Abstract:
The invention relates to measures for controlling or reducing drag torque occurring in a multi-plate clutch device (202) due to temperature-related increased viscosity of an operating fluid which is supplied to the plates in operation. The aim of the invention is to enable a motor vehicle to be started or operated even at low temperatures. According to one aspect of the invention, a motor vehicle comprising a drive train is especially provided. Said drive train comprises a drive unit (238), a gearbox (330) having a first gearbox input shaft and a second gearbox input shaft, and a clutch (202) 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. Said clutch devices are embodied in the form of plate clutches to which an operating fluid can be supplied, especially a cooling oil, in order to operate the same. Said gearbox (330) is associated with an actuator device and a control device (316) 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. According to the invention, the control device (316) is designed in such a way that at least one gear is automatically engaged by means of the actuator device (236), as a result of the clutch release of the vehicle.
Abstract:
A multiple coupling device comprising an input hub (40) on the input side thereof, which is coupled to the driven shaft of the drive unit or input shaft which is drivingly connected to the input sides of the coupling devices. Hydraulic paths (430, 424, 426) and operating medium paths (100, 428) are formed in the input hub (40) or in a component (310), which is rotationally fixed in relation to said hub, for hydraulically actuatable coupling devices with integrated hydraulic slave cylinders (56, 58) which rotate during operation or for wet running coupling devices operating under the effect of an operating medium. The slave cylinders are connected to a hydraulic pressure source via said hydraulic paths and by means of at least one hydraulic line (412, 414) guided from a radially outer position or/ and from the drive unit in the direction of the input hub or component. Operating medium can be fed to the coupling devices from an operating medium source via operating medium paths and at least one operating medium line (416) which is guided from a radially outer position or/and from the drive unit towards the input hub or component.
Abstract:
A multiple coupling device comprising an input hub (40) on the input side thereof, which is coupled to the driven shaft of the drive unit or input shaft which is drivingly connected to the input sides of the coupling devices. Hydraulic paths (430, 424, 426) and operating medium paths (100, 428) are formed in the input hub (40) or in a component (310), which is rotationally fixed in relation to said hub, for hydraulically actuatable coupling devices with integrated hydraulic slave cylinders (56, 58) which rotate during operation or for wet running coupling devices operating under the effect of an operating medium. The slave cylinders are connected to a hydraulic pressure source via said hydraulic paths and by means of at least one hydraulic line (412, 414) guided from a radially outer position or/ and from the drive unit in the direction of the input hub or component. Operating medium can be fed to the coupling devices from an operating medium source via operating medium paths and at least one operating medium line (416) which is guided from a radially outer position or/and from the drive unit towards the input hub or component.
Abstract:
A method for operating a drivetrain and a drivetrain (10) with a controller (36), carrying out said method are disclosed. According to one aspect of the invention, at least in one operating state, from a driving operating state, or an overrun operating state for the drivetrain, on switching between a first speed with a first gearbox input shaft (20; 22) and a second speed with a second gearbox input shaft (22; 20), a clutch device (26; 28) on the first gearbox input shaft and a clutch device (28; 26) on the second gearbox input shaft are operated and a torque generation device (12, 50), comprising a drive unit (12) is controlled, such that, at least one of the following criteria is met with relation to a switching process comprising said switching: 1) during the switching process an at least approximately constant or monotonically changing torque is exerted on the gearbox output shaft, 2) during the switching process an essentially monotonically increasing or monotonically decreasing vehicle acceleration is achieved.
Abstract:
A method for operating a drivetrain and a drivetrain (10) with a controller (36), carrying out said method are disclosed. According to one aspect of the invention, at least in one operating state, from a driving operating state, or an overrun operating state for the drivetrain, on switching between a first speed with a first gearbox input shaft (20; 22) and a second speed with a second gearbox input shaft (22; 20), a clutch device (26; 28) on the first gearbox input shaft and a clutch device (28; 26) on the second gearbox input shaft are operated and a torque generation device (12, 50), comprising a drive unit (12) is controlled, such that, at least one of the following criteria is met with relation to a switching process comprising said switching: 1) during the switching process an at least approximately constant or monotonically changing torque is exerted on the gearbox output shaft, 2) during the switching process an essentially monotonically increasing or monotonically decreasing vehicle acceleration is achieved.
