A valve train device, in particular for an internal combustion engine, includes at least one camshaft which has at least one cam element with at least one multi-track cam. The cam element is provided to be axially displaced by a maximum displacement path. The valve train device further includes a limiting mechanism which is provided to limit in at least one operating state the displacement path of the cam element to a switching path of the switching operation.

The present disclosure relates to a method for braking of an internal combustion engine, in particular a four-stroke internal combustion engine. The method involves a partial opening of at least one gas discharge valve of at least one cylinder of the internal combustion engine during a compression stroke of the internal combustion engine. The method involves a holding of a partial opening of the at least one gas discharge valve during an expansion stroke of the internal combustion engine following the compression stroke and during an exhaust stroke of the internal combustion engine following the expansion stroke. The method involves a closing of the partly opened at least one gas discharge valve at the end of the exhaust stroke or during an intake stroke of the internal combustion engine following the exhaust stroke.

A camshaft may include a shaft as well as a sliding element that is disposed on the shaft such that the sliding element is axially displaceable along a shaft axis. The shaft may comprise an external tooth for transmitting torque between the shaft and the sliding element. The external tooth may engage a mating tooth geometry formed in a passage of the sliding element. The sliding element on its axial end faces may comprise bearing collars that with the shaft form radial supporting bearings of the sliding element on the shaft. Further, the shaft may comprise cylindrical bearing portions for forming the radial supporting bearings, wherein the bearing portions can be configured with a diameter that is smaller than a diameter circumscribed by tips of the mating tooth geometry that protrude into the passage of the sliding element.

The disclosure concerns a variable valve train for an internal combustion engine, comprising a camshaft, a gas exchange valve and a cam carrier. The cam carrier is arranged rotationally fixedly and axially displaceably on the camshaft and has a first cam and a second cam. The variable valve train has a force transmission device with a force transmission element, in particular a finger follower or rocker arm, which, depending on an axial position of the cam carrier, creates an active connection either between the first cam and the gas exchange valve or between the second cam and the gas exchange valve. The variable valve train has a first actuator for axial displacement of the cam carrier, wherein the first actuator is received at least partially in the force transmission device.

A rotary valve seal for a coolant control valve is provided that offers improved sealing with a rotary valve body. The rotary valve seal includes a central axis, a cylindrical seal body, and a seal skeleton. The cylindrical seal body has a first stiffness and a first end that is configured with a radially outwardly extending flange. The seal skeleton, having a second stiffness and embedded within the cylindrical seal body, has a plurality of fingers circumferentially arranged within the flange. The second stiffness can be greater than the first stiffness. The plurality of fingers and flange can define alternating stiffness zones. The first end of the seal body and the flange define a bottom surface configured for sealing engagement with a rotary valve body. The rotary valve body can be shaped in the form of at least one spherical segment.

A system and method for sensing a camshaft barrel position of a sliding camshaft includes at least one sliding camshaft having at least one camshaft barrel and at least one position shifting slot disposed in the at least one camshaft barrel. At least one actuator is provided for engaging the at least one position shifting slot on the rotating sliding camshaft and shifting position of the at least one camshaft barrel and at least one sensor is provided for detecting the shifted position of the at least one camshaft barrel wherein the camshaft barrel includes position identifying features.

A valve train device for an engine includes: a shaft portion; a cam element portion which is mounted on the shaft portion; and an operation member. The cam element portion includes a first end surface cam and a second end surface cam. Each of the first end surface cam and the second end surface cam includes a lift portion. The operation member includes a first operation member and a second operation member. The first operation member causes the cam element portion to move in a first direction, and the second operation member causes the cam element portion to move in a second direction. The first end surface cam includes a first slope portion, and guides the first operation member radially outwardly; and a displacement allowing portion which is formed adjacent to the first slope portion, and allows relative displacement between the first operation member, and the cam element portion.

A sliding camshaft is provided which may include a base shaft, an over-molded trigger wheel, and a distal axially movable structure. The distal axially movable structure may further include a distal journal in addition to at least one standard journal and lobe packs. A control groove is defined in the distal axially movable structure. The over-molded trigger wheel is mounted on the distal axially movable structure. The over-molded trigger wheel is operatively configured to move between at least a first position and a second position together with the distal axially movable structure via engagement between the control groove and an actuator. The over-molded trigger wheel may be press fitted on distal axially movable structure and is adapted to accurately communicate with a sensor regardless of the position of the distal axially movable structure.

A cam follower for operable attachment to a valve lifter assembly for use with a variable cam lobe camshaft in a variable valve timing system includes a housing with a central cavity and a mushroom head with a stem pivotably connected to the housing in the central cavity, the mushroom head having a radiused surface for contacting a cam lobe surface. The cam follower is used in combination with a variable cam surface of an axially displaceable camshaft to obtain improvements in idling speed and volumetric efficiency.

A multiple variable valve lift apparatus includes a first moving cam, the first moving cam provided to rotate together with the camshaft and move in an axial direction of the camshaft, a plurality of cams realizing different valve lifts relative to each other, a second moving cam provided to rotate together with the camshaft and move in an axial direction of the camshaft, and forming a second cam guide protrusion and a plurality of cams realizing different valve lifts relative to each other, a first operating unit, a second operating unit, a controller, and a valve opening/closing unit, wherein at least two pins are respectively disposed at the first operating unit and the second operating unit so as to guide the first cam guide protrusion and the second cam guide protrusion, and an interference preventing pin formed to have a relatively large diameter in comparison with the other pin.