Ina Walzlager Schaeffler Ohg

Ina Walzlager Schaeffler Kg

Ina Schaeffler Kg

Fev Motorentechnik Gmbh & Co Kg

Schaeffler Technologies Ag & Co .Kg

Ina W&auml;lzlager Schaeffler Ohg

Martin Scheidt

Andreas Strauss

Eduard Golovatai-Schmidt

Jens Schafer

Dieter Goppelt

Oliver Schnell

Peter Sailer

Peter Kreuter

Martin Steigerwald

Michael Schebitz

Dirk Heintzen

Ulrich Muller

Michael Haag

Matthias Kapp

Enno Lohse

Stefan Hess

Dieter Neller

Bernd Reuter

Manfred Wilhelm

Eduard Golovatal-Schmidt

Michael Elicker

Matthias Lang

A method of variable valve timing in an internal combustion engine in which the valve opening and closing timing of the actuated gas exchange valves of the internal combustion engine can be varied as a function of engine speed by adjusting means for adjusting at least one camshaft relative to a crankshaft, said internal combustion engine comprising hydraulic valve lash adjusters for adjusting a valve lash of the gas exchange valves, said lash adjusters being configured at least on one of an inlet side and an outlet side as idle stroke elements which, when actuated, at first produce an engine speed-dependent idle stroke and to provide a method of variable valve timing for internal combustion engines comprising a camshaft adjustment and a hydraulic valve adjustment with an idle stroke function that guarantees favorable valve timing in all operational situations of the internal combustion engine and, at the same time, improves the thermodynamic exploitation of such internal combustion engines, at each adjustment of the at least one camshaft, the respective idle stroke of the valve lash adjusters is taken into account.

Method of variable valve timing in an internal combustion engine

A device for changing the control times of gas exchange valves of an internal combustion engine, including a drive wheel in driving connection with a crankshaft and a vane wheel connected to rotate with a camshaft. A plurality of hydraulic working spaces are formed within the device and are divided by the vanes of the vane wheel into respectively A and B pressure chambers. The vane wheel can be mechanically coupled to the drive wheel by a locking element, which is displaceable by a spring element into a locking position within a seat in one of the sidewalls of the drive wheel, and is hydraulically moved into an unlocked position in the vane wheel upon application of pressure to the pressure chambers. The locking element is a generally uniform cylindrical locking pin, and is arranged in an axial bore in the hub of the vane wheel. The longitudinal axis of the axial bore has a smallest possible distance from the longitudinal mid-axis of the device. The seat has a generally quadrilateral shaped contour that is larger by a play on all sides than the cross sectional area of the locking element, and includes a worm groove opening into it for supplying pressure medium.

DEVICE FOR CHANGING THE CONTROL TIMES OF GAS EXCHANGE VALVES OF INTERNAL COMBUSTION ENGINE, PARTICULARLY ROTARY PISTON ADJUSTMENT DEVICE FOR ROTATION ANGLE ADJUSTMENT OF A CAMSHAFT RELATIVE TO A CRANKSHAFT

The invention concerns a device for the hydraulic adjustment of the angular position of a shaft ( ) relative to a drive pinion ( ), said device comprising a plate ( ) fixed to the shaft to cooperate with the drive pinion ( ) or with a component fixed to the drive pinion. The device comprises at least one ring-segment shaped section ( ) in the plate ( ) and a means ( ) arranged on the drive pinion ( ) or on said component to cooperate with the shaped section ( ) so as to divide the shaped section into two separate chambers ( ). The device further comprises a means for a selective hydraulic pressurization of the chambers ( ) for adjusting the relative angular position of the drive pinion ( ) and the shaft ( ).

Device for hydraulically adjusting the angle of rotation of a shaft relative to a driving wheel

A system for the rotation of a camshaft relative to a crankshaft of an internal combustion engine, which includes a drive pulley connected to the crankshaft of the engine through a chain, belt, or sprocket drive, and includes an electric motor that transfers torque to the camshaft of the engine. The electric motor is flanged directly to one end of the and is a primary drive unit of the camshaft as well as a servomechanism to adjust and maintain a controlled camshaft angular shift, whereas the drive pulley is fastened to and moves about the other end of the camshaft within a defined range of rotation and is provided as a forced synchronization instrument for the electric motor within the range of rotation, as well as being a secondary drive unit of the camshaft. Further, the electric motor ( ) is connected to an RPM controller ( ) that synchronizes and modifies the RPM of the electric motor ( ) relative to the RPM of the drive pulley ( ).

