Abstract: Methods and systems are provided for controlling camshaft phasers of a variable displacement engine. In one example, the engine includes first and second cylinder banks, with the engine being configured to operate in a rolling variable displacement mode. The camshaft phasers are torque actuated camshaft phasers, and a controller of the engine may adjust operation of camshaft phasers at the first cylinder bank differently than camshaft phasers at the second cylinder bank.

Abstract: A turboprop engine assembly for an aircraft, including an internal combustion engine having a liquid coolant system, an air duct in fluid communication with an environment of the aircraft, a heat exchanger received within the air duct having coolant passages in fluid communication with the liquid coolant system and air passages air passages in fluid communication with the air duct, and an exhaust duct in fluid communication with an exhaust of the internal combustion engine. The exhaust duct has an outlet positioned within the air duct downstream of the heat exchanger and upstream of an outlet of the air duct, the outlet of the exhaust duct spaced inwardly from a peripheral wall of the air duct. In use, a flow of cooling air surrounds a flow of exhaust gases. A method of discharging air and exhaust gases in an turboprop engine assembly having an internal combustion engine is also discussed.

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: A valve train assembly includes at least a number of exhaust valves; at least one camshaft with at least a pair of a primary lift cam and an engine brake lift cam. A number of rocker arms each include a cam follower for following one of the primary lift cam and the engine brake lift cam. One rocker arm includes a cam follower following an engine brake lift cam. The rocker arm is provided with an engine brake capsule. Various biasing assemblies are disclosed that cooperate with one of the rocker arms of which the cam follower follows an engine brake lift cam to accommodate mechanical lash.

Abstract: A hydraulically variable gas exchange valve train for an internal combustion engine is proposed that includes a hydraulic housing with a pressure chamber, a pressure relief chamber, and a vent duct. The vent duct is connected hydraulically on a housing inner side via a restriction to the pressure relief chamber, and opens on the housing outer side below the pressure relief chamber with regard to a direction of gravity. The vent duct opens into a hydraulic reservoir, wherein the vent duct opening lies below a normal level of the hydraulic reservoir with regard to the direction of gravity.

Abstract: A rocker arm includes an outer arm having a first wall surface, a second wall, and a third wall surface together forming a lock member channel. An inner arm selectively pivots relative to the outer arm about a pivot axis. A lost motion spring biases the inner arm to pivot relative to the outer arm in a first direction about the pivot axis. A lock member is located within the lock member channel which moves along a lock member axis between a coupled position which prevents the inner arm from pivoting about the pivot axis and a decoupled position which permits the inner arm to pivot relative to the outer arm. A lock member retainer is spaced apart from, and opposed to, the third wall surface such that the lock member is captured between the lock member retainer and the third wall surface.

Abstract: A valve control device for controlling the stroke of a valve of a combustion engine includes: a first body part and a second body part, co-axially arranged, rotatably arranged relative to each other and axially displaceable between a first axial relative position and a second axial relative position; a spring for urging the first body part and the second body part away from each other; wherein the first and second body part have both axial surfaces facing each other and provided with cams evenly distributed along the circumference of the axial surface and wherein the pitch of the cams on both axial surfaces is equal; and a locking pin arranged in axial direction through the first body and extending on both sides, wherein one end of the locking pin extends through a cam.

Abstract: 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.

Abstract: An apparatus includes a ball plunger post and a valve stem post extending upward from a base, the ball plunger post having a size and a shape of a hydraulic lift adjuster (HLA) of a predefined engine, and the valve stem post having a size and a shape of a valve stem of the predefined engine. The apparatus includes a fixture sized and shaped to receive a switching rocker arm assembly, the switching rocker arm assembly having a first end for pivoting and a second end for latching, and a latch with a latch pin fitting into a latch bore and a latch seat. The apparatus includes a latch rod for positioning within the latch bore to rest upon the latch seat, the latch rod having a hardness higher than that of the latch seat and a same diameter as the latch pin, and adapted for coining the latch seat.

Abstract: A variable valve train with at least two functionally identical gas-exchange valves per cylinder, having primary cam and a secondary cam generated valve strokes that are transmitted by a switchable cam follower selectively to the gas-exchange valves. The respective cam follower has a primary lever in tapping contact with the primary cam and in switching contact with the gas-exchange valve and a secondary lever that is in tapping contact with the secondary cam and is coupleable with the primary lever by a control pin. The respective control pins are connected by connecting elements to respective first and second elongated switching elements, which are arranged above the cam followers parallel to the camshaft and are displaceable longitudinally by a linear actuator from a home into a switched position. The control pins of the cam follower of functionally identical gas-exchange valves are in switching connection with a respective one of the first and second elongated switching elements for common movement.

Abstract: A rocker arm includes a body having a first wall and a second with a central opening provided therebetween, the first wall having a first aperture extending therethrough and the second wall having a second aperture extending therethrough. An inner follower within the central opening selectively reciprocates along a reciprocation axis relative to the body, the inner follower extends through the first aperture and the second aperture. A lost motion spring biases the inner follower to move relative to the body along the reciprocation axis in a first direction. A lock member is moveable along a lock member axis between a coupled position which prevents the inner follower from moving past a predetermined position in a second direction which is opposite of the first direction and a decoupled position which permits the inner follower to move past the predetermined position in the second direction.

