Abstract: A control method for stability of an intermediate phase Continuously Variable Valve Timing (CVVT) system may include comparing an oil temperature of the intermediate phase CVVT system with a predetermined value, and interrupting an operation of controlling the CVVT system when the oil temperature is lower than the predetermined value, comparing an engine RPM with a predetermined value, and interrupting the operation of controlling the CVVT system when the engine RPM is lower than the predetermined value, and comparing an operating current of the CVVT system with a predetermined management value A when the operation of controlling the CVVT system is not interrupted.

Abstract: A hydraulic, vane-type camshaft adjuster (1) having a rotor (2) and a stator (3) mounted such as to be rotatable relative to each other and to form vanes, wherein, for the radial positioning of the rotor (2) relative to the stator (3), a return spring (5) is or can be secured at one end to the rotor (2) and at the other end to the stator (3), and a spring contact component (15), especially in the shape of a ring, for centering the return spring (5) and/or limiting the radial position thereof, is fixed to the rotor (2) in at least two points.

Abstract: The present invention relates to a variable camshaft adjuster (VVT) for an internal combustion engine with a VVT component, preferably a locking disc, composed of material produced from powder metal with a locking bore, which extends from a first surface of the VVT component, preferably the locking disc, into this, wherein a locking bolt of a variable valve control engages into the locking bore and the locking bore has a connected oil duct which also extends from the first surface into the VVT component and discharges radially into the locking bore, wherein a base of the locking bore has an elevation, preferably in the form of an elevated shoulder which serves as a bearing surface of the locking bolt and the oil duct has a depth which is smaller than that of the locking bore. A VVT component, in particular a locking disc as well as a method for producing the locking disc or the camshaft adjuster are furthermore claimed.

Abstract: A valve timing control device for an internal combustion engine; a driving rotation member to which a rotational force is transmitted from a crank shaft; a driven rotation member arranged to rotate as a unit with a cam shaft; and a fixing member disposed between an axial one end portion of the cam shaft and the driven rotation member, the driven rotation member including a first recessed portion formed at a position to confront the axial one end portion of the cam shaft, and the fixing member including a second recessed portion which is formed at a position to confront the axial one end portion of the cam shaft, and in which the one end portion of the cam shaft is mounted from an axial direction, and a raised portion mounted in the first recessed portion.

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: The present disclosure relates to a variable valve drive for a lifting valve, in particular for a charge-exchange valve of an internal combustion engine, which is periodically movable between a closed position and an open position indirectly by way of a cam via a rocker lever. The variable valve drive includes a switchable rocker lever arrangement for the actuation of the lifting valve, having a transmission rocker lever and a valve rocker lever which are mounted pivotably on different rocker lever axles which are each parallel to the camshaft axis.

Abstract: A camshaft assembly for an internal combustion engine is provided. The camshaft assembly includes a first gear; a second gear; a hydraulically driven phasing assembly configured for varying the relative phasing of the second gear with respect to the first gear; and an idler shaft supporting the first gear. A method of constructing a camshaft assembly for an internal combustion engine is also provided. The method includes fixing a first gear and a second gear together via a hydraulically driven phasing assembly configured for varying the relative phasing of the second gear with respect to the first gear; and providing the first gear on an idler shaft.

Abstract: A phaser with a rotor assembly having a pattern on an inner diameter that acts as a sealing land or divider between the advance supply port and the retard supply port. This pattern allows the advance supply ports and the retard supply ports to be on the same plane, allowing the overall axial length of the rotor to be shorter. The pattern is preferably formed onto the inner diameter of the rotor through net forming.

Abstract: A valve opening/closing timing control apparatus includes: a driving side rotator configured to rotate synchronously with a crankshaft of an internal combustion engine; a driven side rotator disposed coaxially with a rotation axis of the driving side rotator and configured to rotate integrally with a valve opening/closing camshaft; a connecting bolt disposed coaxially with the rotation axis to connect the driven side rotator to the camshaft, and having an advanced angle port and a retarded angle port formed to extend from an outer peripheral surface to an inner space thereof, the advanced angle port and the retarded angle port communicating with an advanced angle chamber and a retarded angle chamber between the driving side rotator and the driven side rotator, respectively; and a valve unit disposed in the inner space of the connecting bolt.

