Hydrokinetic Coupling Device Having A Pre-Defined Head Loss In An Axial Conduit Peripheral To The Piston
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United States of America Patent
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Issued Date -
Apr 24, 2008
app pub date -
Apr 20, 2005
filing date -
Apr 21, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a hydrokinetic coupling device (10) consisting of a case (12) and a lockup clutch (18) comprising a piston (20) which can move axially in relation to the case (12) between an engaged position, in which the piston is applied against an annular transverse face of the case (12), and a disengaged position at a distance from the transverse face of the case (12). According to the invention, the piston (20) is delimited radially by a convex peripheral face (20e) and the case (12) comprises an opposing inner concave face, said two faces radially defining an essentially-annular axial conduit (30). The invention is characterised in that the rotating surfaces (20e, 17i) of the piston (20) and the case (12) are shaped such that the value of the head loss experienced by the fluid circulating in the annular conduit (30) is pre-determined as a function of the axial position of the piston (20) in relation to the case (12).
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