Abstract:
The invention relates to a multiple clutch system, optionally a double clutch system (10), for arranging in a drive train of a motor vehicle, between a drive unit and a gearbox. The clutch system comprises a first clutch configuration (20) which is associated with a first gearbox input shaft (16), and a second clutch configuration (24) which is associated with a second gearbox input shaft (18). One (18) of the two gearbox input shafts extends through the other (16). An input side of the clutch system comprises an input hub (40) or an input shaft which is, or can be, directly or indirectly coupled to an output shaft of the drive unit, said hub or shaft being connected to an input side (48) of the first clutch configuration and to an input side (50) of the second clutch configuration in a rotationally engaging manner. For each clutch configuration comprising an integrated, hydraulic slave cylinder (56 and 58) which rotates in operation, at least one hydraulic channel (68, 70) is formed in the input hub (40), by which means at least one of the slave cylinders is, or can be, connected to an associated hydraulic pressure source. For clutch configurations which are provided to operate under the effect of an operating medium, at least one channel (100) for the operating medium is formed in the input hub (40), by which means the operating medium can be supplied to at least one of the clutch configurations, from an operating medium supply.
Abstract:
The invention relates to a clutch system, comprising a clutch device, in particular for positioning in a drive train between a drive unit and a transmission and comprising an actuating unit (200) for hydraulically actuating the clutch device by means of at least one hydraulic slave-cylinder (202). Said actuating unit has a hydraulic-medium delivery device (210, 212) for delivering a pressurised hydraulic medium and a valve assembly (208, 216), whose mediation allows the hydraulic medium to be supplied to and discharged from the slave-cylinder. According to the invention, the valve assembly comprises at least one supply valve (208), located in a hydraulic connection, between the hydraulic-medium delivery device (210) and the slave-cylinder (202) and at least one discharge valve (216), which is separate from the supply valve and located in a hydraulic connection, between the slave-cylinder (202) and a hydraulic-medium reservoir (218).
Abstract:
The invention relates to a clutch system, comprising a clutch device, in particular for positioning in a drive train between a drive unit and a transmission and comprising an actuating unit (200) for hydraulically actuating the clutch device by means of at least one hydraulic slave-cylinder (202). Said actuating unit has a hydraulic-medium delivery device (210, 212) for delivering a pressurised hydraulic medium and a valve assembly (208, 216), whose mediation allows the hydraulic medium to be supplied to and discharged from the slave-cylinder. According to the invention, the valve assembly comprises at least one supply valve (208), located in a hydraulic connection, between the hydraulic-medium delivery device (210) and the slave-cylinder (202) and at least one discharge valve (216), which is separate from the supply valve and located in a hydraulic connection, between the slave-cylinder (202) and a hydraulic-medium reservoir (218).
Abstract:
The invention relates to measures for controlling or reducing drag torque occurring in a multi-plate clutch device (202) due to temperature-related increased viscosity of an operating fluid which is supplied to the plates in operation. The aim of the invention is to enable a motor vehicle to be started or operated even at low temperatures. According to one aspect of the invention, a motor vehicle comprising a drive train is especially provided. Said drive train comprises a drive unit (238), a gearbox (330) having a first gearbox input shaft and a second gearbox input shaft, and a clutch (202) 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. Said clutch devices are embodied in the form of plate clutches to which an operating fluid can be supplied, especially a cooling oil, in order to operate the same. Said gearbox (330) is associated with an actuator device and a control device (316) 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. According to the invention, the control device (316) is designed in such a way that at least one gear is automatically engaged by means of the actuator device (236), as a result of the clutch release of the vehicle.