Abstract: A valve timing controller with the structure of a stopper mechanism and a lock mechanism thereof is so provided as to reduce the cost and the size of the controller.

Abstract: It is proposed to lessen the weight and improve the mechanical strength of a retainer of a valve open-close mechanism driven by an electromagnetic actuator used in an automotive internal combustion engine. The electromagnetic actuator is mounted in a housing mounted on an internal combustion engine body. A first stem has its tip abutting the valve, which is provided with a retainer and carries a first coil spring. A second stem is provided on the other side of an armature. The second stem has a retainer. Between this retainer and the housing, a second coil spring is mounted. At least one of these parts is made of a metal smaller in specific weight than iron or its alloy. Each retainer has a boss and an arcuate corner portion having a radius of curvature R of 1.0 mm or over between a spring abutting surface and the boss to relieve stress concentration.

Abstract: A variable valve actuation (VVA) system (10/210) includes a camshaft (20), having a lobe (22) thereon. A valve (30/230) terminates in a stem end (34/234), and is moveable between open and closed positions along its own longitudinal axis, where the valve is biased toward the closed position. A bucket tappet (40/240) includes a lifter plate (41/241) having a middle portion (44/244) for engaging the lobe of the camshaft on a camshaft side (46/246) of the lifter plate, and for engaging the stem end of the valve on a valve side (48/248) of the lifter plate. The lifter plate includes end portions (50/250/252) on either side of the middle portion, and is translatable by rotation of the lobe of the camshaft to cause movement of the valve along its longitudinal axis toward the open position.

Abstract: This invention relates to a valve timing control device for a vehicle engine (2) which performs combustion stop in a predetermined vehicle running condition. The predetermined vehicle running condition comprises, for example, engine startup, and combustion stop is performed by stopping fuel supply to the engine (2) or stopping ignition of the supplied fuel. The device comprises an actuator (51A, 52, 55, 61) which varies the timing of an intake valve of the engine (2) according to an input signal, and a microprocessor (16, 31) which outputs the signal to the actuator (51A, 52, 55, 61). The microprocessor (16, 31) is programmed to determine whether or not combustion has stopped (S80), and when combustion has stopped, control the signal so that the open/close timing of the intake valve is retarded compared to the case when combustion has not stopped (S94).

Abstract: There is provided a valve timing control system for an internal combustion engine, which is capable of enhancing the accuracy of valve timing control. The valve timing control system 1 for the internal combustion engine 3 changes the cam phase of an intake cam 6a relative to a crankshaft 9, to thereby control the valve timing of an intake valve 4. The valve timing control system 1 fixes a desired cam phase CAINCMD at a value CAINCMDFC during an fuel cut-off, and controls a cam phase change mechanism 8 such that from a time t2 during the fuel cut-off, the cam phase is held at a value assumed at the time t2. Further, the valve timing control system 1 calculates a learned value DCALEARN of the amount of deviation of an actual cam phase CAIN based on a plurality of values of the actual cam phase CAIN detected at and after the time t2, and the constant value CAINCMDFC of the desired cam phase CAINCMD (step S5).

Abstract: An electronic arrangement for controlling gas exchange valves of an internal combustion engine with variable valve control is presented. The valve control makes possible to completely hold closed at least the inlet valves and the electronic arrangement is equipped with means for detecting the air quantity, which is inducted by the engine, and with means for detecting the valve stroke. The electronic control arrangement changes the opening function in overrun operation starting from the fully closed inlet valves so that an opening of the inlet valves takes place and the arrangement detects the index of the valve opening at which a reaction of the air quantity detection takes place and uses this index as a reference point for determining the actual opening cross section.

Abstract: A controller for an internal combustion engine has a hydraulic valve characteristic changing mechanism for changing valve operating characteristics of suction and exhaust valves; a valve system provided with a hydraulic valve phase variable mechanism that changes the phase; a map that stores a fuel injection quantity and an ignition timing in response to the valve operating characteristics; and delay time setting means for setting a delay time required to complete changeover of the valve operating characteristics, based on operating oil properties detected from behavior of a valve phase variable mechanism, to change the map after the delay time has elapsed. Thus, a valve operating characteristic changing timing coincides with a map changing timing to thereby achieve an improved performance of the internal combustion engine.

