Ricardo Inc.

Volkswagen Ag

Shaun E Mepham

Cameron Philip Williams

Joseph S VanSelous

Georg Kruse

Rainer Hofmann

Eric Sharkness

Carsten Adomeit

Daniel A Bihn

Lloyd Storey

Jonathan P Brentnall

Felipe V Brandao

A dual clutch transmission (DCT) with double-range change. In one embodiment, the dual clutch transmission includes odd and even lay shafts and a separate range change shaft for each, thereby providing a range change for both the odd and even gear sets. The input shaft may include an extension gear that can be selectively driven by the inner input shaft or the outer input shaft to provide additional gear pairings. The extension gear may include a synchronizer on each face to allow it to be coupled to either the outer or inner input shaft. The transmission may include a reverse shaft coupled with the even lay shaft. The transmission may include a dual half synchronizer having a single hub and a split sleeve. The parts of the split sleeve are separately movable to allow independent synchronization of two pairs of rotating components.

Enhanced dual clutch transmission

A multi-mode hybrid transmission for transmitting power from a prime mover and a stored source of energy to a final drive shaft. The transmission may include an input shaft to receive torque from the prime mover, a countershaft operatively coupled to the final drive shaft, a plurality of gear pairs each defining a torque path from the input shaft to the countershaft, a synchromesh clutch assembly to selectively couple the input shaft with a desired gear pair, and first and second electric machines rotatably carried by the input shaft. The first electric machine can provide a motive force to the final drive shaft and the second electric machine can covert rotary speed of the input shaft into electrical energy. Additionally, the first and second electric machines can provide supplemental torque to the output shaft during periods of reduced torque from the prime mover associated with a change in torque path.

Multi-mode hybrid transmission

A hydraulic circuit for a motor vehicle transmission, preferably a twin-clutch transmission, is connected for cooling at least one clutch of the transmission. The hydraulic circuit is preferably a low-pressure circuit and it includes at least one hydraulic pump, at least one filter element, for filtering the hydraulic oil, and at least one pressure-regulating valve. The circuit-related control sequence and the power consumption of the hydraulic pump are optimized in that at least one adjusting valve is provided in order to control the volume flow of cooling oil flowing to the clutch, in that a pressure-compensation valve is provided in addition, and in that the pressure-regulating valve, the adjusting valve and/or the pressure-compensation valve are arranged and/or formed within the hydraulic circuit such that the pressure difference between the supply pressure and the establishing cooling-oil pressure is essentially constant.

Hydraulic circuit for a transmission of a motor vehicle

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Saline, MI, United States of America

Shaun E Mepham