Voith Patent Gmbh

Voith Turbo Gmbh Co. Kg

Dieter Laukemann

Achim Menne

Werner Adams

Martin Becke

Werner Klement

Werner Koch

Tilman Huth

Ravi Schade

Thomas Ohr

Markus Kley

Steffen Kämmerer

Mirco Wassermann

Philipp Mueller

Alexander Martin

Benedikt Goth

Achim Neher

Matthias Lehr

Martin Blumenstock

John Patrick Wittmann

Jürgen Kibler

Thomas Geier

Sandra Barthelmäs

Jürgen Betz

Alexander Schreiber

Martin JÄGER

Thomas Vogelgsang

Philipp MÜLLER

Jochen THÖNNIßEN

Andreas-Nicolas Mayer

A drive train has a hydrodynamic retarder including a rotating bladed rotor and bladed stator, forming a working chamber for hydrodynamic transmission of power from rotor to stator, a power input feeding drive power to the retarder, and a synchronized separating clutch connected between power input and rotor. The clutch has two clutch halves, friction elements contacting each other and mechanical blocking elements. The friction elements equalize rotational speed between clutch halves, and the blocking elements form-lockingly connect the clutch halves. The clutch has an actuator displaceable along a displacement travel, over a first distance bringing the friction elements into mutual contact, and a second distance adjoining the first distance to synchronize the friction elements and rotational speed for locking with the blocking elements. At least one displacement sensor directly or indirectly detects displacement travel by the actuator and/or position of the actuator on the displacement travel.

Drive train with a hydrodynamic retarder that can be decoupled and has a displacement sensor

A hydrodynamic retarder having a rotor and a stator or a rotor and an oppositely running rotor, which together form a toroidal working chamber to filled with working medium, in order to transmit a torque by means of a hydrodynamic working chamber working medium circuit. An external working medium circuit has a heat exchanger that discharges heat from the working medium. The external working medium circuit is connected by a working medium inlet and a working medium outlet to the working chamber. The working medium inlet and outlet open to the working chamber at a torus outer diameter of the working chamber. A working medium feed line opens into the external working medium circuit. A core ring filling line is connected in working-medium-conducting fashion to the working chamber. The core ring filling line opens into a core ring of the working chamber radially within the torus outer diameter.

Hydrodynamic retarder

A method for controlling a hydrodynamic machine, including the steps of: providing a hydrodynamic machine which includes a bladed primary wheel and a bladed secondary wheel, which together form a working chamber, which can be filled with a working medium from a working medium supply contained in a working medium reservoir, to transfer drive power hydrodynamically from the bladed primary wheel to the bladed secondary wheel by forming a working medium circuit in the working chamber; applying a control pressure to the working medium supply in order to force the working medium from the working medium supply into the working chamber; detecting, at least indirectly, a pressure increase in the working medium reservoir, when the control pressure is applied to the working medium supply; and determining, as a function of the pressure increase that has been detected, a fill level of the working medium supply in the working medium reservoir.

Method for controlling a hydrodynamic machine and hydrodynamic machine

A method for controlling a hydrodynamic retarder in a motor vehicle that can be mechanically disengaged via a disconnect clutch, whereby at least one of the rotational speed of a revolving bladed rotor and the speed of a motor vehicle is monitored and a disconnect clutch is engaged below at least one of a pre-specified rotational speed of the revolving bladed rotor and a pre-specified speed of the motor vehicle, regardless of a request made by a driver assist system or by operation of an input device by the operator of the motor vehicle to turn on the hydrodynamic retarder.

Method for controlling a hydrodynamic retarder that can be mechanically disengaged by a disconnect clutch

A hydrodynamic machine comprising a housing, arranged within said housing: at least one shaft; a toroidal working chamber that can be filled with a working medium, the toroidal working chamber including a first housing with a first bladed wheel and a second housing with a second bladed wheel; a step-up gear arranged with the first bladed wheel about a common rotational axis and mounted such that they can rotate independently of one another; and a coupling device operable to transfer torque between the step-up gear and the first bladed wheel.

Hydrodynamic machine

A method for controlling a hydrodynamic retarder in a motor vehicle that can be mechanically disengaged via a disconnect clutch, comprising a drive motor whose power output is controlled via an actuator such as a foot pedal or a lever; whereby in an overrun operation the acceleration of the motor vehicle is collected or detected and compared with a pre-specified acceleration value; and whereby in the non-braking mode the disconnect clutch is engaged, regardless of an initiation of a braking mode by an operator of the motor vehicle or a driver assist system and the working chamber is maintained drained when the acceleration exceeds an acceleration limit.

Method for controlling a hydrodynamic retarded that can be disengaged by a disconnect clutch

There is provided a hydrodynamic retarder including a bladed rotor and a bladed stator jointly forming a working chamber to be filled with working medium and discharged therefrom, a working medium container receiving working medium, and a control pressure application system pressurizing the working medium with a control pressure medium to displace the working medium from the working medium container into the working chamber to set a desired braking torque. A centrifugal separator separating the working medium from the control pressure medium, the centrifugal separator is connected in a flow-conductive manner to an outlet of the working medium container for the control pressure medium to be pressurized with the control pressure medium, the centrifugal separator is driven by the pressure of the control pressure medium, and the working medium container is assembled from at least two shells, where the first and/or the second shell encloses the centrifugal separator.

