192 clutches and power-stop control – Vortex-flow drive and clutch – With additional drive or clutch
Reexamination Certificate
2005-02-01
2005-02-01
Bonck, Rodney H. (Department: 3681)
192 clutches and power-stop control
Vortex-flow drive and clutch
With additional drive or clutch
C074S733100, C192S003300, C192S003330, C192S003630
Reexamination Certificate
active
06848548
ABSTRACT:
Hydraulic control system for a vehicle transmission connected to an output shaft from a hydraulic torque converter (1) with a hydraulically operated disc clutch for locking the torque converter and which has two hydraulically operated disc clutches for shifting. The control system has a low pressure circuit (30) with a low-pressure pump feeding fluid through the torque converter, and a high pressure circuit (34) with a high-pressure pump (35), which feeds fluid via valves (38) to the disc clutches. The high-pressure pump has variable displacement, which is regulated by the operating pressure of the disc clutch of the torque converter, so that the high-pressure pump is set to a lower displacement when this last-mentioned clutch is engaged than when it is disengaged.
REFERENCES:
patent: 4262554 (1981-04-01), Ahlen et al.
patent: 4819430 (1989-04-01), Becker
patent: 4846765 (1989-07-01), Sakai
patent: 4898050 (1990-02-01), Sakai
patent: 5065645 (1991-11-01), Nagase et al.
patent: 5573473 (1996-11-01), Asayama et al.
patent: 6250180 (2001-06-01), Legner et al.
Bonck Rodney H.
Volvo Lastvagnar AB
Young & Thompson
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