| Patent application number | Description | Published |
|---|
| 20080237996 | Rotary leadthrough, especially for a torsional vibration damper in a drive train of a vehicle - A rotary lead-through includes a first rotary lead-through element having a first channel opening on a first boundary surface, and a second rotary lead-through element having a second channel opening on a second boundary surface which opposite from the first boundary surface and can rotate relative to the first boundary surface about an axis of rotation, the first and second channels being in fluid communication via a channel boundary space. A sealing arrangement acting between the first and second lead-through elements includes at least one sealing stage, each sealing stage including a first sealing element toward the boundary space and a second sealing element away from the boundary space, the first and second sealing elements enclosing a backpressure chamber surrounding the axis of rotation. Where successive sealing stages are provided, a pressure-limiting valve can be provided in parallel to the seal separating immediately successive backpressure spaces. | 10-02-2008 |
| 20090065323 | Hydraulic actuating system for a motor vehicle clutch - A hydraulic actuating system for a shiftable clutch installed in a drive train of a motor vehicle between an internal combustion engine and a transmission, which comprises at least one pressure source to produce a fluid pressure; a slave cylinder operably connected to the pressure source by which a clutch-release element of the vehicle clutch becomes subjectable to an actuating force; and a hydraulic clutch control means. The pressure source is configurable to create a compact and low-cost actuating system such that the maximum fluid pressure which it can produce is lower than that necessary at the slave cylinder to actuate the motor vehicle clutch. In this way, a hydraulic pressure booster becomes provided which can increase the fluid pressure to the level required for the clutch actuation. | 03-12-2009 |
| 20090127040 | Torsional Vibration Damper Arrangement - A torsional vibration damper with a primary side and a secondary side, wherein rotation of the primary side relative to the secondary side causes displacement of hydraulic fluid from at least one displacement chamber and compression of pneumatic fluid in at least one compensating chamber. A first displacement chamber assembly includes a pair of axially opposed end walls bounding each displacement chamber in both axial directions and a circumferential wall bounding it in one radial direction, and a second displacement chamber assembly bounds it in the other radial direction. A sealing arrangement is provided between the end walls and the second displacement chamber assembly to produce an essentially fluid-tight closure of the at least one displacement chamber. | 05-21-2009 |
| 20100300820 | Torsional Vibration Damping System for the Drive Train of a Vehicle - A torsional vibration damper system includes a primary side and a secondary side coupled to the primary side by a damper fluid arrangement for rotation and for relative rotation with respect to one another. The damper fluid arrangement has a first damper fluid which transmits a torque between the primary side and the secondary side and a second damper fluid which is loaded when there is an increase in pressure in the first damper fluid. A rotary feedthrough supplies or removes first damper fluid to or from at least one displacement chamber of the damper fluid arrangement and a pressure fluid generation system for providing first damper fluid to be supplied to the damper fluid arrangement via the rotary feedthrough. The pressure fluid generation system comprises at least two pressure fluid pumps. | 12-02-2010 |
