Abstract:
The invention relates to a transmission for a motor vehicle having a rotatable transmission element arranged in a first section of the transmission; a store of liquid arranged in a second section of the transmission separate from the first section; a collection device for liquid thrown off by the transmission element having a return passage through which a first portion of the thrown off liquid can be returned to the first transmission section and an outlet to supply a second portion of the thrown off liquid back to the liquid store; and a passage for the liquid which connects the liquid store to the first transmission section and which has a temperature-controlled restrictor element functioning to inhibit the inflow of liquid from the liquid store into the first transmission section when a fluid temperature in the first transmission section falls below a temperature threshold value.
Abstract:
A vehicle drive train includes a first power disconnection device and a first driveline for transferring torque to a first set of wheels. A second driveline for transferring torque to a second set of wheels includes a differential gearset having an output coupled to a second power disconnection device. A hypoid gearset is positioned within the second driveline in a power path between the first and second power disconnection devices. The second power disconnection device includes a clutch having a first set of clutch plates fixed for rotation with the differential gearset output. The clutch further includes a second set of clutch plates fixed for rotation with a shaft adapted to transfer torque to one of the wheels of the second set of wheels. A valve limits a flow of coolant to the clutch when the second power disconnection device operates in a disconnected mode.
Abstract:
A vehicle drive train for transferring torque to first and second sets of wheels includes a first driveline adapted to transfer torque to the first set of wheels and a first power disconnection device. A second driveline is adapted to transfer torque to the second set of wheels and includes a second power disconnection device. A hypoid gearset is positioned within one of the first driveline and the second driveline in a power path between the first and second power disconnection devices. The hypoid gearset is selectively disconnected from being driven by the first driveline and the second driveline when the first and second power disconnection devices are operated in a disconnected, non-torque transferring, mode. At least one of the first and second power disconnection devices includes an active dry friction clutch.
Abstract:
The invention relates to a friction clutch having a single-acting actuator which is a piston-cylinder unit and is connected in a controllable fashion to a pressurized fluid source. In order to be able to carry out a fast pilot stroke up to the point at which the clutch makes contact, the piston-cylinder unit has a stepped piston whose first step of small diameter delimits, by means of its cylinder, a first pressure space, and whose second step of relatively large diameter delimits, by means of its cylinder, a second pressure space, a pressure line being connected to the first pressure space and, by means of a first non-return valve which opens at a certain pressure, to the second pressure space, and it also being possible for the second pressure space to be connected via a discharge line and a suction line, which contains a second non-return valve, to the fluid reservoir. The invention also relates to a drive device having clutches of said type.
Abstract:
A coupling arrangement for a drive train of a motor vehicle includes at least one clutch arranged on a rotating shaft in order to couple the rotating shaft selectively with a drive element of the drive train, and at least one activation device to activate the clutch. The activation device is adapted to bring an engagement segment selectively into engagement with a threaded segment rotating with the shaft in order to cause a relative movement of the engagement segment and the threaded segment along the axis of the rotating shaft and thus activate the clutch in the axial direction.
Abstract:
A transfer case arrangement may include a first output shaft, a second output shaft, a clutch, a shutdown device, a lubrication device, and a control. The clutch may distribute a torque between the output shafts. The shutdown device may shut down the second output shaft when the clutch is disengaged. The lubrication device may lubricate the clutch and/or another component of the transfer case arrangement. The lubrication device may include an oil conveying device for conveying lubrication oil. The control may activate the oil conveying device periodically when the second output shaft is shut down.
Abstract:
A vehicle drive train includes a first power disconnection device and a first driveline for transferring torque to a first set of wheels. A second driveline for transferring torque to a second set of wheels includes a differential gearset having an output coupled to a second power disconnection device. A hypoid gearset is positioned within the second driveline in a power path between the first and second power disconnection devices. The second power disconnection device includes a clutch having a first set of clutch plates fixed for rotation with the differential gearset output. The clutch further includes a second set of clutch plates fixed for rotation with a shaft adapted to transfer torque to one of the wheels of the second set of wheels. A valve limits a flow of coolant to the clutch when the second power disconnection device operates in a disconnected mode.
Abstract:
A torque transmission unit having a friction clutch and a hydraulic actuation system. The hydraulic actuation system includes a stepped piston unit having a stepped piston which has a first piston section movable in a first pressure space and a second piston section movable in a second pressure space. The first pressure space and a portion of the second pressure space can be brought into fluid communication by means of an overflow line based on a position of the first piston section. The hydraulic actuation system also includes an actuation piston unit having an actuation piston that cooperates with the friction clutch. A third pressure space is associated with the actuation piston and is in fluid communication with the second pressure space via a pressure line.
Abstract:
The invention relates to a powertrain for a motor vehicle having a permanently driven primary axle, comprising: a drive unit for the generation of a drive torque; a first clutch for the transfer of a variable portion of the drive torque to a secondary axle of the motor vehicle; a second clutch for the deactuation of a torque transfer section of the powertrain arranged between the first clutch and the second clutch when the first clutch is opened; and a control unit for the automatic control of the first clutch, with the control unit being connected to at least one sensor for the detection of a wheel slip at the primary axle; with the control unit being made, starting from a deactuated state of the torque transfer section, to close the second clutch in dependence on a detected wheel slip at the primary axle.
Abstract:
A method and control apparatus for the generation of a setting signal for an actuator of a clutch unit of a motor vehicle with which the torque to be transmitted by the clutch unit can be set. A desired value for the torque to be transmitted is determined by a main control unit in dependence on predetermined first parameters. A setting signal for the actuator corresponding to the desired value is generated by an additional control unit on the basis of the determined desired value. A desired value tolerance range for the determined desired value of the torque is determined by the main control unit in dependence on predetermined second parameters. The desired value tolerance range is transmitted to the additional control unit, with the additional control unit determining an actual value of the torque transmitted or transmissible by the clutch unit and generating a new setting signal for the actuator when the actual value is outside the desired value tolerance range.