Zf Sachs Ag

Volkswagen Ag

Zf Friedrichshafen Ag

Jochen Kuhstrebe

Wolfgang Kundermann

Axel Rohm

Thomas John

Rainer Reuthal

Olaf Moseler

Thomas Strasser

Jörg Sudau

Hans-Jürgen Schneider

Eduard Steiner

Wolfgang Reisser

Thomas Wirth

Thomas Busold

Wolfgang Grosspietsch

Reinhard Feldhaus

Angelika Ebert

Andreas Orlam&uuml;nder

Markus Heiartz

Michael Peterseim

Paul Kraus

Manfred Zimmer

Rainer Brand

John Thomas

J&uuml;rgen Dudenh&ouml;ffer

Hans-J&uuml;rgen Schneider

A motor vehicle includes a drive train having a drive unit, a gearbox having a first gearbox input shaft and a second gearbox input shaft, and a clutch having a first clutch device which is associated with the first gearbox input shaft, and a second clutch device which is associated with the second gearbox input shaft, for transferring torque between the drive unit and the gearbox. The first and second clutch devices are plate clutches to which an operating fluid, such as a cooling oil, is supplied to operate the same. The gearbox is associated with an actuator device and a control device for controlling the actuator device, the arrangement of which enables the gears associated with the first and second gearbox input shafts to be engaged and disengaged. The control device is designed such that at least one gear is automatically engaged by the actuator device, as a result of the clutch release of the vehicle.

Motor vehicle comprising a drive train having a multiple clutch drive

A power train for a motor vehicle is configured with a control unit operable to increase or decrease the flow of operating fluid as a function of the instantaneous demand for the supply of the operating fluid to at least one of multiple clutch arrangements in such a way that the control unit decreases or interrupts the flow of operating fluid when the supply demand is low and increases the flow of operating fluid unit when the supply demand is high.

A dual clutch gearbox for a motor vehicle comprising a first gearbox input shaft () with which at least one first gear is associated, and a second gearbox input shaft () with which at least one second gear is associated. An outer gearbox input shaft () embodied as a hollow shaft surrounds an inner gearbox input shaft (), and a synchronization device is provided inside the gearbox. The synchronization device comprises at least one planetary gear set () and an associated braking device (), the planetary gear set being arranged with its sun gear, planet carrier and internal ring gear, essentially coaxially in relation to the gearbox input shafts (), and a first component () selected from the sun gear, the planet carrier and the internal ring gear is coupled or can be coupled to the first gearbox input shaft () for the purpose of rotational engagement; a second component () is coupled or can be coupled to the second gear box input shift () for the purpose of rotational engagement, and a third component () can be braked by the brake device () of the synchronization device, which is supported or can be supported, directly or indirectly, on a gearbox housing.

Synchronization device for a dual clutch gearbox based on at least one planetary gear set, and corresponding dual clutch gearbox

A power train for a motor vehicle includes a drive unit, a gearbox having first and second input shafts, and a clutch having first and second multi-disk clutch arrangements assigned to respective input shafts for transferring torque between the drive unit and the gearbox. An operating fluid, especially a cooling oil, is supplied to the clutch arrangements for operation under action of the fluid. An actuator arrangement is assigned to the gearbox for engaging and disengaging gears assigned to the first and second input shafts, and a control unit controls the actuator arrangement so that at least one gear is automatically engaged when the clutch is released.

A clutch system includes a clutch device for positioning in a drive train between a drive unit and a transmission, and an actuating unit for hydraulically actuating the clutch device by means of at least one hydraulic slave-cylinder. The actuating unit has a hydraulic-medium delivery device for delivering a pressurized hydraulic medium, and a valve assembly, whose mediation allows the hydraulic medium to be supplied to and discharged from the slave-cylinder. The valve assembly comprises at least one supply valve, located in a hydraulic connection, between the hydraulic-medium delivery device and the slave-cylinder and at least one discharge valve, which is separate from the supply valve and located in a hydraulic connection, between the slave-cylinder and a hydraulic-medium reservoir.

Hydraulically operated clutch system

In either a pull-mode operating state or a push-mode operating state, a clutch arrangement assigned to the first gearbox input shaft and a clutch arrangement assigned to the second gearbox input shaft are actuated in such a way and a torque-generating arrangement comprising a drive unit is controlled in such a way that, when a shift is to be made between a first gear assigned to a first gearbox input shaft and a second gear assigned to a second gearbox input shaft, at least one of the following criteria with respect to the shifting sequence comprising the shift in question is fulfilled: (1) during the shifting sequence, the torque present at the gearbox output shaft is at least approximately constant or changes monotonically; (2) during the shifting sequence, the vehicle accelerates in an essentially monotonically increasing or in an essentially monotonically decreasing manner.

Method for the operation of a multiple clutching device and a power shift transmission

A rotary driving insertion connection, particularly for transmitting torque in a drivetrain of a motor vehicle between components or units of the drivetrain which are connected or are to be brought into a connection for transmitting torque, comprises a primary-side coupling area at a first component and a secondary-side coupling area at a second component. One of the coupling areas has a cutout which is defined by an inner circumference or at least an inner circumferential portion, and the other coupling area has at least one projecting portion having an outer circumference or at least an outer circumferential portion which is inserted or can be inserted into the cutout axially with reference to an axis of rotation in order to provide a positive rotary driving engagement between the inner circumference and the outer circumference. A plurality of coupling elements producing the positive rotary driving engagement is provided between the inner circumference and the outer circumference.

Rotary driving insertion connection, particularly for transmitting torque in a drivetrain of a motor vehicle

A control unit associated with the cooling fluid supply switches the flow of cooling fluid on or off by controlling the cooling fluid supply in the course of a respective shifting process in which the transmission is shifted up from a lower gear to a higher gear or in down from a higher gear to a lower gear to deliberately exert inertial forces on at least one of the plate carriers by means of the flow of cooling fluid and, therefore, to act on this plate carrier in an accelerating or decelerating manner or in order to deliberately prevent inertial forces of this type being exerted on at least one of the plate carriers by the flow of cooling fluid.

Clutch system with at least one multiple-plate clutch arrangement

A dual clutch arrangement including two clutch areas, each with a pressure plate connected to a housing arrangement for rotation in common around an axis of rotation (A) and which can be shifted in the axial direction with respect to the housing; and a clutch disk, the friction surface areas of which can be clamped between the respective pressure plate and an opposing support arrangement. Each of the clutch disks is designed to be connected nonrotatably to a different power takeoff element. In addition a clutch cooling arrangement, through which a coolant can flow, is installed adjacent to the clutch areas.

Multi-disk clutch arrangement

A clutch system includes a clutch device with at least one clutch arrangement for installation in a motor vehicle drive train between a drive unit and a transmission. The at least one clutch arrangement is actuated by a slave cylinder using a pressure medium which is supplied to the clutch device by a first pump. A further medium is also supplied to the clutch device by a second pump arrangement as an operating medium used during operation of the clutch device. The further medium is selectively supplied as a pressure medium to the slave cylinder.

Growing community of inventors

Westheim, Germany

Jochen Kuhstrebe