Abstract: An hydraulic valve actuator for actuating a gas-exchange valve in a combustion cylinder of an internal combustion engine has an operating piston delimiting two pressure chambers, of which the lower pressure chamber acting in the valve-closing direction is permanently charged with fluid pressure via which an intake and return line can be charged by, or relieved of, fluid pressure. To brake the gas-exchange valve in the final phase of the closing procedure to reduce the set-down speed, the return line of the upper pressure chamber is split between two discharge openings, which are connected to one another and arranged in the housing with axial clearance, the upper discharge opening being coupled to a restrictor and the lower discharge opening being displaceable relative to the operating piston and disposed in its displacement path such that it may be closed thereby at a defined distance, prior to reaching its upper limit position.

Abstract: A valve actuator for actuating a gas exchange valve of an internal combustion engine, having a sleeve-shaped positioning piston, which is connected to a valve shaft, having at least two shell-shaped wedge parts, enclosing a shaft end of the valve shaft, on whose radial outer peripheral surface a section shaped like a conical casing is implemented and which are axially connected on their inner side to the shaft end in a form-locked and rotatable manner, the valve actuator having a separate threaded sleeve, which has a threaded connection to the positioning piston or a component connected to the positioning piston and also axially clamps the wedge parts to a conical clamp sleeve via their section shaped like a conical casing.

Abstract: A hydraulically controlled actuator for actuation of an exhaust-side gas exchange valve of an internal combustion engine, containing a control piston that is displaceable within a cylinder and, with piston sides facing away from one another, delimits pressure chambers, of which the one pressure chamber impinges upon the gas exchange valve in the closing direction and the other pressure chamber impinges upon the gas exchange valve in the opening direction. In the actuator is provided at least one spring element, which can be brought into a preloaded state by the control piston moving in the closing direction of the gas exchange valve, and whose stored potential energy accelerates the gas exchange valve in the opening direction at least at the beginning of an opening phase, is provided. This results in a reduction in the energy expended in the context of valve actuation.

Abstract: A hydraulic actuator for gas exchange valves of internal combustion engines is disclosed, in which the lifting of the gas exchange valve from the valve seat is effected with great force. The opening motion of the gas exchange valve then ensues at reduced force. Upon closure of the gas exchange valve, the gas exchange valve is braked before striking the valve seat, so that operation of the gas exchange valve with little wear and little noise can be achieved.

Abstract: The present invention is directed to a cylinder-piston drive, in particular an hydraulically controlled actuator (1) for actuating a gas-exchange valve (2) of an internal combustion engine, which has an operating piston (8) that is displaceable inside a cylinder (6) and delimits pressure chambers (10, 12) by piston sides (14, 16) facing away from one another, the operating piston (8) having a multipart design and being made up of at least two partial pistons (18, 20) that are placed inside one another, are displaceable relative to each other and strike against one another at stop faces (36, 38).

Abstract: A cylinder head (10) for a combustion cylinder of an internal combustion engine is described, which has at least one inlet opening and at least one outlet opening, as well as gas exchange valves (11) which are operable by electrohydraulic valve actuators (15) which as inlet valves (111) control the at least one inlet opening and as outlet valves (112) control the at least one outlet opening. For the purpose of premanufacturing a compact, complete module which, as a separate component, may be tested for reliability and may be installed into the engine block of the internal combustion engine without additional preassembly effort, there is present at cylinder head (10) at least one high pressure rail (37) for supplying fluid under high pressure, and at least one recycling rail for recycling fluid, which have coupling openings (39, 40) for the hydraulic coupling of the valve actuators (15), and also means for fastening the valve actuators (15) are provided (FIG. 1).