The invention relates to a hydrodynamic retarder comprising&#x2014;a rotor () and a stator () which form a working chamber () with each other;&#x2014;a first working medium connection ();&#x2014;a second working medium connection (); and&#x2014;a working medium container () that has an outlet (), which is connected to the first working medium connection via a line, and an inlet (), which is connected to the second working medium connection via a line; wherein&#x2014;the working medium container is made of two housing parts (), which are joined together along a parting line (). According to the invention:&#x2014;the two housing parts together enclose the working medium storage volume;&#x2014;one of the two housing parts simultaneously forms a part of a retarder housing () which supports or forms the stator and partly forms all or some of the working medium-conducting connections between the working medium storage volume and the working chamber; and&#x2014;a separating plate () is inserted between, the two housing parts, said separating plate together with one or both of the housing parts forming cavities for the working medium-conducting connections and/or the working medium storage volume.

The invention concerns a hydrodynamic retarder The invention is characterised in that the control device when closing the separating clutch detects the run-up behaviour of the secondary side of the separating clutch and/or of the rotor via at least one associated sensor or defines the run-up behaviour from at least one input value supplied thereto and according to the run-up behaviour initiates either the continuous closing of the separating clutch for slip bridging between the primary side and the secondary side for accelerating the rotor or the interruption of the closing process of the separating clutch.

Disconnectable hydrodynamic retarder and method for controlling same

A motor vehicle drive train including a hydrodynamic retarder () that comprises a revolving bladed impeller () and a stationary or counter-rotating bladed turbine () which jointly form a working chamber () that can be filled with a working medium to switch on the retarder () is disclosed. The hydrodynamic retarder () can be mechanically disengaged from the drive train by a disconnect clutch (). A fill level monitoring device () can detect the current fill level of the working medium in the working chamber (), while a disconnect clutch-blocking device () is effectively connected in a communicating or mechanical manner to the fill level monitoring device () and prevents the disconnect clutch () from engaging in accordance with the detected fill level.

Motor vehicle drive train comprising a hydrodynamic retarder that can be disengaged, and control method therefor

There is provided a method for controlling a hydrodynamic retarder. The method includes determining a presence of a retarder switch-off request, and keeping a separating clutch closed, after the determining, for a preset time span and emptying a working chamber of the hydrodynamic retarder of a working medium by continuous actuation of a rotating bladed rotor and interruption of infeed of the working medium into the working chamber. The method further included varying the preset time span according to at least one of the following parameters or at least one parameter correlated with one of the following parameters: a rotational speed of the rotating bladed rotor, an output pressure, against which the working medium is emptied from the working chamber, a filling level of the working chamber with the working medium, a temperature of the working medium, and a braking torque of the hydrodynamic retarder.

Method for controlling a hydrodynamic retarder which can be disengaged mechanically via a separating clutch

A cooling system has a drive motor which is to be cooled by a cooling medium. A cooling medium circuit conducts the cooling medium. A hydrodynamic machine comprising a working space can be filled with a working medium. The working medium is the cooling medium, and the hydrodynamic machine has a seal which is cooled and/or lubricated by the cooling medium. A cooling medium pump for circulating the cooling medium is in the cooling medium circuit. A pick-off is in the cooling medium circuit in the region of the cooling medium pump. Via the pick-off, the cooling medium is branched out of the cooling medium circuit. The branched-off cooling medium is conducted directly through or past the seal to cool and/or lubricate the latter, and the cooling medium which is conducted through or past the seal is supplied to the cooling medium circuit upstream or downstream of the working space.

Cooling system with a drive motor and a hydrodynamic machine

The invention relates to a hydrodynamic machine, in particular a retarder, having an external working medium circuit, comprising: a bladed primary wheel and a bladed secondary wheel which together form a toroidal working chamber which can be filled with working medium from the external working medium circuit, which is fed back into the external working medium circuit; an annular channel disposed outside the working chamber, which is connected in a working-medium conducting manner to the working chamber via outlet holes in the primary wheel or secondary wheel, and is in flow-conducting communication with the external working medium circuit in order to collect working medium leaving the working chamber through the outlet holes and supply this to the external working medium circuit. The invention is characterized by the following features: having at least one tapping opening disposed on or outside the working chamber which is in flow-conducting communication with the working chamber of the hydrodynamic machine and at least one filling channel which opens into a region of relatively low working medium pressure inside the hydrodynamic machine and which is in flow-conducting communication with the working chamber; wherein the at least one tapping opening and the filling channel are interconnected in a working-medium conducting manner by means of a return line outside the external working medium circuit in such a manner that working medium flows from the at least one tapping opening into the filling channel and from there back into the working chamber.

Hydrodynamic machine and method for minimizing the drag power of such a machine

The present invention relates to a hydrodynamic machine, especially a hydrodynamic retarder, including a bladed primary wheel and a bladed secondary wheel which are arranged opposite of each other axially with respect to their blade configurations such that they jointly form a working chamber. The working chamber can be filled with a working medium for one operating state in order to transmit torque from the primary wheel to the secondary wheel by means of a circulatory flow of the working medium. The working chamber can be emptied of the working medium for a non-operating state in order to prevent a transmission of torque from the primary wheel to the secondary wheel. A suction apparatus is connected with a fluidic connection to the working chamber in order to suck off working medium and/or air from the working chamber for forming a negative pressure in the working chamber in the non-operating state.

The invention relates to an automotive drive, comprising a cooling circuit with a coolant, a retarder having a rotor and a stator that together form a toroidal working chamber, with the coolant being the working medium of the retarder. The retarder has an inlet for feeding the working medium from the cooling circuit and an outlet for discharging the working medium into the cooling circuit. The present automotive drive is characterized by the following features: the retarder has an additional evacuation outlet, which communicates with the cooling circuit so as to carry the working medium; a leakage pump is interposed in the connection between the evacuation outlet and the cooling circuit.

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Crailsheim, Germany

Dieter Laukemann