Patent application number | Description | Published |
20080214353 | Hydraulic system for controlling a belt-driven conical-pulley transmission - A hydraulic system for controlling a belt-driven conical-pulley transmission of a motor vehicle, wherein the transmission has a variably adjustable transmission ratio. The hydraulic system includes a first valve arrangement to control a contact pressure in the belt-driven conical-pulley transmission, a second valve arrangement to control the transmission ratio of the belt-driven conical-pulley transmission, and a hydraulic energy source to supply the hydraulic system with hydraulic energy. In order to provide an improved hydraulic system, the system includes a third valve arrangement for controlling a forward clutch and a reverse clutch, and for controlling a parking lock. | 09-04-2008 |
20080220935 | Hydraulic system for controlling a belt-driven conical-pulley transmission - A hydraulic system for controlling a belt-driven conical-pulley transmission of a motor vehicle, wherein the transmission has a variably adjustable transmission ratio. The hydraulic system includes a first valve arrangement to control a contact pressure in the belt-driven conical-pulley transmission, a second valve arrangement to control the transmission ratio of the belt-driven conical-pulley transmission, and a hydraulic energy source to supply the hydraulic system with hydraulic energy. In order to provide an improved hydraulic system, the system includes a third valve arrangement for controlling a forward clutch and a reverse clutch. | 09-11-2008 |
20080227594 | Hydraulic system for controlling a belt-driven conical-pulley transmission - A hydraulic system for controlling a belt-driven conical-pulley transmission of a motor vehicle, wherein the transmission has a variably adjustable transmission ratio. The hydraulic system includes a first valve arrangement to ensure a contact pressure in the belt-driven conical-pulley transmission, a second valve arrangement to control the transmission ratio of the belt-driven conical-pulley transmission, and a hydraulic energy source to supply the hydraulic system with hydraulic energy. In order to provide an improved hydraulic system, the system a third valve arrangement for controlling a forward clutch and a reverse clutch. | 09-18-2008 |
20080227595 | Hydraulic system for controlling a belt-driven conical-pulley transmission - A hydraulic system for controlling a belt-driven conical-pulley transmission of a motor vehicle having a variably adjustable transmission ratio, and having an electrical actuation system for overall control of the hydraulic system, and a hydraulic parking lock-release system to control a parking lock. In order to provide an improved hydraulic system, the parking lock includes a self-retention system in the event of an electrical power failure. | 09-18-2008 |
20090026394 | Volume flow regulating valve for a hydraulic system for controlling a belt-driven conical-pulley transmission - A volume flow regulating valve for a hydraulic system for controlling a belt-driven conical-pulley transmission. The valve includes a control piston with a pressure surface and an oppositely facing pressure return surface. A supply segment is associated with the pressure surface, and a cooler return segment is connectable with the supply segment by a control edge of the control piston. A pressure return segment is associated with the pressure return surface, and a pressurizing segment is situated between the cooler return segment and the pressure return segment. | 01-29-2009 |
20090029813 | Pressure relief valve for a hydraulic system - A pressure relief valve for a hydraulic system for controlling a belt-driven conical-pulley transmission. The valve includes an orifice having an opening to admit a stream of a hydraulic medium, and a valve cone to block the opening in the orifice. A spring is carried by the valve cone to apply a restoring force to press the valve cone against the orifice in sealing contact with the opening. A hydraulic plate having a valve bore is provided to receive and guide the valve cone and the spring. A lateral force support is carried by the valve cone to align the axis of the valve cone relative to the axis of the orifice opening. | 01-29-2009 |
20090038305 | Hydraulic system for an automatic transmission - A hydraulic system for an automatic transmission operatively connected to an internal combustion engine that is operable in a start-stop mode. The hydraulic system includes a hydraulic energy source to supply the hydraulic system with hydraulic energy, the hydraulic energy source including at least one electrically driven hydraulic pump to supply the hydraulic system with hydraulic energy during a stopping phase of the internal combustion engine. To achieve a reduction in fuel consumption and CO | 02-12-2009 |
20090065728 | Valve Block - The invention relates to a valve block, in particular a hydraulic valve block, which comprises a basic body having a base area and a plurality of blind holes, in particular valve bores, and lamellae, having a plurality of valve actuating devices, in particular electromagnets, and having a plurality of connections, in particular hydraulic connections. The invention is distinguished by the fact that the basic body has an encircling sealing surface, running obliquely relative to the base area, for a protective hood, in particular an oil pan. | 03-12-2009 |
20090145292 | Hydraulic System for controlling a belt-driven conical-pulley transmission - A hydraulic system for controlling a belt-driven conical-pulley transmission. A pump draws a working medium from a working medium tank or through a cooler return valve from a cooler return line. The cooler return valve is a minimum pressure valve that holds closed a connection between the cooler return line and a pump inlet line through the cooler return valve, as long as the pressure in the cooler return line remains below a specified minimum pressure. The cooler return valve also opens the connection between the cooler return line and the pump inlet line through the cooler return valve as soon as the specified minimum pressure in the cooler return line is exceeded. | 06-11-2009 |
20090170657 | Hydraulic supply system for a hydraulically actuated automatic transmission - A hydraulic supply system for a hydraulically actuated automatic transmission, in particular for a belt-driven conical-pulley transmission. The system includes a primary pump driven by a primary drive system to provide pressure in a supply line connected to a regulating valve. The supply line is connected through a pilot valve to a control line in which a control valve is situated, with which the pressure that determines the setting of a transmission ratio adjusting valve is set. An auxiliary pump driven by an auxiliary drive system that is separate from the primary drive system includes an outlet line connected to the control line through a first valve that opens in the direction of the control line, and is connected to the supply line through a second valve that opens in the direction of the supply line. | 07-02-2009 |
20090175742 | Hydraulic supply system for a motor vehicle - A hydraulic supply system for a motor vehicle includes an internal combustion engine, a pump driven by the internal combustion engine, and a hydraulically operated component that is driven by hydraulic fluid transported by the pump. An electric motor is provided to drive the pump when the internal combustion engine is not running. | 07-09-2009 |