192 clutches and power-stop control – Clutches – Operators
Patent
1996-10-09
1999-02-02
Bonck, Rodney H.
192 clutches and power-stop control
Clutches
Operators
192 91A, 192 98, F16D 2508, F16D 2314
Patent
active
058652884
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns hydraulically controlled clutch release bearings for a diaphragm clutch, notably for a motor vehicle.
The invention concerns more particularly a clutch release bearing having a fixed portion comprising an outer body and a concentric inner support tube distinct from the outer body, defining a blind annular cavity of axial orientation capable of being supplied with fluid and inside which is mounted an axially movable tubular piston carrying a drive member capable of acting on the diaphragm of a clutch.
Such a bearing is described for example in the document FR-A-2 682 950.
This bearing can be supplied by a fluid of the gaseous or liquid type and this is the reason why it is usually referred to as a hydraulically controlled clutch release bearing.
According to various known designs, means are provided for fixing the inner support tube to a fixed element, for example to the casing of the gearbox equipped with a clutch having such a concentric hydraulically controlled clutch release bearing, and means are also provided for fixing the outer body to this same fixed part, the most precise concentricity possible also having to be ensured between these two elements of the fixed portion of the bearing.
The aim of the present invention is to propose a novel design of a hydraulic bearing which makes it possible to simplify the fixing and relative positioning of the two components of the fixed portion of the bearing.
To this end, the invention proposes a clutch release bearing of the type mentioned above, characterised in that the inner support tube has at its rear end an annular flange of transverse orientation, by means of which it bears on a fixed portion, notably on a gearbox, and in that the rear end of the body in indented in order to clamp the flange between the body and the said fixed portion.
Thus the fixing of the outer body makes it possible simultaneously to ensure the fixing of the inner support tube and to reduce the cost price of the clutch release bearing.
According to other characteristics of the invention: for centering the inner support tube in a fixed portion, such as an aperture produced in the gearbox; outer body; flange; the diameter of the internal bore of the outer body; bore of an aperture produced in a gearbox for its input shaft to pass; the annular flange; outer body; annular flange and the outer body; notably by pressing and/or stamping; tubular portion serving to center a preloading spring acting between the shoulder on the outer body and a shoulder on an annular flange belonging to the piston; forming, prior to the mounting of the clutch release bearing on its fixed part, a unitary assembly.
In general terms, the inner tube can be thinner than in a conventional embodiment.
Other characteristics and advantages of the invention will emerge from the reading of the detailed description which follows, for an understanding of which reference will be made to the accompanying drawings, in which:
FIG. 1 is a view in axial section of a clutch for a motor vehicle fitted with the clutch release bearing according to the invention;
FIG. 2 is a side view of the outer body of the clutch release bearing of FIG. 1;
FIG. 3 is a partial view to a larger scale of the central part of FIG. 1;
FIG. 4 is a partial view of the joining means between the inner tube and the guide sleeve;
FIG. 5 is a partial view in axial section showing the connection means between the inner tube and the guide sleeve.
FIG. 6 is a view similar to that of FIG. 3 which illustrates a second embodiment of the fixing of the inner tube by means of the outer body;
FIG. 7 is a half view similar to FIG. 6 for another example embodiment.
In FIG. 1, a clutch can be seen at 1 having, in succession axially, a reaction plate 10, a friction disc 11, a thrust plate 12, a diaphragm 13 and a cover 14 in the form of a hollow dish.
The reaction plate 10 is designed to be fixed, here by screws, to a driving shaft, not visible, here the crankshaft of the engine of the motor vehicle, and offers up a friction face to the fricti
REFERENCES:
patent: 3004438 (1961-10-01), Funk et al.
patent: 4399898 (1983-08-01), Olschewski et al.
patent: 4561531 (1985-12-01), Young et al.
patent: 4960193 (1990-10-01), Hodge
patent: 5547058 (1996-08-01), Parzefall et al.
patent: 5620076 (1997-04-01), Voit et al.
Giroire Jean-Pierre
Thomire Sylvain
Bonck Rodney H.
Valeo
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