Abstract: A system for controlling a variable valve apparatus may include a plurality of oil control valves (OCVs) configured to respectively supply oil from an oil pump to a plurality of variable valve apparatuses or block the supply of the oil, and a single relief valve coupled to the plurality of oil control valves, wherein pressure in a plurality of control galleries for providing an oil supply path from the plurality of oil control valves to the plurality of variable valve apparatuses is maintained constant by only the single relief valve.

Abstract: A rotor for a hydraulic camshaft adjuster. The rotor includes a first rotor element and a second rotor element. At least one of the rotor elements has oil channels separated from each other by radially arranged elevations. Each elevation of the first rotor element has a first joining profile and the second rotor element forms a complementary-shaped second joining profile corresponding to the position of each first joining profile, wherein the first and the second joining profile engage with each other in the assembled rotor.

Abstract: A variable valve mechanism includes a rocker arm including a first input arm, a second input arm, and an output arm, and a switch device that switches an operating state to a first state by coupling only the first input arm to the output arm, and switches the operating state to a second state by coupling only the second input arm to the output arm. The switch device includes two pins that are displaceably placed in the rocker arm and contact each other at their end faces, and a displacement device that switches the operating state to the first state by displacing a contact portion between the two pins to between the output arm and the second input arm, and switches the operating state to the second state by displacing the contact portion between the two pins to between the output arm and the first input arm.

Abstract: A control valve for a camshaft adjuster having a valve housing (3) and having a control piston (4) which is guided axially movably in a receptacle of the valve housing (3), and having a check valve (2) which is arranged within the piston cavity (22) and consists of a spring band (23) with overlapping ends which is wound to form a cylindrical valve spring, wherein the spring band (23), at the inner end (24) thereof, merges into an axially extending spacer element (28), the axial ends (29, 30) of which may be brought into contact with the inner side of the end surfaces of the control piston (4) is provided. The spacer element (28) has a uniform surface which is interrupted in an axial section of the spacer element (28) by way of an elevation (32).

Abstract: A valve timing regulation device includes a housing, a vane rotor, a sleeve and a spool. The housing is fit to an end of a camshaft. The sleeve has a supply port, a drain port, a first control port, a second control port and a first drain oil passage. The spool has a connection oil passage provided to a shaft center part to connect the supply port to either the first control port or the second control port according to an own axial position. The drain port is connected to a drain space through a second drain oil passage provided to span the vane rotor and the camshaft. A hydraulic oil of a retard chamber is discharged to the drain space through the second drain oil passage. It is unnecessary to provide a discharge hole to the camshaft, and a shaft length of the camshaft can be shorter.

Abstract: Cam actuated valves for compressors including mechanisms for changing an instant when the cam actuated valve is opened and/or a time interval during which the cam actuated valve is in an open state within the time range of a compression cycle. A reciprocating compressor has: a body including a compression chamber; a cam having an oblong portion, being located inside the body and being configured to be rotated around a rotation axis, to perform a rotation during each compression cycle; an actuating element located inside the body and configured to receive a linear displacement or an angular displacement due to the oblong portion of the cam; and a valve located on a flow path of the fluid toward or from the compression chamber and configured to be switched to an open state by the actuating element. The reciprocating compressor also includes a controller configured to adjust timing of the valve.

Abstract: A camshaft adjusting device including —a vane cell adjuster and —a central locking device (26) for locking the rotor (17) with respect to the stator (16), wherein —at least one first valve functional pin (46) is provided in the rotor hub (30), and the working chambers (20, 21, 22, 23) with different directions of action can be fluidically connected to one another via said valve functional pin, —in a first switch position, the first valve functional pin (46) fluidically connects at least two first working chambers (20, 21) with different directions of action to each other via a non-return valve (9, 10) during a movement from the direction “early” or “late” into the central locking position, —in a second switch position, the first valve function pin (46) fluidically separates the at least two first working chambers (20, 21) with different directions of action, —a bridging line (50) is provided for a fluid-free connection of the two first working chambers (20, 21), and —the bridging line (50) can be switched by

Abstract: A vane-type, hydraulic cam shaft adjuster (1, 20) having a stator (2) and a rotor that is rotatably mounted in relation to the stator (2), wherein at least one locking bolt (10) is provided in order to limit the rotor in relation to the stator (2), in at least one direction of rotation, when the locking bolt is brought into contact with a slot guide (12) of an insert part (4, 21), wherein the insert part (4, 21) is secured in a component (2) that is secured to the stator, wherein the insert part has securing regions, between which securing regions and the component (2) that is secured to the stator there is frictional connection, and wherein the insert part (4, 21) is formed, in terms of material and geometrics, in such a way that a deformation (19) causes a change in length (18) of the insert part (4, 21), involving the friction connection.

