192 clutches and power-stop control – Clutches – Operators
Patent
1996-05-20
1998-09-29
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 30W, F16D 1358
Patent
active
058135073
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to cover plates for clutch diaphragms, especially for motor vehicles, and to unitary assemblies, referred to as clutch mechanisms, which include such a cover plate, in the manner described in the documents FR-A-2 585 424, EP-A-0 535 702, and FR-A-2 242 892.
2. Description of the Prior Art
As is known (FIGS. 1 to 4), a diaphragm clutch mechanism includes a unitary assembly of annular components, namely a cover plate 1 which is usually of metal plate, a pressure plate 5, which is usually a casting, and a metallic diaphragm 6.
The cover plate 1, which is in the form of a hollow dish, includes a base portion which is oriented transversely and formed with a central hole, and which has at its outer periphery a generally transversely oriented flange which extends radially away from the axis of the assembly.
The said flange has a first set of coplanar portions 2, through which it is adapted to be fixed on to a reaction plate indicated diagrammatically at 100 in FIG. 1, together with a second set of coplanar portions 3 which are set back axially with respect to the above mentioned portions, and by which it is attached, in a manner known per se by means of resilient tongues 4, which are oriented tangentially in this case, to the pressure plate 5, which is thus coupled to the cover plate for rotation with the cover plate but with freedom to move axially with respect to it.
In the present case, the portions 2 have holes 120, 121 through which there pass, respectively, fastening members and centring pins carried by the reaction plate 100.
Similarly, the portions 3 are formed with holes for fastening the tongues 4, which are fixed by means of fastening members at one of their ends to radial lugs of the plate 5, being fixed at their other end to the portions 3 through the said holes.
The diaphragm 6 comprises a peripheral portion in the form of a Belleville ring 7, together with a central portion which is divided into radial fingers 8 by slots 9, which extend from widened passages 10 formed between the fingers 8 at the level of the root zone of the fingers 8 to the Belleville ring 7. The diaphragm 6 has a frusto-conical form in the free state, and in this case it is of metal.
The outer periphery of the Belleville ring 7 acts on a divided projecting element (which is not given a reference numeral in FIG. 1) of the pressure plate 5, while the inner periphery of the said Belleville ring 7 bears on a primary abutment 11 carried by the base portion of the cover plate 1 and, in the present case, being in the form of a projecting element 11 which is press formed in the cover plate.
In a modified version, and as described in the document FR-A-2 242 892, this primary abutment may be defined by a thrust ring which is carried by the cover plate.
The clutch is normally in the engaged position, and the diaphragm 6 bears on the abutment 11 so as to act on the said projecting element of the pressure plate 5, in order to grip the friction liners of a clutch friction wheel 101 (indicated diagrammatically in FIG. 1) between the pressure and reaction plates.
In a motor vehicle, the reaction plate 100, which may be divided into two parts so as to constitute a damped flywheel, is adapted to be fixed on the crankshaft of the engine of the motor vehicle, while the clutch friction wheel is mounted on the input shaft of the gearbox for rotation with the latter.
In order to disengage the clutch, it is necessary to exert a thrust, in the direction of the arrow A in FIG. 1, on the ends of the fingers 8 with the aid of a clutch release bearing (not shown), so as to cause the diaphragm 6 to be deflected and thereby to cease to act on the pressure plate 5.
The tongues 4 then bias the plate 5 towards the base portion of the cover plate.
In this connection, the diaphragm 6 is mounted pivotally on the cover plate 1 by assembly means which apply the diaphragm pivotally to the cover plate.
In FIG. 1 these means comprise the primary abutment 11 mentioned above, retaining me
REFERENCES:
patent: 4558771 (1985-12-01), Despres
patent: 4613025 (1986-09-01), Despres
patent: 4751991 (1988-06-01), Naudin
patent: 5301782 (1994-04-01), De Briel et al.
patent: 5321878 (1994-06-01), Schierling et al.
Brazier Claude
Hagnere Raymond
Bonck Rodney H.
Valeo
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