Abstract: The disclosure relates to a variable valve drive of a combustion piston engine with at least one gas exchange valve per cylinder, wherein each valve stroke is specified by a primary and secondary cam and transmitted to the gas exchange valve via a switchable cam follower that includes a primary lever and a secondary lever. The primary lever is in contact with the primary cam, and the secondary lever is in contact with the paired secondary cam and can be coupled to the primary lever by a coupling element. The coupling element includes a coupling pin, a locking pin, and an unlocking pin. Axially outer ends of the locking and unlocking pin protrude out of the secondary lever and are coupled to a shift rod via respective connection elements, the shift rod being longitudinally movable out of a rest position into a shift position by a linear actuator.

Abstract: The disclosure relates to a variable valve drive of a combustion piston engine with at least one gas exchange valve per cylinder, wherein each valve stroke is specified by a primary and secondary cam and transmitted to the gas exchange valve via a switchable cam follower that includes a primary lever and a secondary lever. The primary lever is in contact with the primary cam, and the secondary lever is in contact with the paired secondary cam and can be coupled to the primary lever by a coupling element. The coupling element includes a coupling pin, a locking pin, and an unlocking pin. Axially outer ends of the locking and unlocking pin protrude out of the secondary lever and are coupled to a shift rod via respective connection elements, the shift rod being longitudinally movable out of a rest position into a shift position by a linear actuator.

Abstract: The invention relates to a method for the alternating cylinder shutdown of a three-cylinder or five-cylinder internal combustion engine during partial load operation, in which the opening of the gas exchange valves of the shut-down cylinders is deactivated. The valve deactivation of the shut-down cylinders is intended to begin and end with the deactivation and the subsequent reactivation of the intake valves of said cylinders, in each case at the start of the regular intake cycle of said cylinders.

Abstract: A controllable coolant pump of a cooling circuit for an internal combustion engine, having a pump housing, in which a pump shaft with associated impeller is rotatably arranged. The impeller conveys a coolant as a volume flow via an intake connection in a pressure or spiral channel of the coolant pump. The volume flow can be influenced by a baffle plate which encloses the outside of the impeller, the push rod of the baffle plate being guided in the pump shaft. In connection with an actuator the baffle plate can be continuously adjusted between two limit positions against the force of a spring. A control element, which has an electro-hydraulic action and which is integrated into the pump shaft, serves as an actuator, wherein the pressurized coolant in the coolant pump is provided as a hydraulic fluid.

Abstract: A switchable device for supplying at least one consumer of an internal combustion engine with pressure.

Abstract: A volume accumulator (15), including a guide housing (33) and a separating element (34), wherein the separating element (34) is slidably mounted on an inner lateral face of the guide housing (33). At least one indentation (41) is located on the guide housing (33), with the indentation protruding into the guide housing (33), wherein in the direction of the separating element (34) the indentation (41) has an open end that serves as a stop for the separating element (34).

Abstract: A variable coolant pump for a cooling circuit of an internal combustion engine that has a pump housing in which is mounted a hollow shaft that is driveable by a pulley. At one end of the hollow shaft an impeller is fastened which has vanes projecting into an inlet chamber and which is firmly connected via axial bridges to a cover disc. Through rotation of the impeller together with the cover disc, water can be sucked into the inlet chamber via an inlet connection piece of the pump housing and conveyed by the vanes into an annular passage of the pump housing. A guide disc with a contour corresponding to the impeller is further arranged between impeller and cover disc. The guide disc is guided by the axial bridges and can be displaced axially via a positioning unit by a piston located inside the hollow shaft.

Abstract: A switchable device for supplying at least one consumer of an internal combustion engine with pressure, comprising: a cavity formed inside a camshaft; a first displacement element arranged in the cavity having a first pressure surface which at least partially delimits a first accumulator chamber together with the wall of the cavity; a first energy accumulator which interacts with the first displacement element; a locking mechanism by which the first displacement element can be locked in the second end position; a switching mechanism which can be actuated by an actuator, having a switch element that can be brought into at least two switching positions; a second displacement element arranged in the cavity having a second pressure surface which at least partially delimits a second accumulator chamber together with the wall of the cavity; a second energy accumulator which interacts with the second displacement element; the first accumulator chamber and the second accumulator chamber communicating with each other

Abstract: A roller bearing device in particular in a turbocharger having a housing component having a bearing hole having an inner circumference and a rolling bearing received therein on an outer race having an outer circumference. In order to implement a component such as a rotor assembly of a turbocharger that can rotate on the inner circumference with great smoothness and that is protected against imbalance, a hydraulic damping device made of reservoirs filled with a hydraulic fluid and alternating along the circumference facing the outer periphery and the inner periphery is provided in an annular gap between the outer periphery of the outer race and the inner periphery of the bearing hole by radially pretensioning the outer race relative to the bearing hole.

Abstract: A switchable device for supplying at least one consumer of an internal combustion engine with pressure.

Abstract: A switchable device for supplying at least one consumer of an internal combustion engine with pressure.

Abstract: A volume accumulator (15), including a guide housing (33), a separating element (34) and a spring element (35). The separating element (34) is slidably mounted on an inner lateral face of the guide housing (33) and the spring element (35) is seated against the separating element (34) on one side and on the guide housing (33) on the other side. According to the invention, at least one indentation (47) is provided on the guide housing (33), with the indentation protruding into the guide housing (33). In the direction of the spring element (35), the indentation (47) has an open end against which the spring element (35) is seated.