Abstract: Disclosed is an apparatus of adjusting valve timing for internal combustion engine configured to adjust at least one valve timing of an intake valve and an exhaustive valve by torque of a cam shaft and pressure of working fluid, and a method thereof. The method of the present disclosure is such that a rotor is embedded with a hydraulic control valve configured to operate a locking pin member, and the hydraulic control valve is so configured as to have various control positions in order to supply or discharge working fluid in response to engine emergency stop or start and normal engine operational state whereby locking and releasing operations are realized with accurate responsiveness and reliability due to smaller working fluid through a passage and an engine performance can be improved by adjusting the valve timing.

Abstract: A cam phaser has a stator, a rotor positioned in the stator and including a locking pin, a locking cover including a receiving feature for receiving the locking pin, a cover plate, and a check valve plate positioned between the stator and the locking cover and including a plurality of valve elements. The cam phaser also has a plurality of first openings in each of the stator, locking cover, and check valve plate, a plurality of second openings in the locking cover, and a third opening formed in the check valve plate. The cam phaser further includes a retention feature for aligning components of the cam phaser during assembly, the retention feature including one or more tabs on a first component and one or more indentations on a second component receiving the one or more tabs.

Abstract: A cam phaser including a rotation phaser and a hydraulic valve hydraulically loading the rotation phaser, wherein the hydraulic valve is connectable torque proof with a cam shaft so that the cam shaft is rotatable, wherein the rotation phaser includes a stator and a rotor configured coaxial with the stator, wherein the rotor is rotatable relative to the stator, wherein the hydraulic valve is configured so that it protrudes at least partially into the rotation phaser, wherein an adapter is provided for a relative axial positioning of the rotor and the stator. According to the invention the adapter is configured for loose mounting in the rotation phaser so that a fixated connection of the adapter in the rotation phaser is provided when the cam shaft is mounted at the hydraulic valve.

Abstract: Lock pin (71) is disposed movably in axial direction in accommodation hole (70) formed at vane rotor (12). Top end portion of lock pin (71) is fitted into lock hole (23) provided at housing (11), then relative rotation position of vane rotor (12) is restrained at predetermined lock position. Vane rotor (12) is provided with small diameter portion (84) and large diameter portion (85) which are formed alternately in circumferential direction. Large diameter portion (85) extends in circumferential direction so as to cover lock hole (23). First vane (36A) protrudes from outer periphery of large diameter portion (85) to radially outer side. At least a part of lock pin (71) and at least a part of accommodation hole (70) overlap with large diameter portion (85), and are located at position that overlaps with area (86) formed by elongating first vane (36A) to radially inner side.

Abstract: A control apparatus for an internal combustion engine, which is capable of, when controlling a variable intake cam phase mechanism and a variable exhaust cam phase mechanism, ensuring a stable combustion of a mixture and improving the drivability, even when one of the two is in a failure state. The control apparatus includes an ECU. The ECU calculates an intake cam phase and an exhaust cam phase, determines, based on the calculated intake cam phase and exhaust cam phase, whether or not there has occurred a failure state of one of the mechanisms, in which the valve overlap period becomes longer than during a normal time, and controls, when it is determined that there has occurred the failure state of the one mechanism, the other mechanism such that the valve overlap period becomes shorter.

Abstract: An engine is disclosed of the V-configuration having an integrated engine and transmission. The engine has an engine ventilation system communicating between the crankcase and an upper end of the valve cover, whereby blow-by gases can be returned to the air intake system to recycle the unspent fuel. The engine also includes an easily accessible/removable cam, such that the camshaft may be removed without removing the rocker arms. The engine also includes a lubrication system for lubricating components of the engine and transmission.

Abstract: Systems and methods for operating an engine that includes a canister for storing fuel vapors are disclosed. In one example, one or more engine cylinders are deactivated in response to a level of fuel vapors stored in a fuel vapor storage canister when deceleration fuel shut off conditions are met. By deactivating one or more engine cylinders with closed intake and exhaust valves, it may be possible to reduce fuel vapors drawn into engine cylinders to reduce the possibility of cylinder misfire.

Abstract: 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.