Abstract: For an arrangement with an electromagnetic actuator for actuation of a gas exchange valve of a combustion engine, for gas exchange valves that are basically aligned with a row of cylinders in the combustion engine, actuators are arranged in a joint, strip-shaped housing, which is split into two parts by notched separation for assembling the actuators.

Abstract: The lost motion arm 44 has first and second contact surfaces 102 and 104. A latch mechanism is connected on the body with an extendable plunger 120 having a first contact surface 124 and a second contact surface 126. The plunger 120 has a first position for first contact surface 124 engagement with the lost motion arm first contact surface 102 to prevent angular movement of the lost motion arm 44 with respect to the body 10 in a first angular direction. When angular movement in the first angular direction is prevented, the motion of the lost motion arm 44 imparted by the cam lobe 66 is transmitted to the body 10 to provide for a first state of operation of the valve stem 18. When the plunger 120 is in a second position, non-contacting with the lost motion arm 44, the lost motion arm 44 is allowed to pivot relative to the body 10. Accordingly, the rocker arm assembly 7 will be in a second state of total or partial deactivation of the valve stem 18.

Abstract: A modular vane cam phaser assembly for controllably and continuously varying the rotational phase between a camshaft and the crankshaft of a reciprocating internal combustion engine. The module includes a housing mountable to the front of an engine head, the housing supporting on an outer surface thereof a programmably-controllable spool valve for directing pressurized oil to an oil commutator extending into both the housing and a vane phaser wherein a rotor is bolted to the camshaft and a stator is bolted to a timing sprocket. The oil is distributed by the spool valve to opposite sides of the rotor vanes in response to signals generated by an induction cam rotation sensor and by other engine components and processed by a powertrain control module to advance or retard the opening of intake and/or exhaust valves in the engine. The housing is provided with internal passages for supplying oil from an engine port to the spool valve. Preferably, the oil is filtered by a thimble screen as it enters the housing.

Abstract: A valve timing control system for an internal combustion engine, comprising a required advance amount calculating section for calculating a required advance amount on the basis of operating condition of the engine, a valve timing control section for calculating a valve timing control variable on the basis of an obtained advance amount and the required advance amount calculated by the required advance amount calculating section, and a time period measuring section for measuring an elapsed time after the start of the engine. The required advance amount calculating section makes a calculation so that the required advance amount assumes a value smaller than that in an normal state until the time period measuring section measures a predetermined period of time. Hence, exhaust gas clarification immediately after the engine start, fuel consumption and drivability can be improved.

Abstract: A vane-type camshaft phaser wherein a coil spring under torsional compression or extension is disposed coaxially within an annular cavity formed in either the cover plate or back plate. A first end of the spring is connected to the cover plate or back plate, and a second end extends from the cavity and is connected to the phaser rotor. The spring constant is selected such that a biasing torque is exerted on the rotor in the valve-opening-advancing direction which counters the inherent valve-opening-retarding torque bias of the camshaft during operation. The bias spring permits more rapid response to a demand on the cam phaser for advancing valve timing, and is also useful in orienting the camshaft advantageously, especially an exhaust valve camshaft, in a timing-advanced position when the engine is shut off or operating at low engine speed.

Abstract: Disclosed is an overhead rocker cam valve operating device for an internal combustion engine which is particularly useful for race cars or high performance automobiles. The device includes a rocker cam and connecting link, the link being adjustable within the rocker cam arm to provide for more of less power. Hence, the connecting link can be positioned closest to the cam lobe to provide for more power, performance and speed, or can be positioned farther from the cam lobe to provide for less power and fuel economy. The device can be made remotely adjustable by providing means engageable with the connecting link, such as a solenoid, whereby the link can be remotely positioned within the rocker cam arm.

