Abstract: A hydraulic camshaft adjusting device, which comprises a drive wheel (2) and a pivotal impeller wheel (10) connected in a rotationally fixed manner to a camshaft (9), the drive wheel (2) comprises a. cavity formed by a peripheral wall (3) and two lateral walls, in which cavity at least one hydraulic working space (8) is formed by at least two delimitation walls (7) and the pivotal impeller wheel (10) has at least one radial blade (12), and with each blade (12) divides a hydraulic working space (8) into two hydraulic pressure chambers (13, 14), which are sealed off from one another by sealing elements (17) disposed between the drive wheel (2) and the pivotal impeller wheel (10), the pivotal impeller wheel (10) can be mechanically coupled to the drive wheel (2) in a preferred basic position, a locking element (18) disposed on the drive wheel (2) being movable by a spring clement (19) into a complementary seating (20) in the drive wheel (2).

Abstract: Described herein is an internal-combustion engine provided with an electro-hydraulic device of an improved type for controlling variable actuation of the valves of the engine.

Abstract: A hydraulic lash adjuster has a plunger assembly the outer end of which can be moved inwardly until the inner end abuts a seal and closes a high pressure chamber, thus preventing further movement. This accommodates any necessary movement of a valve towards its closing position to ensure proper closure. Consequently, net-shaped cams wherein the base circle is not necessarily accurately concentric may be used. A leaf spring ensures opening of the chamber when the base circle of the cam is next reached.

Abstract: A variable valve timing controller has a housing having a hole in its surface facing a vane rotor. A fitting ring is press-fitted into the hole. A stopper piston prevents relative rotation between the vane rotor and the housing by engaging with the fitting ring. The hole is formed with a part non-contacting with the fitting ring near a through hole, in which a camshaft is inserted, of the housing. Since the fitting ring is apart from the inner surface of the non-contacting part when the fitting ring is press-fitted, little or no stress arises around the non-contacting part near the through hole. Therefore, deformation of the through hole is prevented and sliding friction between the inner periphery of the through hole and the camshaft is minimized.

Abstract: The invention proposes a switching element (1) for a valve train of an internal combustion engine, said switching element comprising an outer element (2) and an inner element (4) that is arranged for axial displacement in a bore (3) of the outer element (2), each of the outer element (2) and the inner element (4) comprising at least one reception (12, 9) aligned to each other in an axially distant relative position which is achieved through a lost motion spring (8), at least one piston (10) being arranged in at least one of the receptions (12, 9) for sliding toward the other of the receptions (12, 9) to couple the inner element (4) to the outer element (2) in said relative position, and a high-position stop for defining said relative position being arranged between the inner element (4) and the outer element (2).

Abstract: A sealed cover, such as an engine valve or rocker cover, is mounted on an engine with balanced grommets which support the cover through equal compression loads on inner and outer sides of the cover. A sealing surface of the cover is positioned with a fixed gap from a facing sealing surface of a cylinder head or other engine component. The gap is sealed by a liquid RTV seal material that is vulcanized in place at room temperature after installation of the cover. The arrangement separates the function of noise isolation from the sealing function performed by the RTV material so that the specifications of the sealing material and the noise isolating grommet material can be varied as desired to perform their separate functions without a change in one affecting the other.

Abstract: A valve timing control device is mounted on an end of a camshaft having a plurality of cams opening and closing an intake or exhaust valve of an internal combustion engine to modify timing for the opening and closing of the intake or exhaust valve by way of a tappet. The device includes a bias means biasing the camshaft in an advanced direction with a biasing force approximately equal to or smaller than a peak value of frictional torque produced between a cam of the camshaft and the tappet.

Abstract: The present invention relates to a variable valve lift system that varies a valve lift in two stages by selectively rigidly engaging a tappet shim.

Abstract: Deactivation apparatus for selected cylinders of an engine include switching hydraulic lash adjusters or valve lifters forming part of a valve train for actuating engine valves of the selected cylinders and operable to actuate or release their respective valves in response to an oil pressure signal. A gallery carrying the lash adjusters includes oil passages fed by an engine pressure oil supply through a control valve to supply oil to switching portions of the lash adjusters. The control valve is operative to close or open communication of the oil supply with the lash adjusters and to relieve oil pressure in the passages when communication with the pressure oil supply is closed. Various bypass alternatives between the pressure oil supply and the oil passages carry oil to portions of the oil passages to purge air from the passages when the three-way valve exhaust port is open.

Abstract: An internal combustion engine tapered push rod assembly construction is disclosed, as well as a novel method of partially making the assembly elongated body section component from tubular push rod feedstock by removing excess exterior feedstock to form the body section exterior taper rather than by known conventional radial compression of feedstock exterior material that otherwise results in an unwanted feedstock reduced internal diameter, and an unwanted increased body section wall thickness configuration.

