Abstract: A valve opening and closing timing control apparatus includes a driving-side rotation member, a driven-side rotation member, a phase adjustment mechanism configured as a differential type reduction gear mechanism where an inner gear rotates about a rotation axis while revolving around an eccentric axis which is disposed parallel to the rotation axis in a state where a drive shaft fitted in the inner gear is driven to rotate about the rotation axis, a biasing member provided at an outer periphery of the drive shaft and applying a biasing force to mesh an external teeth portion of the inner gear with an internal teeth portion of the ring gear, and a restriction portion provided at the drive shaft to restrict a displacement of the inner gear in a direction where the inner gear is separated from the ring gear against the biasing force of the biasing member.

Abstract: A camshaft phaser for a concentric camshaft assembly includes a stator defining a cavity and configured to receive power from an engine crankshaft. A rotor is supported within the cavity and is rotatable relative to the stator. A drive adapter has a shank and a head. The shank is extendable through the rotor and is configured to engage with an inner camshaft. The head has an end face defining a first key feature and a continuous groove. A drive plate is fixed to the stator and includes a radial wall defining a second key feature engageable with the first key feature to rotationally fix the drive adapter to the drive plate. An annular gasket is received in the groove and is sealable with the wall.

Abstract: A method of retrofitting a rocker arm assembly for an engine includes removing a first rocker arm assembly from the engine such that a camshaft of the engine remains in the engine. The method also includes providing a second rocker arm assembly that includes a rocker shaft, a rocker arm, a pushrod, and a hydraulic lash adjuster. The rocker arm is connected to the rocker shaft such that the rocker arm can pivot relative to the rocker shaft. The rocker arm has a first end, a second end, and a first oil passage. The pushrod has a top end and a bottom end, in which the top end is connected to the second end of the rocker arm and the bottom end is configured for engaging a camshaft of the engine. The hydraulic lash adjuster includes a housing, a first body member, a second body member, a check valve, and a biasing member. The first body member is disposed in the housing such that a first radial clearance exists between an outer surface of the first body member and an inner surface of the housing.

Abstract: A camshaft phaser or camshaft adjuster for an internal combustion engine is disclosed. The camshaft adjuster includes a rotor, and a stator disposed about the rotor in a slideable engagement such that the stator and the rotor are rotatable relative to each other. A trigger wheel is configured to interact with an associated sensor for detection of an angular speed or position of the trigger wheel. A drive plate is configured to be non-rotatably fixed with an inner camshaft and rotatably coupled to the trigger wheel. In various embodiments, the trigger wheel has an axial face that defines an opening, and the drive plate has a tab with an axially-extending portion extending through the opening in the trigger wheel.

Abstract: A control apparatus of a valve opening/closing timing control mechanism, configured by including driving side and driven side rotating bodies; a stopper unit; and an electric motor, includes: a phase controller controlling an electric motor to reduce, when a target phase is set, a deviation between the target phase and a current first actual phase and reducing power to be supplied to the electric motor as the deviation decreases; and a control target setting unit setting a first target phase displaced to a side of the first actual phase in an operation direction where the deviation is reduced when the target phase is set to a most retarded or most advanced angle phase, in which the phase controller executes a first phase control of reducing a deviation between the set first target phase and the current first actual phase.

Abstract: 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.

Abstract: A control system of a Miller cycle engine includes an ECU. The ECU executes an early closing Miller cycle operating mode in which a variable valve mechanism is controlled to close an intake valve before an intake bottom dead center. The ECU executes a decompression mode in which the variable valve mechanism is controlled to close the intake valve at a point later than the intake BDC, when the engine is started. The electronic control unit executes the early closing Miller cycle operating mode after completion of the decompression mode. A later closing amount of the intake valve relative to the intake BDC, for use in the decompression mode, is larger than an early closing amount of the intake valve relative to the intake BDC when the closing timing of the intake valve is most advanced.

Abstract: An exhaust valve rocker arm assembly selectively opening first and second exhaust valves. The assembly includes an exhaust rocker arm and a valve bridge operably associated with the rocker arm and including a main body and a lever rotatably coupled to the main body. The main body is configured to engage the first exhaust valve, and the lever is configured to engage the second exhaust valve.

Abstract: A camshaft phaser assembly is disclosed. A trigger wheel is provided that includes a position indicator and a first toothing. An input gear includes a second toothing. An output gear is adapted to drive a camshaft, and defines a third toothing. The first toothing and the third toothing have an identical profile. A connection assembly includes a fourth toothing engaged with the first toothing, the second toothing, and the third toothing, such that an input provided by the input gear is transmitted to both the output gear and the trigger wheel, and the trigger wheel and the output gear are driven in unison. A method of detecting a position of a camshaft based on a trigger wheel is also disclosed.

Abstract: Methods and systems are provided for a valve spring retainer of a valvetrain assembly. In one example, valve spring retainer may be at least partially hollowed and include inner cavities forming channels within a material of the valve spring retainer. Air inside the inner cavities may be fluidly coupled to air surrounding the valve spring retainer through channels. A mass of the valve spring retainer may be decreased and a cost and speed of fabrication of the valve spring retainer may be reduced by additive manufacturing.

Abstract: A camshaft phaser, including: a first surface facing in a first axial direction; and a connection portion extending from the first surface in the first axial direction. The connection portion includes a wall with a second surface facing in a second axial direction, a first circumferentially disposed wall connected to the wall, a second circumferentially disposed wall connected to the wall, a first tab directly connected to the first circumferentially disposed wall and the second circumferentially disposed wall and extending radially outwardly past the first circumferentially disposed wall and the second circumferentially disposed wall, and a plurality of connected groove walls extending from the second surface into the wall in the first axial direction and bounding a reinforcing groove in the wall. At least a portion of the plurality of connected groove walls is located between the first circumferentially disposed wall and the second circumferentially disposed wall.

