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1. (WO2018158227) TURBINE-PISTON FOR HYDROKINETIC TORQUE CONVERTER AND METHOD OF OPERATION

Pub. No.:    WO/2018/158227    International Application No.:    PCT/EP2018/054766
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Wed Feb 28 00:59:59 CET 2018
IPC: F16H 45/02
Applicants: VALEO EMBRAYAGES
Inventors: DURHAM, Patrick
YIN, Xuexian
JEON, GyuBong
DEPRAETE, Alexandre
GODIN, Neil
Title: TURBINE-PISTON FOR HYDROKINETIC TORQUE CONVERTER AND METHOD OF OPERATION
Abstract:
A hydrokinetic torque converter including a secondary piston for purposes of enhancing operation of the lock-up feature, and the method of operating such a converter. The secondary piston moves axially behind the turbine-piston to urge respective lock-up clutch friction surfaces into phased engagement. In an initial phase of engagement, friction surfaces between the secondary piston and turbine- piston engage to begin the reduction of relative rotary motion between the converter impeller and turbine-piston. This initial phase of slowing relative movement between the impeller and turbine-piston reduces pressure within the torus and the associated fluid forces separating the friction surfaces of the lock-up clutch. The secondary piston also slows and eliminates fluid flow from within the torus past the lock-up clutch and further reduces engagement resistance of the lock-up clutch owing to the lessening fluid pressure and flow. A more consistent lock-up clutch engagement, with higher torque capacity, is provided in both driven and coasting lock-up operation.