Abstract: A composite structure includes: a cover plate having a countersunk hole and a plate side fitting hole; a bearing plate having a screw hole and a screw side fitting hole located opposite from the plate side fitting hole through the screw hole; and a plate screw component including a screw part engaged with the screw hole, and a plate side fitting part and a screw side fitting part respectively fitted with the plate side fitting hole and the screw side fitting hole to be in alignment with each other. A difference ??a in diameter between the plate side fitting hole and the plate side fitting part, a difference ??b in diameter between the screw side fitting hole and the screw side fitting part, and an effective difference ??c in diameter between the screw hole and the screw part satisfy a dimensional relation of ??a<??c and ??b<??c.

Abstract: Methods and systems are provided for adjusting a fuel direct injection split ratio and injection timing in a variable compression ratio engine. In one example, as the compression ratio increases, the split ratio of fuel injected during an intake stroke relative to a compression stroke is increased, with a start of the intake stroke injection retarded and a start of the compression stroke injection advanced. Additionally, the fuel direct injection split ratio and injection timing may be further adjusted responsive to an indication of pre-ignition or knock.

Abstract: A valve opening and closing timing control apparatus includes a valve opening and closing timing control apparatus provided at a camshaft for an intake valve of an internal combustion engine and a valve opening and closing timing control apparatus provided at a camshaft for an exhaust valve and includes a control unit changing a phase of one of the valve opening and closing timing control apparatus for the intake valve and the valve opening and closing timing control apparatus for the exhaust valve serving as an electric type which malfunctions to a most advanced angle phase and changing a phase of the other of the valve opening and closing timing control apparatus which is inhibited from malfunctioning to an advanced angle side in a case where one of the valve opening and closing timing control apparatus serving as the electric type malfunctions.

Abstract: A hydraulic camshaft adjuster of the vane cell type, including a rotor and a stator and including a cover having fastening holes extending all the way through for accommodating fasteners. Via the fasteners the cover is fastened at an end face to the stator. The cover has a locking hole, into which a locking pin accommodated in the rotor can be displaced in an axial direction in order to lock the rotor in relation to the stator.

Abstract: A camshaft drive system for an internal combustion engine, includes a camshaft including a plurality of cam lobes thereon. A planetary gear system including a first component drivingly connected to the camshaft. A motor is drivingly connected to a second component of the planetary gear system and a sprocket is driven by the internal combustion engine and drivingly connected to a third component of the planetary gear system. A controller controls operation of the motor for selectively driving the second component at a same speed as the third component for imparting rotation to the camshaft and for selectively preventing rotation of the second component of the planetary gear system for preventing rotation of the camshaft.

Abstract: A method of controlling an engine which has a continuous variable valve duration (CVVD) device that controls an operation of opening or closing an intake valve, and an ETC device that controls an operation of opening or closing a throttle valve and adjusts the amount of air to be introduced into a combustion chamber, may include determining whether it is necessary to increase or decrease engine torque; changing a duration of the intake valve by using the CVVD device when it is necessary to increase or decrease the engine torque; and adjusting the amount of air introduced through the ETC device in a state in which the duration of the intake valve is changed.

Abstract: Methods and systems are described for an engine with a cam torque actuated variable cam timing phaser. Phaser positioning control is improved by reducing inaccuracies resulting from inadvertent spool valve and/or phaser movement when the spool valve is commanded between regions. In addition, improved spool valve mapping is used to render phaser commands more consistent and robust.

Abstract: A valve opening and closing timing control apparatus includes: a driving side rotor synchronously rotating with a crankshaft of an internal combustion engine; a driven side rotor disposed coaxially with a rotary axis of the driving side rotor and synchronously rotating with a camshaft; a connecting bolt disposed coaxially with the rotary axis, and connecting the driven side rotor to the camshaft; and a position determination unit performing positioning between the driven side rotor and the camshaft, or in a case where an intermediate member is provided between the driven side rotor and the camshaft, between the driven side rotor and the intermediate member, or between the camshaft and the intermediate member, wherein the position determination unit includes an engaging pin, first and second hole portions, and a deformation absorbing unit.

Abstract: Systems and methods for a cam phasing control system are provided. In particular, systems and methods are provided for a cam phasing control system that can be configured to control a first cam phase actuator and a second cam phase actuator and selectively switch the operation thereof between a regenerative mode and an oil pressure actuation mode.

Abstract: A hydraulic camshaft adjuster (1) with a stator (2) in which a rotor (3) is rotatably arranged. A vane (4) which protrudes radially outwards is provided on the rotor (3), the vane being provided with a pressure chamber delimiting side (7). A pressure chamber supply groove (10) is arranged so as to extend on a separation plane which separates the rotor (3) into two halves in order to supply a hydraulic medium to a pressure chamber formed by the rotor (3) and the stator (2), the pressure chamber supply groove (10) having an outlet (11) in the pressure chamber delimiting side (7) of the vane (4).