Abstract: The invention relates to a valve mechanism with a variable valve opening cross section for use in an internal combustion engine and having a gas exchange valve acted on by the force of a valve spring and displaceable axially back and forth inside a guide by a valve control unit; the position of the sealing slide relative to the gas exchange valve in the axial direction is continuously variable by means of an adjusting unit. A sealing slide disposed coaxially to the gas exchange valve, is acted upon by the force of a coupling spring, and is displaceable axially back and forth by the valve control unit. The position of the sealing slide is variable in the axial direction relative to the gas exchange valve by means of an adjusting unit.

Abstract: A device for restoring a rotary member into a defined normal position, with a spatially stationary fixed catch, which predetermines the normal position, and a driver catch, which is coupled to the rotary member and can be moved past the fixed catch, each of which has stop surfaces embodied on each of its opposing sides, and with a clamping spring, which encompasses the catches in a prestressed fashion with two bent spring legs, in order to prevent a rotary play between the clamping spring and the catches in the normal position, and an elastic spring element in at least one leg section of the spring legs extending across the stop surfaces of the catches, which spring element is supported against the associated stop surface with a spring force that is less powerful than the prestressing force of the clamping spring.

Abstract: A device for controlling at least one gas-changing valve (10) of an internal combustion engine includes a valve adjuster (20) with an adjusting piston (16) limiting two pressure chamber (17, 18). The lower pressure chamber (18) is permanently acted upon by fluid pressure and the upper pressure chamber (17) can be interchangeably pressurized or depressurized with the fluid pressure. The braking of the adjusting piston (16) before reaching its upper end position affecting the closing position of the gas-changing valve, the return (22) of the upper pressure chamber (17) is divided into at least two axially spaced run-off openings (221, 222), of which the lower run-off opening (222) can be closed by the adjusting piston (16) and the upper run-off opening (221) is connected with the lower run-off opening (222) via a throttle opening (23) controllable in an opening cross section.

Abstract: A device for controlling an opening cross section in the combustion cylinder of an internal combustion engine is provided, the device having a gas exchange valve integrated into the combustion cylinder and having an actuator which drives the valve element to execute a closing stroke and an opening stroke. A valve brake which is active during a residual closing stroke of the valve element is provided for the purpose of reducing the impact velocity of the valve closure member of the valve element on the valve seat in the closing stroke of the valve element. The valve brake has a hydraulic damping element with a fluid displacement volume which flows out through a throttle cross section of a throttle opening, and a control unit for controlling the throttle cross section as a function of the viscosity of the displacement volume.

Abstract: A connection between a shaft end of a gas exchange valve of an internal combustion engine and a sleevelike actuating piston of a valve actuator, has at least two shell-like key pieces, surrounding the shaft end and on whose radially outer circumferential surface there is a conically tapering portion, pointing away from a combustion chamber of the engine, and extending in complementary fashion to the cone angle of a radially inner conical portion of a conical fastening sleeve that includes the key pieces, and the conical fastening sleeve and the key pieces can be braced axially against one another. Protrusions and recesses engaging one another are provided on the radially inner circumferential surface of the key pieces and on the radially outer circumferential surface of the shaft end of the gas exchange valve. The conical fastening sleeve is formed by the actuating piston and the actuating piston and the key pieces have threaded portions that can be screwed into one another.

Abstract: An hydraulically controlled actuator (16) for activating a valve (10) is proposed, especially for activating a gas-exchange valve (10) in a combustion cylinder (11) of an internal combustion engine, which includes two fluid-filled pressure chambers (21, 22) having controllable chamber volumes and a movable operating piston (18) which delimits the pressure chambers (21, 22) by piston sides facing away from one another, the operating piston (18) acting upon the valve (10) and having an effective closing area acted upon by fluid pressure in the pressure chambers (21, 22) to close the valve (10) and an effective opening area acted upon by the fluid pressure to open the valve (10). To influence the kinematics of the opening and closing movement of the valve (10), the operating piston (18) is designed such that the surface area of at least one of the two effective areas changes along the sliding path of the operating piston (18).