Abstract: A volume accumulator (15), including a guide housing (33) and a separating element (34), wherein the separating element (34) is slidably mounted on an inner lateral face of the guide housing (33). At least one indentation (41) is located on the guide housing (33), with the indentation protruding into the guide housing (33), wherein in the direction of the separating element (34) the indentation (41) has an open end that serves as a stop for the separating element (34). A volume accumulator (15), including a guide housing (33) and a separating element (34), wherein the separating element (34) is slidably mounted on an inner lateral face of the guide housing (33). At least one indentation (41) is located on the guide housing (33), with the indentation protruding into the guide housing (33), wherein in the direction of the separating element (34) the indentation (41) has an open end that serves as a stop for the separating element (34).

Abstract: A device (1) for regulating a coolant flow in a cooling system of an internal combustion engine (2) with a valve arrangement (3) that includes a rotary disk valve (4) for switching at least one cooling circuit (5, 6) and/or a bypass circuit (7), as well as a coolant pump (8) that is constructed as an impeller pump and is connected on the suction side to the valve arrangement (3). The coolant pump (8) has an axial adjustable guide plate (11) on an inside between two end stops (9, 10) for closing and releasing a pump outlet (12). The guide plate (11) for the axial adjustment is indirectly coupleable by a lead screw thread (13) to a drive shaft (14) of the rotary disk valve (4). A cooling system for an internal combustion engine (2) with such a device (1) is also provided.

Abstract: A controllable coolant pump which has a pump housing. In the pump housing a pump shaft is arranged, which connects a drive wheel to an impeller wheel. In the operating state of the coolant pump, during a rotation of the impeller wheel, coolant is sucked in via a cover disk which is mounted in front of a suction space, and is conveyed into an annular channel of the pump housing. A delivery volume of the coolant pump can be influenced via an actuator which interacts with an axially displaceable guide plate assigned to the impeller wheel. An elastic sealing element is provided for effective sealing of an annular gap which is produced in a functionally required manner between the impeller wheel and the guide plate. The sealing element is inserted in an annular groove of the impeller wheel and is supported sealingly on a cylindrical section of the guide plate.

Abstract: A device for hydraulic control of gas exchange valves of a reciprocating internal combustion engine which has slave cylinders in operative connection with one or more gas exchange valves and master actuators in operative connection with at least one cam provided with a basic and cam profile of a camshaft that is rotatably driven by the engine and can be hydraulically connected to the slave cylinders. The device also has a control device controlled by an actuating member, the device controlling the volume of hydraulic liquid fed to the slave cylinders, and at least one feed line, via which low pressure liquid from a pressure source can be fed to the device by means of at least one non-return valve. The actuators have displaceable vanes, a component carrying the vanes, and cells limited by walls. The vanes are in operative connection with the basic and cam profile of the cam.

Abstract: A variable coolant pump for a cooling circuit of an internal combustion engine, that has a pump housing in which is mounted a hollow shaft that is driveable by a pulley. At one end of the hollow shaft an impeller is fastened which has vanes projecting into an inlet chamber and which is firmly connected via axial bridges to a cover disc. Through rotation of the impeller together with the cover disc, water can be sucked into the inlet chamber via an inlet connection piece of the pump housing and conveyed by the vanes into an annular passage of the pump housing. A guide disc with a contour corresponding to the impeller is further arranged between impeller and cover disc. The guide disc is guided by the axial bridges and can be displaced axially via a positioning unit by a piston located inside the hollow shaft.

Abstract: A device for hydraulic control of gas exchange valves of a reciprocating internal combustion engine which has slave cylinders, in operative connection with one or more gas exchange valves and, master actuators, in operative connection with at least one cam provided with a basic and cam profile of a camshaft that is rotatatly driven by the engine and can be hydraulically connected to the slave cylinders. The device also has a control device controlled by an actuating member, the device controlling the volume of hydraulic liquid fed to the slave cylinders, and at least one feed line, via which low pressure liquid from a pressure source can be fed to the device by means of at least one non-return valve. The actuators have displaceable vanes, a component carrying the vanes, and cells limited by walls. The vanes are in operative connection with the basic and cam profile of the cam.

Abstract: An electromagnetic hydraulic valve (1), which including an electromagnet (2) with an armature (3) and of a valve housing (4) with an axial bore (5) and a piston valve (6) located therein is provided. The valve housing (4) includes several annular grooves (8, 9, 10) in which several radial openings (11, 12, 13) are located, which open into the axial bore (5), through which the hydraulic valve (1) has a fluid connection with a pressure connection (P), a tank connection (T) and two consumer connections (A, B). The piston valve (6) is acted upon by the armature (3) of electromagnet (2) and includes two ring-shaped control sections (14, 15), which connect alternatively the pressure connection (P) and the tank connection (T) with one of the consumer connections (A, B) through axial movement of piston valve (6). According to the invention, the radial openings (11, 12, 13) in valve housing (4) are provided as windows having a rectangular cross section.

Abstract: Directional control valve, in particular a hydraulic 3/2-way directional control valve, having an actuating unit (1) and a valve unit (2), which is operatively connected to the actuating unit and in which a valve element (9), displaceable by the actuating unit (1) and having a tappet (14), controls ducts (4, 5, 6) of the valve unit (2) carrying hydraulic pressure medium, the actuating unit (1) having at least one coil (21), a magnetic core (18), which is arranged at least partially inside the coil (21), is of cylindrical design and has an end-face limit (22), and a moveable armature (15) interacting electromagnetically with the magnetic core (18) and comprising an end face (16), the armature being operatively connected to the tappet (14), the internal dimensions of the magnetic core (18) being larger than the external dimensions of the armature (15) and the magnetic core (18) and the armature (15) being arranged, formed and aligned in conjunction with the length of the tappet (14) so that the end face (16) of