Abstract: A valve opening and closing timing control apparatus includes: a driving side rotor synchronously rotating with a crankshaft of an internal combustion engine; a driven side rotor disposed coaxially with the driving side rotor and synchronously rotating with a camshaft; a fluid pressure chamber formed on at least one of the driving side and driven side rotors, and partitioned into advance angle and retard angle chambers; a bolt member disposed coaxially with a rotary axis of the driven side rotor, connecting the driven side rotor and the camshaft, and provided with a cylindrical portion; a partition body provided with a press-fit portion, and partitioning the cylindrical portion into first and second flow passages; a valve body opening and closing the first flow passage; and a valve housing body accommodating the valve body.

Abstract: A method and device for controlling a supercharged internal combustion engine is disclosed. An oxygen charge of a catalytic converter of the internal combustion engine is determined. A valve overlap of the internal combustion engine is increased from a lower valve overlap value to an upper valve overlap value. Increasing the valve overlap and/or for at least one phase of the increase, a control value for increasing an air-fuel ratio in at least one cylinder of the internal combustion engine is reduced as a function of the determined oxygen charge.

Abstract: The wave generator of the strain wave gear device comprises: a rigid plug; a roller bearing fitted on the elliptical outer circumferential surface thereof; and first and second cylindrical springs, which press loose rollers that have some play in the radial direction between the outer race and the inner race of the roller bearing against the outer raceway surface. The loose rollers are pressed against the outer raceway surface with a linear contact and roll according to the outer raceway surface. Skewing of the rollers is limited, ensuring smooth rotation of the roller bearing.

Abstract: A method for controlling valve timing of a continuous variable valve duration engine may include: classifying a plurality of control regions depending on an engine speed and an engine load; applying a maximum duration to an intake valve and controlling a valve overlap between an exhaust valve and an intake valve by using an exhaust valve closing (EVC) timing in a first control region; advancing an intake valve closing (IVC) timing and applying a maximum duration to the exhaust valve in a second control region; advancing the IVC timing and the EVC timing in a third control region; controlling the EVC timing in a fourth control region; controlling a throttle valve to be fully opened and controlling the IVC timing in a fifth control region; and controlling the throttle valve to be fully opened and advancing the IVC timing in a sixth control region.

Abstract: A control unit for controlling a phase angle of a first camshaft of an internal combustion engine includes a first characteristic diagram signal generator for determining a dynamic setpoint phase angle of the first camshaft, a second characteristic diagram signal generator for determining a static setpoint phase angle of the first camshaft, and a first interpolator for determining a corrected setpoint phase angle of the first camshaft based on the dynamic setpoint phase angle of the first camshaft and on the static setpoint phase angle of the first camshaft. A motor vehicle including a control unit for controlling a phase angle of a first camshaft of an internal combustion engine and a method for controlling a phase angle of a first camshaft of an internal combustion engine are also provided.

Abstract: The present disclosure provides a hydraulic control valve for a valve timing adjusting device of an engine. The valve timing adjusting device has a hydraulic control valve; a housing; a rotor installed in the housing and having vanes forming advance, retard and locking chambers, respectively; and a locking pin member elastically installed at the locking chamber. In particular, the hydraulic control valve includes: a valve body connected to the camshaft and having ports and a spool space; an outer spool elastically installed in the spool space and having distribution ports selectively communicated with or disconnected to the ports of the valve body; and an inner spool that is integrally coupled to the outer spool and forms a supply passage connected to a working fluid pump and a drain passage connected to a drain tank together.

Abstract: A control system of a continuously variable valve duration (CVVD) is provided. A system for controlling a CVVD by adjusting an actuator for controlling the CVVD includes an electronic control unit (ECU) configured to output a command for adjusting the actuator based on a vehicle state and a cam position sensor is configured to measure a cam revolutions per minute (RPM). A controller is configured to calculate a crank RPM from the cam RPM when a failure occurs during communication with the ECU. A target phase angle is extracted based on the calculated crank RPM, and an electric current is output that corresponds to the extracted target phase angle to the actuator.