Abstract: In an engine employing a variable lift and working angle control mechanism enabling both a valve lift and a working angle of an intake valve to be continuously simultaneously varied depending on engine operating conditions, the control mechanism includes at least a rocker arm and a control shaft formed integral with an eccentric cam. The valve lift characteristic of the control mechanism varies by changing an angular position of the control shaft. A control-shaft position sensor has a directivity for the sensor output error occurring owing to a change in relative position between the control shaft center and the position sensor. The error becomes a minimum value in a specified direction of relative position change. The specified direction of relative position change is set to be substantially identical to a direction of a line of action of load acting on the center of the control shaft during idling.

Abstract: The present invention provides an actuator assembly for operating a cylinder valve of an internal combustion engine. The actuator assembly achieves fast response times by utilizing a solenoid actuator that contains an armature element formed of a powder metal. A valve system that utilizes two of the actuator assemblies in conjunction with a cylinder valve is also provided.

Abstract: In a VVA apparatus, when an actual lift amount detected by a lift-amount detecting sensor exceeds a basic lift-amount target value by a predetermined value or more, ECU corrects a lift phase through a lift-phase varying mechanism to separate from a piston TDC with respect to a basic lift-phase target value.

Abstract: Electrohydraulic device for operating an intake or exhaust valve of a combustion engine; the electrohydraulic device comprises a linear hydraulic actuator designed to move the valve axially from a closed position to a maximum opening position, and an electronic control hydraulic distributor designed to regulate the flow of pressurized liquid from and towards the linear hydraulic actuator in order to control movement of the above-mentioned valve between the closed and maximum opening positions; the electronic control hydraulic distributor comprises a slide valve which, by selection, can be set to three positions: a first operating position in which it establishes direct communication between the linear hydraulic actuator and an outlet of the pressurized liquid, a second operating position in which it isolates the linear hydraulic actuator in such a way as to prevent the flow of pressurized liquid from or towards the actuator, and a third operating position which establishes direct communication between the lin

Abstract: A piston internal combustion engine with at least one gas exhaust valve (2) for each cylinder (1), which is actuated by an actuator (7), in particular an electromagnetic actuator, controlled by a fully variable engine control unit (15). Based on the predetermined operating cycle, the valve can close off the cylinder interior space against a gas exhaust channel (13) that follows the valve seat (3) of the exhaust valve. This channel is connected to an exhaust gas system and is provided with a means for example a constriction (14) for reducing the pressure gradient during the start of the opening of the gas exhaust valve (2). A specific pressure fluctuation is used for a further reduction in the pressure gradient behind the exhaust valves during the opening through a corresponding layout of the pipe geometry and the container volumes in the exhaust gas system or corresponding installed components.

Abstract: A valve timing control system for an internal combustion engine for preventing hitching of a lock pin of an actuator at the time of changing a cam angle is provided. The valve timing control system is provided with actuators 15 and 16 connected to cam shafts 15C and 16C, hydraulic pressure supply units 19 and 20 for driving the actuators, and a controller 21A for controlling a hydraulic pressure for the actuators in dependence on engine operation states while changing a relative phase of the cam shafts relative to crank shafts. The actuator includes a locking mechanism for setting the relative phase to a lock-up position, and an unlocking mechanism for releasing the locking mechanism in response to a predetermined hydraulic pressure. The controller executes a releasing operation of the locking mechanism if the lock-up position in the locking mechanism changes from inside a predetermined range to outside the predetermined range.

Abstract: The cam face of an intake cam has a main lift portion, which causes an intake valve to execute a basic lift operation, and a sub lift portion, which assists the action of the main lift portion. The main lift portion and the sub lift portion continuously change in an axial direction of the intake cam. An axial movement mechanism moves the intake cam in the axial direction to adjust the axial position of the cam face that drives the intake valve. The axial movement of the intake cam results in the valve being given a variety of valve lift characteristics in the form of a combination of a cam lift pattern realized by the main lift portion and a cam lift pattern realized by the sub lift portion. Therefore, various engine performances required according to the running conditions of the engine can be fully satisfied by the valve characteristics.

Abstract: A system for controlling the timing of a cylinder valve in a reciprocating internal combustion engine includes a crankshaft position sensor for determining position of the crankshaft, and a camshaft structural force sensor for determining the presence of a structural force upon the camshaft related to a unique rotational position of the camshaft. A controller receives position signals from the crankshaft and camshaft structural force sensors. The controller compares the valve position signal from the structural force sensor with a predicted valve position based upon the crankshaft position and determines if the predictive value is in error. If an error is greater than a specified threshold, the predictive model will be corrected.

Abstract: A variable valve timing control device includes a relative rotation control mechanism restricting relative rotation between the housing member and the rotor member at an intermediate phase position between a most advanced angle phase position and a most retarded angle phase position, and a hydraulic pressure circuit which controlling supply and discharge of operation fluid with respect to advance and retarded angle hydraulic chambers while also controlling supply and discharge of operation fluid for the relative rotation control mechanism. The hydraulic pressure circuit includes a variable type spool valve adapted to discharge the operation fluid from the advance and retarded angle chambers and from the relative rotation control mechanism. The variable type spool valve has different discharge opening widths at a both drain function region in which the operation fluid can be drained from the advanced and retarded angle hydraulic chambers.