Abstract: This disclosure relates to a hydraulic support element for a switchable rocker arm of a valve train of an internal combustion engine. The hydraulic support element includes a cup-shaped cylinder, within which a hollow piston is arranged in an axially displaceable manner. The piston includes a filter cartridge which is in the form of a hollow body and can be charged from the outside with pressurized oil and an interior space of which is connected to an outlet opening of the contact head. An interior space of the piston has two pressurized oil chambers, including a first pressurized oil chamber above the piston head and connected to a first pressurized oil feed, and a second pressurized oil chamber formed under the contact head and connected to a second pressurized oil feed. The filter cartridge is tubular and located in the second pressurized oil chamber.

Abstract: A beam-like crosshead for a valve train of an internal combustion engine is proposed for the transmission of a cam lift to two gas exchange valves. The crosshead has two side walls which are connected by a transverse wall, and, on an upper side of the transverse wall at its longitudinal center, a contact surface for a cam follower, and, on an underside of the transverse wall at each of its longitudinal ends, a valve contact surface. The crosshead is a reversed bowl-like hollow body which is produced from steel sheet using stamping/bending technology. From the transverse wall the side walls and, transversely at each longitudinal end, end walls hang in a finger-like manner. Cut edges between the side and end walls, starting from the transverse wall, form cut-outs.

Abstract: A layer system includes at least one bonding layer and a plurality of functional layers arranged on the at least one bonding layer. Each functional layer has a first nanolayer of a first metal nitride with a first metal constituent, and a metallic second nanolayer. Each functional layer has a layer thickness d in a range of 1 to 100 nm.

Abstract: A method for producing a reduced friction sliding surface on a machine element includes applying a coating comprising amorphous carbon to a surface of the machine element and locally heating the coating with a laser. The coating is heated to a temperature below an evaporation temperature of the coating to achieve a local volumetric increase in the coating and a local increase in a layer thickness of the coating. A surface structure of the coating includes a multiplicity of elevations resulting from a local phase transformation of the coating from amorphous carbon into graphite due to the locally heating.

Abstract: A method for producing a reduced friction sliding surface on a machine element includes applying a coating comprising amorphous carbon to a surface of the machine element and locally heating the coating with a laser. The coating is heated to a temperature below an evaporation temperature of the coating to achieve a local volumetric increase in the coating and a local increase in a layer thickness of the coating. A surface structure of the coating includes a multiplicity of elevations resulting from a local phase transformation of the coating from amorphous carbon into graphite due to the locally heating.

Abstract: This disclosure relates to a hydraulic support element for a switchable rocker arm of a valve train of an internal combustion engine. The hydraulic support element includes a cup-shaped cylinder, within which a hollow piston is arranged in an axially displaceable manner. The piston includes a filter cartridge which is in the form of a hollow body and can be charged from the outside with pressurized oil and an interior space of which is connected to an outlet opening of the contact head. An interior space of the piston has two pressurized oil chambers, including a first pressurized oil chamber above the piston head and connected to a first pressurized oil feed, and a second pressurized oil chamber formed under the contact head and connected to a second pressurized oil feed. The filter cartridge is tubular and located in the second pressurized oil chamber.

Abstract: A layer system includes at least one bonding layer and a plurality of functional layers arranged on the at least one bonding layer. Each functional layer has a first nanolayer of a first metal nitride with a first metal constituent, and a metallic second nanolayer. Each functional layer has a layer thickness d in a range of 1 to 100 nm.

Abstract: A lever-type cam follower for a valve train of an internal combustion engine, the cam follower having two side walls which are connected to each other through a crossbar on whose underside, on one end, a support for a gas exchange valve is disposed, the crossbar having a recess through which a roller extends, the roller is supported via a bearing on a pin seated in the side walls, wherein the roller is so narrow that outer front ends of the roller are clearly spaced from and out of contact with longitudinal surfaces of the recess, one guide extension projects from each of the longitudinal surfaces towards a central longitudinal plane of the cam follower, and the roller is guided on inner sides of the at least one guide extension.

Abstract: A valve drive of an internal combustion engine, having a finger lever which acts at one end on a gas exchange valve and which is seated at the other end on a head of a housing of a support element, which housing runs in an axially movable manner in a reception bore of a cylinder head, the finger lever is acted on by a cam from the base circle from which there projects in a fixed manner an additional cam piece for generating an additional lift of the gas exchange valve, a bore extends from a bottom of the housing in the direction of the head, in the lower portion of which bore there runs a pressure piston which is axially movable relative to the housing and via the lower face of which the support element is mounted on a base of the reception bore of the cylinder head, a high-pressure chamber for hydraulic medium is formed between an upper face of the pressure piston and a ring part situated above said upper face and which is fixed with respect to the housing, and to generate the additional lift, the high-press

Abstract: An internal combustion piston engine based on a four-stroke process, including a crankcase in which at least one cylinder/piston assembly is arranged, the piston being guided by a connecting rod connected to a crankshaft. At least one cylinder head closes the cylinder, each of whose intake and exhaust channels are controlled by at least one intake valve and one exhaust valve (13, 13a). The intake and exhaust valves (13, 13a) are actuable by a rocker arm (5) or a finger lever driven by a camshaft (1) through intake and exhaust cams (2). The rocker arms or finger levers are guided on at least one axle (6). A brake control device is provided which includes, in the region of the base circle of the exhaust cam (2), at least one additional cam (1) for an additional opening of at least one of the exhaust valves (13, 13a).