Abstract: The invention relates to a rotor for a camshaft adjuster for rotation about a rotation axis. The rotor has an inner sheath and an outer sheath and at least one control vane, pointing at least substantially radially away from the rotation axis, having a first control vane side and a second control vane side. The rotor furthermore has a first liquid channel system and a second liquid channel system, wherein the first liquid channel system opens in a first liquid channel opening and the second liquid channel system opens in a second liquid channel opening. The rotor comprises: a first sintered joining part, a second sintered joining part which is joined to the first sintered joining part and an insert part which is inserted in an intermediate chamber which is formed by at least one of a first recess of the first sintered joining part and a second recess of the second sintered joining part. The invention further relates to a parts set and to a method for producing a joined component.

Abstract: A valve opening and closing timing control apparatus includes: a driving side rotor synchronously rotating with a crankshaft of an engine; a driven side rotor disposed coaxially with the driving side rotor and synchronously rotating with a camshaft in the internal combustion engine; a fluid pressure chamber formed on at least one of the driving side and driven side rotors, and partitioned into advance angle and retard angle chambers; a bolt disposed coaxially with a rotary axis of the driven side rotor, connecting the driven side rotor and the camshaft, and including a cylindrical portion coaxial with the rotary axis; and a partition body including a press-fit portion press-fitted into the cylindrical portion, and partitioning the cylindrical portion into first and second flow passages for use for feeding and discharging working fluid to and from the fluid pressure chamber, wherein the press-fit portion is provided with a cutting portion.

Abstract: A control system for an internal combustion engine is provided with a crankshaft, an intake camshaft with an intake cam, a timing chain, an intake variable valve timing mechanism configured to be able to change at least one of an opening timing and closing timing of an intake valve by controlling a phase of the intake cam, and an electronic control unit configured to set in advance a periodic correction coefficient to vibrate by a period identical to a rotational period of the timing chain and to control the intake variable valve timing mechanism by the periodic correction coefficient to make the phase of the intake cam a target phase.

Abstract: A rotor (1) for a vane cell adjuster of a camshaft adjusting device including a central through opening (10) and at least one radially outwardly projecting vane (2). The rotor (1) is made of at least two parts, an inner part (8) made of a first material and an outer part (3) made of a second material and which surrounds, from the outside, the inner part (8). The first material has a higher strength than the second material, and the inner part (8) is connected in a positive fit in the rotational direction of the outer part (3) by an outer form which is irregular in the cross-section to the rotational axis (14) of the rotor (1).

Abstract: A camshaft adjusting device, including a vane cell adjuster having a stator connectable to a crankshaft and a rotor, which is rotatably supported in the stator and connectable to a camshaft. Webs on the stator, divide an annular space between the stator and the rotor into pressure chambers, wherein the rotor has a rotor hub and vanes extending radially outward from the rotor hub, which vanes divide the pressure chambers into two groups of working chambers having a different acting direction, into each of which working chambers pressure medium flowing in or out in a pressure-medium circuit can be admitted, and a central locking device for locking the rotor in relation to the stator.

Abstract: A hydraulic valve for a cam phaser and including a housing; a hollow cylindrical piston which is supported axially movable in a central opening extending along a longitudinal axis of the housing; a supply connection feeding a hydraulic fluid; and at least a first operating connection, a second operating connection and a tank connection, wherein one of the first operating connection or the second operating connection is connectable through an interior space of the piston with the supply connection and another of the first operating connection or the second operating connection is connectable with the tank connection as a function of a position of a position of the piston along the longitudinal axis of the housing, wherein the piston includes a first flow through opening and a second flow through opening connecting the interior space of the piston with the first operating connection and the second operating connection.

Abstract: A multipart rotor (1) for a hydraulic camshaft adjuster (2) is provided, the multipart rotor having a rotor main body (3) which, together with a first rotor secondary body (4), forms hydraulic means-conducting channels (9) oriented in a radial direction, the first rotor secondary body (4) being arranged radially within the rotor main body (3).

Abstract: An engine having improved volumetric efficiency may include a cylinder, an intake valve, a piston, an exhaust valve and a crankshaft. The cylinder may include a cylinder bore. The intake valve may be configured to introduce a fuel and an air into the cylinder bore. The piston may be slidably arranged in the cylinder bore. The piston may be configured to convert an explosive power of an exhaust gas, which may be generated by combusting the fuel, into a linear driving force. The exhaust valve may be configured to exhaust the exhaust gas from the cylinder bore. The crankshaft may be connected with the piston to convert the linear driving force into a rotary driving force. The intake valve and the exhaust valve may be simultaneously opened within a rotation angle of about 3° to about 12° of the crankshaft.