Abstract: A variable valve operating device for an internal combustion engine includes a cam carrier supported on a camshaft and shifting switching pins that are advanced into and retracted out of shift lead grooves defined in the cam carrier. The shift lead grooves include shift groove side walls having shift groove side wall surfaces from shift starting inflection regions of the cam carrier to shift ending inflection regions thereof. The shift groove side walls include particular shift groove side walls extending from axial positions of the shift starting inflection regions toward shift intermediate regions and also extending from circumferential positions of the shift intermediate regions disposed between the shift starting inflection regions and the shift ending inflection regions toward the shift starting inflection regions.

Abstract: The invention relates to a radially compressible and expandable rotor (13, 13a, 13b) for a pump having at least one impeller blade (20, 22, 36, 36a, 36b, 36c, 36d, 36e, 36f, 36g, 37, 37a, 37b, 37c, 37d, 37e, 37f, 74, 88, 89, 90), wherein the impeller blade has an impeller blade body whose material is elastically deformable as well as at least one stiffening strut (25, 26, 27, 30, 31, 32, 52, 53, 57, 58, 62, 63, 67, 95) which is at least partially embedded in the material of the impeller blade body. The struts are designed suitably in size, shape and arrangement and are integrated in suitable hollow spaces of the impeller blade body for stabilizing the impeller blade. Elements with tensile strength can additionally be provided.

Abstract: The disclosure relates to a variable valve drive, in particular with a sliding cam system, for an internal combustion engine. The variable valve drive has a cam carrier which has a first and second cam and a first, second, and third engagement track. A first actuator is designed to engage into the first engagement track in order to displace the cam carrier in a first axial direction. A second actuator is designed to engage into the second engagement track in order to displace the cam carrier in a second axial direction which is opposite to the first axial direction, and to engage into the third engagement track in order to displace the cam carrier in the first axial direction. The variable valve drive can have the advantage that, even in the event of a failure of the first actuator, a displacement of the cam carrier that is normally effected by means of the first actuator is possible by means of the second actuator.

Abstract: In a valve train of an internal combustion engine, an input sprocket mounting portion is provided on one end of an exhaust camshaft, and a valve operating cam portion is formed on the other end of the camshaft. A decompression shaft of a decompression device is inserted in a decompression shaft hole, which is formed from the input sprocket mounting portion toward the valve operating cam portion. The decompression shaft hole is formed at a position offset from an axis of the camshaft. A camshaft inner oil passage is formed in the camshaft to extend from one end toward the other end of the camshaft in parallel arrangement to the decompression shaft hole to supply lubricant from the bearing journal portion to the bearing journal portion. The above arrangement makes it possible to supply a sufficient amount of lubricant oil to slide portions of the valve train of a saddle riding vehicle.

Abstract: A camshaft adjuster, comprising a drive element and an output element, wherein the drive element can be rotated in relation to the output element within an angular range between an early and a late position. The camshaft adjuster also includes a spring configured to brace the drive element with the output element, wherein the spring is configured to rotate the drive element in relation to the output element into a desired position within the angular range and is further configured to angularly adjust from both an early position and a late position into a direction of the desired position.

Abstract: A control apparatus is applied to an internal combustion engine equipped with a plurality of cylinders, a variable valve actuation system capable of switching the operation mode of intake and exhaust valve between an inactive mode and an active mode on a cylinder-by-cylinder basis, and a fuel injection valve capable of supplying fuel to each cylinder. When the engine speed is equal to or lower than a first engine speed, the control apparatus performs cylinder deactivation in the internal combustion engine by skip firing control. When the engine speed is higher than the first engine speed, the control apparatus performs cylinder deactivation in the internal combustion engine by fixed deactivated cylinder control.

Abstract: Systems for valve actuation in internal combustion engines with a dedicated rocker for actuating the at least one of two or more engine valves in a braking operation may include a biasing component, such as a compression spring, tension spring, spring catch, hydraulic actuator, pneumatic actuator for biasing the dedicated rocker in a biased direction away from the motion source, and a limiting component, such as a physical stop including a set screw or a stop integrated in the biasing component, for limiting the motion of the dedicated rocker in the biased direction. The biasing component and limiting component maintain the dedicated rocker in a controlled state and a positive, neutral position during operation.

Abstract: A variable valve timing control device includes a phase detecting portion; a phase control portion driving an electromagnetic solenoid while obtaining a detection signal detected by the phase detecting portion to set a spool to one of a phase control region and a lock region; and a boundary memory portion memorizing a boundary electric current value for referring a boundary between the phase control region and the lock region when the phase control portion operates a phase control; and a characteristic calculation portion obtaining the boundary electric current value by calculation, the boundary electric current value supporting the boundary between the phase control region and the lock region based on solenoid characteristic information of the electromagnetic solenoid and valve characteristic information of an electromagnetic control valve, the characteristic calculation portion memorizing the boundary electric current value to the boundary memory portion.

Abstract: A valve opening/closing timing control device includes: a driving side rotator synchronously rotating with a crankshaft of an internal combustion engine; a driven side rotator coaxially disposed with a rotation axis of the driving side rotator and integrally rotating with a valve opening/closing camshaft; advance and retard chambers formed between the driving side and driven side rotators; a lock mechanism including a lock member capable of engaging with a recessed portion on one of the driving side and driven side rotators and provided in the other of the driving side and driven side rotators; and a connecting bolt coaxially disposed with the rotation axis and connecting the driven side rotator to the camshaft. The connecting bolt includes an internal space, and an advance port, a retard port and a lock port are formed as through-holes, a valve unit accommodates a spool, and the spool includes an internal flow path.