192 clutches and power-stop control – Clutches – Axially engaging
Patent
1996-04-29
1998-10-27
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Axially engaging
74574, 192214, 19211323, 1921134, 464 17, 464 68, F16F 1512, F16D 1360
Patent
active
058266895
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a torsion damper, especially a double damped flywheel constituting a torque transmitting device for a motor vehicle, and of the type comprising two coaxial masses which are mounted for circumferential movement of one with respect to the other against the action of circumferentially acting resilient means; more particularly, the invention relates to an improvement in such a device which enables a forced flow of air to be obtained between parts of the two coaxial masses, thus ensuring that it is cooled.
2. Description of the Prior Art
A torsion damper of the kind defined above is known, which comprises a first mass having a first platen adapted to be fixed to a driving shaft, such as for example the crankshaft of the engine of a motor vehicle, and a second mass comprising an annular second platen, together with a disc fixed to the latter in facing relationship with the said first mass and so configured as to constitute a damper plate for actuating circumferentially acting resilient means arranged between the two masses. The first mass is configured with a hub which is equipped with a rotary bearing, generally a ball bearing, on which the said second mass is mounted. The latter defines a platen which is adapted to constitute the reaction plate of a friction clutch, mounted in axial extension of the torsion damper. The clutch enables the second mass of this torsion damper to be coupled selectively to a driven shaft, such as for example the input shaft of a gearbox.
Such an arrangement is described for example in the document FR 2 662 760 (GB-A-2 244 543). In addition, in a known system of this kind, the bearing is disposed on a diameter smaller than the pitch circle diameter of the holes for the screw fasteners securing the said first mass on the driving shaft. The second mass has through holes in register with the threaded holes.
The invention relates to an improvement which is applicable in particular to the type of torsion damper described above, and which enables effective cooling of the latter to be obtained by forced circulation of air which flows radially outwardly between certain elements of the assembly.
SUMMARY OF THE INVENTION
More precisely, the invention provides a torsion damper, especially for a motor vehicle, comprising two coaxial masses mounted for circumferential movement of one with respect to the other against the action of circumferentially acting resilient means, namely, respectively, a first mass comprising a first platen adapted to be fixed to a driving shaft, and a second mass comprising an annular second platen adapted to constitute the reaction plate of a clutch and offering a friction surface to the clutch friction wheel comprised in the said clutch, and a disc fixed to the latter in facing relationship with the said first mass by means of rivets or analogous fastening means, the said disc constituting a damper plate for actuation of the said resilient means, wherein the said first mass is configured with a hub which is equipped with a bearing for rotation of the said second mass, and wherein an axial spacing means is interposed between the second platen and the damper plate around each rivet or analogous fastening means, characterised in that the damper plate is of press-formed metal plate and is extended radially inwardly by a cylindrical sleeve, in that the said bearing is fitted between the said cylindrical sleeve and the said hub, and in that an annular ventilation space is defined, firstly between the said second platen and the said damper plate in its radially innermost part, and secondly, between the said second platen and the said first mass in its radially outermost part.
Thanks to the invention, the second platen, which typically constitutes the reaction plate of a friction clutch, is well cooled. The bearing is thus cooled, since less heat is transmitted to it.
In addition, the second platen is simplified, and the disc performs several functions in a simple and inexpensive way.
The arran
REFERENCES:
patent: 5111714 (1992-05-01), Honoki et al.
patent: 5146811 (1992-09-01), Jackel
patent: 5156067 (1992-10-01), Umiyama
patent: 5194044 (1993-03-01), Jackel et al.
patent: 5279182 (1994-01-01), Fukushima
patent: 5368146 (1994-11-01), Kohno et al.
patent: 5597059 (1997-01-01), Gebauer et al.
patent: 5669478 (1997-09-01), Schierling et al.
Patent Abstracts of Japan vol. 18 No. 123 (M-1569), 28 Feb. 1994; JP A-53-12,053 22 Nov. 1993.
Bonck Rodney H.
Valeo
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