Abstract: The present invention pertains to a valve actuating lever having a non-cut formed oblong base body which is configured essentially symmetrical to a longitudinal symmetry plane extending essentially longitudinally therefrom, a valve contact area arranged on a first end of said base body, two tabs arranged on both sides of said longitudinal symmetry plane in said valve contact area, each respectively having a lateral surface aligned facing said longitudinal symmetry plane, whereby said tabs are formed on said base body and bent over toward said valve contact area. Said tabs are arranged spaced at a clearance distance at an end edge of said oblong base body, said clearance distance being less than the clearance of said lateral surfaces in the valve contact area.

Abstract: A controller for electrically actuated engine valves operates in a switching mode to monitor back EMF during periods when the coil drive current is off. Back EMF is used to determine a position of the armature so as to control the armature current to provide for soft seating of the valve reducing valve wear.

Abstract: An internal combustion engine includes a camshaft (40) and hub (30) secured to the camshaft (40) for rotation therewith, where a housing (20) circumscribes the hub (30) and is rotatable with the hub (30) and the camshaft (40), and is further oscillatable with respect to the hub (30) and camshaft (40). Driving vanes (22) are radially inwardly disposed in the housing (20) and cooperate with the hub (30), while driven vanes (32) are radially outwardly disposed in the hub (30) to cooperate with the housing (20) and also circumferentially alternate with the driving vanes (22) to define circumferentially alternating advance and retard chambers (28A/28R). A configuration for controlling the oscillation of the housing (20)relative to the hub (30) includes an electronic engine control unit (70), and an advancing control valve (50) that is responsive to the electronic engine control unit (70)and that regulates engine oil pressure to and from the advance chambers(28A).

Abstract: A cam system to generate valve actuation in an engine that includes a circular camlobe rotated about a first axis is described. The first axis is a preselected distance from the centerpoint of the circular camlobe. The cam system also includes a cam-follower that surrounds the camlobe and that has an inner oval surface with a major and minor axis. The inner oval surface is in moving contact with the circular camlobe during rotation of the camlobe.

Abstract: In order to supply a sufficient quantity of lubricating oil to the entire valve operating mechanism, we designed a lubrication device for an overhead valve engine. A first breather passage goes from the valve operating mechanism chamber to the crankcase, passing through the cylinder head and cylinder. The first breather passage opens in the vicinity of the spring retainer for the intake valve on the surface of the cylinder head which faces the valve operating mechanism chamber for the valve operating mechanism. The opening of the first passage and the vicinity of the exhaust valve are connected by a second breather passage. This second passage comprises a groove formed by cutting in the valve operating mechanism chamber surface of the cylinder head, and a tunnel formed between an oil guide wall which goes up from the valve operating mechanism chamber surface of the cylinder head and the peripheral wall of the head. One end of this groove connects to the opening of the first breather passage.

Abstract: A multi-cylinder engine in which a transmission mechanism is provided between a cam shaft linked with intake valves and exhaust valves and a crank shaft rotatably supported by a crank case and a plurality of bearing caps, wherein the transmission mechanism is configured as a chain-type transmission mechanism for making the engine compact. The restriction on the rotatably supporting position of a chain tensioner is moderated and the length of the chain tensioner is set at a relatively large value. The transmission mechanism is configured such that an endless chain, is wound around a drive sprocket, fixed on a crank shaft and a driven sprocket, fixed on a cam shaft. One end portion in the longitudinal direction of a chain tensioner, extending in the running direction of the chain is rotatably supported on one of the plurality of bearing caps in such a manner as to be elastically, slidably in contact with the chain.

Abstract: An engine having a cylinder, piston having a skirt having an actuating member, a upper rocker-arm being pivotally coupled to the intake valve, a first push-rod, said being pivotally coupled to the upper rocker arm, a lower rocker-arm being pivotally connected to the push-rod, the lower rocker-arm being positioned so as to engage the actuating member of the piston.