Abstract: A camshaft adjusting system (1) is provided for a first camshaft (2) and a second camshaft (3) which are arranged concentrically with respect to one another, the second camshaft (3) being arranged within the first camshaft (2). A vane-cell type hydraulic camshaft adjuster (4) is configured for adjusting the first camshaft (2) and an electric camshaft adjuster (5) is configured for adjusting the second camshaft (3). A front cover (7) which is fastened to a stator (6) of the hydraulic camshaft adjuster (4) and which closes off the camshaft adjuster (4) at a side facing away from the camshaft has an internal toothing (8) for supporting a flex pot (9) which is attached to the second camshaft (3) and which is designed for receiving torque from the electric camshaft adjuster (5). A camshaft adjusting unit having the camshaft adjusting system (1) and two camshafts (2, 3) is also provided.

Abstract: A cylinder head assembly is for an internal combustion engine. The cylinder head assembly includes a cylinder head and first and second valves coupled to the cylinder head. The first and second valves are associated with a combustion chamber partially defined by the cylinder head. The cylinder head assembly also includes a fixed member coupled to the cylinder head and a valve bridge engageable with the first and second valves. The valve bridge is axially moveable along an axis relative to the fixed member to move the first and second valves together between an open position and a closed position. The cylinder head assembly further includes an anti-rotation feature between the valve bridge and the fixed member. The anti-rotation feature restricts rotational movement of the valve bridge about the axis.

Abstract: A tappet assembly for use in translating force between a camshaft lobe and a fuel pump assembly via reciprocal movement within a tappet cylinder having a guide slot. The tappet assembly comprises a tappet body defining a pair of apertures and a pair of seats, and a follower assembly. The follower assembly has a shaft, a first bearing and a second bearing, each supported on the shaft for engaging the camshaft lobe. An intermediate element is further supported on the shaft between the first and second bearings and has a platform for engaging the fuel pump assembly. The intermediate element is at least partially disposed in the pair of seats of the tappet body and the shaft is disposed in the pair of apertures of the tappet body.

Abstract: A driven rotational body rotates relative to a driving rotational body to change a rotational phase therebetween and brings its driven-side stopper wall into contact with a driving-side stopper wall of the driving rotational body in the relative rotational direction. The planetary gear performs a planetary motion while being meshed with the driving rotational body and the driven rotational body to change the rotational phase. The driving rotational body includes a gear member, a cover member, and a fastening member. The gear member has the driving-side stopper wall and is meshed with the planetary gear. The cover member covers an accommodation space, in which the driven rotational body and the planetary gear are accommodated, together with the gear member. The fastening member axially fastens the gear member with the cover member.

Abstract: A variable valve mechanism includes a first member and a second member which are disposed between a cam and a valve, a switch pin that is displaced to connect and disconnect the first member to and from the second member, and a displacement device. The displacement device includes a ring-shaped plate that is fitted on a camshaft of the cam so as to be co-rotatable with the camshaft and slidable in a longitudinal direction of the camshaft and that has one side surface configured to contact the switch pin and has the other side surface including a tapered surface formed so that a plate thickness increases toward a rotational direction, and a support device formed by a support pin and a moving device that moves the support pin to a position where the support pin contacts the tapered surface and a position not contacting the tapered surface.

Abstract: A continuously variable valve duration (CVVD) system includes an electronic control unit (ECU) configured to output a command for adjusting an actuator and a controller configured to determine a operation range of a control shaft of the actuator and adjust the control shaft in the determined operation range based on the command of the ECU. The controller positions the control shaft at a predetermined target phase and determines a control state of each target phase based on a target phase value transmitted from the actuator when the control shaft is positioned at the target phase.

Abstract: A camshaft phaser includes a stator defining a cavity and configured to receive power from an engine crankshaft. The phaser further includes a rotor supported within the cavity and rotatable relative to the stator. The rotor has a first face, a second face, and a first hole extending from the first face to the second face. A target wheel of the phaser has a plate portion configured to be read by a camshaft-position sensor and a hub portion seated on the first face. The hub portion defines a second hole that is aligned with the first hole. A pin extends through the first and second holes to rotationally align and secure the target wheel to the rotor.

Abstract: A switchable lever is provided that includes an outer lever, an inner lever pivotably mounted to the outer lever, and a coupling assembly capable of selectively locking the inner lever to the outer lever. The coupling assembly is arranged to be actuated from either a first side or a second side of the switchable lever. The coupling assembly can have one or more push pins and a coupling pin that is arranged to be actuated by the one or more push pins. An actuated end of the coupling pin can be formed with a receiving land that is configured to engage a cam form on a second end of the one or more push pins.

Abstract: A spiral spring (5) has an inner circumferential end (5a) fixed to a rotor (3) and an outer circumferential end (5b) fixed to a plate (8) of a housing (2), and biases the rotor (3) in one direction with respect to the housing (2). A projection (13) protrudes from the plate (8), and stops radially outward expansion of an outermost winding (5c) of the spiral spring (5). A clip (6) has a first portion (6a) coming in contact with the outermost winding (5c) of the spiral spring (5), and is attached to the projection (13) by elastic force of the clip (6).