Abstract: The invention relates to a valve mechanism with a variable valve opening cross section, in which the valve mechanism is disposed at an admission opening of an internal combustion engine and has a gas exchange valve, which is acted on by the force of a valve spring and is displaceable axially back and forth inside a guide by a valve control unit; the position of the sealing slide relative to the gas exchange valve in the axial direction is continuously variable by means of an adjusting unit.

Abstract: A hydraulic actuator for gas exchange valves of internal combustion engines is proposed, in which the lifting of the gas exchange valve from the valve seat is effected with great force. The opening motion of the gas exchange valve then ensues at reduced force. Upon closure of the gas exchange valve, the gas exchange valve is braked before striking the valve seat, so that operation of the gas exchange valve with little wear and little noise can be achieved (FIG. 1).

Abstract: An internal combustion engine having at least one combustion cylinder that includes a combustion chamber provided with gas-exchange valves, and an electrohydraulic valve control device having valve actuators that actuate the gas-exchange valves. To reduce manufacturing costs and/or the installation space required for the electrohydraulic valve control device, at least two synchronously controlled gas-exchange valves are connected using a coupling element to a common valve actuator, and the connection sites of the gas-exchange valves are flexibly formed on the coupling element.

Abstract: A device for controlling at least one gas-changing valve (10) of an internal combustion engine includes a valve adjuster (20) with an adjusting piston (16) limiting two pressure chamber (17, 18). The lower pressure chamber (18) is permanently acted upon by fluid pressure and the upper pressure chamber (17) can be interchangeably pressurized or depressurized with the fluid pressure. The braking of the adjusting piston (16) before reaching its upper end position affecting the closing position of the gas-changing valve, the return (22) of the upper pressure chamber (17) is divided into at least two axially spaced run-off openings (221, 222), of which the lower run-off opening (22) can be closed by the adjusting piston (16) and the upper run-off opening (221) is connected with the lower run-off opening (22) via a throttle opening (23) controllable in an opening cross section.

Abstract: An apparatus for controlling gas exchange valves of an internal combustion engine is disclosed, which have hydraulic valve actuators (11) each assigned to one gas exchange valve, with one adjusting piston (13) acting on the gas exchange valve and two hydraulic work chambers (121, 122) defined by the adjusting piston (13), of which chambers the first work chamber (121), acting on the gas exchange valve (10) in the closing direction, is constantly filled with fluid that is under pressure, and the second work chamber (122), acting on the gas exchange valve (10) in the opening direction, can be filled with and relieved of fluid that is under pressure in alternation via a first and second electrical control valve (24, 25; 26, 27).

Abstract: The invention relates to an electrohydraulic valve controller, in particular for controlling a gas exchange valve in internal combustion engines, having a hydraulically actuatable control valve, whose including a control valve piston which can be acted upon, via electrically actuatable valves, by a hydraulic medium that is under pressure, and a hydraulically acting valve brake is assigned to the control valve piston. It is provided that the The valve brake (46) includes a temperature compensation for the hydraulic medium.

Abstract: The invention relates to a valve mechanism with a variable valve opening cross section, in which the valve mechanism is disposed at an admission opening of an internal combustion engine and has a gas exchange valve, which is acted on by the force of a valve spring and is displaceable axially back and forth inside a guide by a valve control unit; the position of the sealing slide relative to the gas exchange valve in the axial direction is continuously variable by means of an adjusting unit.

Abstract: A connection between a shaft end of a gas exchange valve of an internal combustion engine and a final control element of a valve actuator, with at least two shell-shaped wedge-shaped pieces, surrounding the shaft end and braced on the final control element, whose radially outer circumferential surface extends conically and which are surrounded by at least one conical clamping sleeve whose radially inner circumferential surface extends complimentary to the cone angle of the wedge-shaped pieces, wherein on the radially inner circumferential surface of the wedge-shaped pieces and on the radially outer circumferential surface of the shaft end of the gas exchange valve, protrusions and recesses that mesh with one another are provided.