Abstract: A valve drive of an internal combustion engine, having a finger lever which acts at one end on a gas exchange valve and which is seated at the other end on a head of a housing of a support element, which housing runs in an axially movable manner in a reception bore of a cylinder head, the finger lever is acted on by a cam from the base circle from which there projects in a fixed manner an additional cam piece for generating an additional lift of the gas exchange valve, a bore extends from a bottom of the housing in the direction of the head, in the lower portion of which bore there runs a pressure piston which is axially movable relative to the housing and via the lower face of which the support element is mounted on a base of the reception bore of the cylinder head, a high-pressure chamber for hydraulic medium is formed between an upper face of the pressure piston and a ring part situated above said upper face and which is fixed with respect to the housing, and to generate the additional lift, the high-press

Abstract: According to the invention this object is attained by a rocker arm for actuating at least one gas exchange valve of an internal combustion engine having an elongated lever body with a floor and with side walls angled away therefrom, wherein a first end section of the lever body has a cup formed in the floor for a support element, and in that a section near the center is provided with a cam engagement surface and in that a second end section of the lever body has a bottom contact surface for a valve stem end of the gas exchange valve, wherein a crossbar extends between the section near the center and the second end section, and wherein the bottom contact surface for the valve stem end has a first stamping toward the top side of the rocker arm for a direct fine enclosure of the valve stem end, and wherein the crossbar has a second stamping whose shape is matched to the valve stem end.

Abstract: A lever-type cam follower for a valve train of an internal combustion engine, the cam follower having two side walls which are connected to each other through a crossbar on whose underside, on one end, a support for a gas exchange valve is disposed, the crossbar having a recess through which a roller extends, the roller is supported via a bearing on a pin seated in the side walls, wherein the roller is so narrow that outer front ends of the roller are clearly spaced from and out of contact with longitudinal surfaces of the recess, one guide extension projects from each of the longitudinal surfaces towards a central longitudinal plane of the cam follower, and the roller is guided on inner sides of the at least one guide extension.

Abstract: A reciprocating-piston internal combustion engine which operates on the four-stroke cycle, having a crankcase and having at least one cylinder which is arranged in said crankcase and in which a piston is guided by a crankshaft, having at least one cylinder head which closes off the cylinder and the intake and exhaust channels which are controlled by at least in each case one intake and exhaust valve loaded by a valve spring, which intake and exhaust valves can be actuated by transmission elements driven by a camshaft, and having a hydraulic valve play compensating element (5) which is installed in at least one of the transmission elements or in a component, which is installed in the transmission element, between the camshaft and at least one intake and/or exhaust valve, which hydraulic valve play compensating element has a working piston (8), a cylinder housing (7) which interacts with the working piston (8), a restoring spring (18) which is installed in between, and a check valve which delimits a high-pressu

Abstract: A rocker or swing arm in a valve train of an internal combustion engine has a bearing bore pivotally supporting the arm on a hollow axis located in a fixed position in the engine. The valve train has a camshaft with cams for causing the arm to pivot. A hydraulic valve lash compensation element that acts on the tappet of a gas exchange valve connects to the arm. A supply line is arranged in the arm, and a radial opening connecting the hollow interior space of the axis to the supply line is arranged in the axis in the region of the arm to deliver hydraulic means through the hollow axis to the lash compensation element. According to the invention, a A labyrinth seal (35) surrounding the hollow axis without contact is arranged on the arm at each axial end of the bearing bore. The bearing space of the arm is laterally sealed by this means.

Abstract: An internal combustion piston engine based on a four-stroke process, having a crankcase in which at least one cylinder/piston assembly is arranged, the piston being guided by a connecting rod connected to a crankshaft. At least one cylinder head (1) closes the cylinder, each of whose intake and exhaust channels are controlled by at least one intake valve and at least one exhaust valve (2, 2a). The intake and exhaust valves are actuable by a finger lever or a rocker arm driven by a camshaft (12) through intake and exhaust cams. The finger levers or rocker arms are guided on at least one axle (10).

Abstract: An internal combustion piston engine based on a four-stroke process, including a crankcase in which at least one cylinder/piston assembly is arranged, the piston being guided by a connecting rod connected to a crankshaft. At least one cylinder head closes the cylinder, each of whose intake and exhaust channels are controlled by at least one intake valve and one exhaust valve (13, 13a). The intake and exhaust valves (13, 13a) are actuable by a rocker arm (5) or a finger lever driven by a camshaft (1) through intake and exhaust cams (2). The rocker arms or finger levers are guided on at least one axle (6). A brake control device is provided which includes, in the region of the base circle of the exhaust cam (2), at least one additional cam (1) for an additional opening of at least one of the exhaust valves (13, 13a).