 1641230 (1927-09-01), Manville
patent: 3701403 (1972-10-01), Peterson
patent: 4434878 (1984-03-01), Okubo
patent: 4500300 (1985-02-01), Wolf et al.
patent: 4560367 (1985-12-01), Wolf et al.
patent: 4800996 (1989-01-01), Loizeau
Duclos Didier
Mokdad Ayman
Marmor Charles A.
Rodriguez Saul J.
Valeo
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