A rocker arm assembly can comprise a main rocker arm and a latch assembly. A latching arm can control the latch assembly and thereby control the extent to which a secondary rocker arm acts on the main rocker arm. The main rocker arm can comprise a main body configured to rotate around a rocker shaft, a valve end extending from the main body, a reaction end extending from the main body, and a latch bore. A bias pin can extend from the main body. The latch assembly can be configured to selectively rotate in the latch bore. The latch assembly can comprise a first latch end comprising a switch plate configured to receive actuation force on a first side and to receive bias force from the bias pin on a second side. A second latch end can comprise a first latch seat and a second latch seat.

A valve train device, in particular for an internal combustion engine, includes a support element and a cam element which can be moved axially relative to the support element. The valve train device further includes a switch unit for axially moving the cam element, which switch unit includes a displacer that is intended to be at least operatively inserted between the support element and the cam element in order to axially move the cam element.

A valve operating system that includes a plurality of cam assemblies that are coupled for rotation about a rotary axis. Each of the cam assemblies has a control link and a first cam member. Each of the control links has a link body, which forms a majority of the control link, and that extends parallel to the rotary axis. Each of the first cam members is coupled to one of the control links for axial movement therewith along the rotary axis between first and second positions to alternate between first and second cam profiles, respectively.

A variable valve gear for a combustion engine includes at least one lift valve and a camshaft, which comprises a first cam and a second cam (20) arranged offset in a longitudinal direction of the camshaft. The variable valve gear further comprises a transmission lever, which is arranged in operative connection between at least the one lift valve and the camshaft for actuating at least the one lift valve. The transmission lever comprises a swivel axis, a mounting and a cam follower (28). The mounting is supported so that it can swivel about the swivel axis. The mounting holds the cam follower (28). The mounting is supported so that it is axially displaceable parallel to the swivel axis and/or parallel to the camshaft, so that the cam follower (28) follows either the cam contour of the first cam or the cam contour of the second cam (20).

A valve drive for an internal combustion engine may include a cam shaft, at least one cam follower, at least one adjusting device, and at least one control shaft. The cam shaft may include at least one cam group that may include a first cam and a second cam The at least one adjusting device may include a first adjustable engagement element and a second adjustable engagement element. The at least one control shaft may include at least one control cam group that may include a first control cam and a second control cam. The first control cam may include a cam lobe corresponding to the first engagement element and the second control cam may include a cam lobe corresponding to the second engagement element. The at least one control shaft may be rotatable about a longitudinal axis between a starting position and a rotational position.

This invention relates generally to a camshaft having dual independent banks of cam lobes which are azimuthally adjustable one with respect to the other over a small angle so as to allow separate control of intake and exhaust valve opening and closing events. Such a coaxial camshaft allows relative changes in the lobe centerline angle, or LCA, to vary the amount of valve overlap during operation. An outer shaft member containing one bank of cam lobes houses an inner shaft containing another bank of cam lobes which protrude and extend radially outward through windows of omitted material in the outer shaft. The concentric shafts containing banks of cam lobes are each a single piece being produced in their final shapes, simultaneously, by metal additive manufacturing, or MAM. The shafts being initially produced concentrically require no individual assembly operation, and are constrained by one another, inextricably bound in the assembled configuration upon their being formed. Furthermore, as exemplified in the invention, the requisite spacing between the inner and outer shafts of the coaxial camshaft may be preserved free of metal by the pre-placement of barrier material, or by placement of a non-metal interlayer during manufacture, as exemplified herein which may subsequently be disintegrated by industrial ultrasonic process to facilitate its removal. In either case, the small annular space having been formed maintains the radial alignment between the inner and outer shafts to within acceptable tolerance, and allows the flow of lubricating oil within the space during operation. Such a camshaft with the addition of a separate cam phasing mechanism may beneficially be fitted to engine blocks with a single traditional camshaft, which would otherwise be made from a single piece of material, with fixed LCA, thereby allowing older designs to be upgraded with fully universal Variable Valve Timing, or VVT.

A variable valve apparatus for an internal combustion engine according to the present invention comprises a cam base member rotating with rotation of a camshaft and a cam lobe member. The cam lobe member is movable to the cam base member, between a projecting position where the cam part radially projects and a retreat position where the cam part is retreated. A resilient member urges the cam lobe member toward the projecting position. A movement control apparatus includes a drive member provided for driving the cam lobe member, and the drive member is fixed to the cam lobe member. When the cam lobe member is in a non-fixing state to the cam base member, the cam lobe member is moved from the projecting position to the retreat position with the drive member being pressed.

A cam system for operating a first engine valve and a second engine valve includes translatable first and a second sliding lobe packs. The first sliding lobe pack operates the first engine valve with one of a high lift lobe, a low lift lobe, and a zero lift lobe. The second sliding lobe operates the second engine valve with one of a high lift lobe or one of two low lift lobes. A shift barrel has a first groove configured to translate the first and a second sliding lobe packs in a first direction, and a second groove configured to translate the first and a second sliding lobe packs in a second direction, opposite the first. A shift actuator has a first pin, a second pin, and a third pin, each selectively actuatable to engage the first groove or the second groove.

A variable valve duration/variable valve lift system may include a camshaft, a first cam portion including a first cam, into which the camshaft is inserted and of which a relative phase angle of the first cam with respect to the camshaft is variable, an inner bracket transmitting rotation of the camshaft to the first cam portion, a slider housing into which the inner bracket is rotatably inserted, a first rocker arm having a first end contacting the first cam, a rocker shaft to which the first rocker arm is rotatably connected, a solenoid valve configured to selectively supply hydraulic pressure, a position controller configured to selectively change a position of the slider housing, a first bridge connected to a second end of the first rocker arm and to which a first valve is connected, and a valve lift disposed within the first bridge.

A valve bridge assembly for an engine includes a main body configured to engage a distal end of at least one valve stem. A receiving body is movably disposed within a cavity of the main body between a first position and a second position. The receiving body includes at least one key-receiver. A piston body is movably attached to the main body and includes a key configured to be received into the key-receiver of the receiving body. When the receiving body is in the first position. the key-receiver feature and key are misaligned and a force applied to the piston body is transmitted to the at least one valve stem via the receiving body and the main body. When the receiving body is in the second position, the key-receiver and the key are aligned and a force applied to the piston body causes the piston body to be displaced relative to the main body.