A variable camshaft timing device adjusts phase between a camshaft and a crankshaft and includes a first ring gear configured to connect to the camshaft and rotate about a center axis, having a plurality of radially-inwardly facing gear teeth; a second ring gear axially spaced from the first ring gear, configured to receive rotational input from the crankshaft and rotate about the center axis, having a plurality of radially-inwardly facing gear teeth; a planetary gear assembly including one or more planet gears that are configured for rotation by an electric motor and engage the first ring gear and the second ring gear through the planet gear(s); and a cushioned stop configured to transmit energy between the planetary gear assembly and a planetary gear stop attached to a sprocket or a camshaft plate.

A continuously variable valve timing apparatus may include a camshaft, a first and a second cam portions having two cams formed thereto, of which the camshaft is inserted thereinto, and of which relative phase angles with respect to the camshaft are variable. First and second inner brackets transmit rotation of the camshaft to the first and second cam portions respectively. First and second slider housings having first and second inner brackets are rotatably inserted thereinto, respectively, and have relative positions with respect to the camshaft that are variable. A cam cap rotatably supports the first and second cam portions together with a cylinder head, and the slider housings are slidably mounted thereto. A control shaft is disposed parallel with the camshaft and selectively moves the first and the second slider housings, and a control portion selectively rotates the control shaft so as to change positions of the inner brackets.

A variable valve timing control device includes a connection mechanism provided with a coupling member which connects a driving-side rotation member and an input gear with each other, the connection mechanism including a first engagement portion and a second engagement portion, the first engagement portion engaged with the driving-side rotation member so as to be relatively displaceable therewith in a first radial direction, the second engagement portion engaged with the input gear so as to be relatively displaceable therewith in a second radial direction which is orthogonal to the first radial direction, and a biasing member restricting a coupling member from being displaced.

Systems and methods for varying a rotational relationship between a cam shaft and a crank shaft on an internal combustion engine (i.e., cam phasing) are provided. In particular, systems and methods are provided that facilitates a rotary position of a first component to be accurately controlled with a mechanism causing a second component, which can be coupled to the cam shaft or crank shaft, to follow the rotary position of the first component.

A variable cam phaser system including a variable cam phaser and a vibration damper fixed to the variable cam phaser is disclosed. A method for damping vibration for a variable cam phaser is also disclosed. The method includes providing a variable cam phaser, providing a vibration damper, and fixing the vibration damper to the variable cam phaser.

Systems and methods for varying a rotational relationship between a cam shaft and a crank shaft on an internal combustion engine (i.e., cam phasing) are provided. In particular, systems and methods are provided that facilitates a rotary position of a first component to be accurately controlled with a mechanism causing a second component, which can be coupled to the cam shaft or crank shaft, to follow the rotary position of the first component.

The present disclosure provides systems and methods to compensate for backlash within a cam phasing system. For example, compensating for backlash by commanding a predetermined amount of additional actuator movement to account for backlash within a cam phaser. According to some aspects, a spring is provided within a cam phaser to unidirectionally take up the backlash within the cam phasing system.

An engine may include an electric continuously variable valve timing apparatus for adjusting opening timing of an intake valve provided at a cylinder head, and a continuously variable valve duration apparatus for adjusting duration of exhaust valve provided at the cylinder head.

A variable camshaft timing device adjusts phase between a camshaft and a crankshaft and includes a first ring gear configured to connect to the camshaft and rotate about a center axis, having a plurality of radially-inwardly facing gear teeth; a second ring gear axially spaced from the first ring gear, configured to receive rotational input from the crankshaft and rotate about the center axis, having a plurality of radially-inwardly facing gear teeth; a planetary gear assembly including one or more planet gears that are configured for rotation by an electric motor and engage the first ring gear and the second ring gear through the planet gear(s); and a cushioned stop configured to transmit energy between the planetary gear assembly and a planetary gear stop attached to a sprocket or a camshaft plate.

A valve train for an engine of a motor vehicle and an engine assembly with such a valve train is provided. The valve train includes at least two inlet and/or outlet valves, and at least two motorized actuating units configured to independently control the maximum valve lifts of respective ones of the valves. A first actuating unit of the at least two actuating units is associated with a first valve of the at least two valves, and a second actuating unit is associated with a second valve of the at least two valves.