System for the rotation of a camshaft relative to a crankshaft of an internal combustion engine

The invention concerns a device for varying valve timing of gas exchange valves of an internal combustion engine, particularly a hydraulic camshaft adjusting device of a rotary piston type, said device comprising a drive pinion ( ) connected in driving relationship to a crankshaft of the internal combustion engine and a winged wheel ( ) connected rotationally fast to a camshaft of the internal combustion engine. The drive pinion ( ) comprises a hollow space formed by a circumferential wall ( ) and two side walls ( ), at least one hydraulic working chamber ( ) being formed in the hollow space by at least two limiting walls ( ). The winged wheel ( ) comprises at least one radial wing ( ), and with each wing ( ) it divides one hydraulic working chamber ( ) into two hydraulic pressure chambers ( ) which, when pressurized by a hydraulic pressure medium effect a pivoting or a fixing of the winged wheel ( ) relative to the drive pinion ( ). When the internal combustion engine is switched off, the camshaft is rotated into a preferred basic position for starting the internal combustion engine, and in this position, the winged wheel ( ) can be mechanically coupled to the drive pinion ( ) by a lock. The novel lock is configured as a cage-guided free-wheel ( ) arranged between the winged wheel ( ) and the drive pinion ( ) and comprises at least one clamping body ( ) that blocks the direction of rotation of the winged wheel ( ) opposed to the basic position of the camshaft. The cage ( ) of the free-wheel ( ) is configured at least partly as a pressure application surface ( ) for the hydraulic pressure medium for unlocking the free-wheel ( ).

Device for varying valve timing of gas exchange valves of internal combustion engines, particularly a hydraulic camshaft adjusting device of a rotary piston type

A hydraulic camshaft-adjusting device of the rotary piston type having a drive gear ( ) and an impeller. The drive gear ( ) has a cavity formed from a perimeter wall and two side walls ( ) inside of which at least one hydraulic working chamber is formed from at least two boundary walls ( ). The impeller has a wheel hub ( ) with at least one vane that extends into a working chamber, dividing the chamber into two associated hydraulic pressure chambers. The pressure medium feed to and from the pressure chambers is done using a pressure medium tap ( ) on the side facing a camshaft as well as using pressure medium channels ( ) incorporated into the axial sides ( ) of the wheel hub ( ) of the impeller, which are connected to the pressure medium tap through a pressure medium distributor ( ). The pressure medium tap ( ) and the pressure medium distributor ( ) are encircled at the head ( ) and the outer surface ( ) by a respective penetration ( ) in the side walls ( ) of the drive gear ( ). The gaps between the head ( ) of the pressure medium distributor ( ) at the penetration ( ) of the one side wall ( ) of the drive gear ( ) and between the outer surface ( ) of the pressure medium tap ( ) and the penetration ( ) at the other side wall ( ) of the drive gear ( ) are sealed off through wear-resistant sealing media against pressure medium leakage

Device for changing the control timing of the gas exchange valves of an internal combustion engine, in particular a hydraulic camshaft adjustment device of the rotary piston type

A device provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft ( ) and a crankshaft ( ) includes a hydraulic cylinder ( ). This hydraulic cylinder ( ) is acted upon by a supply unit ( ) which displaces gas cushions in the hydraulic cylinder ( ) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.

Adjusting cylinder of a camshaft adjusting device acted upon by a separate oil supply unit

A device for varying the control times of gas-exchange valves of an internal combustion engine, which has between the impeller (,) and the drive wheel (,) an additional angle-limiting device (,) with the aid of which the maximum pivoting angle of the impeller, which is limited per se by the lateral surfaces (,) of the bounding walls (,) in the drive wheel (,), can be reduced with respect to the drive wheel (,) to a smaller pivoting angle.

Device for varying the control times of gas-exchange valves of an internal combustion engine in particular a camshaft adjusting device with an impeller

An electromagnetic actuator for operating a setting member includes an electromagnet which has a housing provided with a recess having an opening; a yoke body having a surface constituting a pole face of the electromagnet; and a solenoid surrounding the yoke body. The yoke body and the solenoid are accommodated in the housing recess. An armature, to which the setting member is coupled, is guided for motions towards and away from the pole face in a space adjoining the electromagnet. The opening of the housing recess faces the space. A resetting spring exerts a force opposing a motion of the armature towards the pole face.

Electromagnetic actuator and housing therefor

An arrangement for controlling a device for changing the control times of gas exchange valves of an internal combustion engine is provided. The device includes a hydraulic pressure cylinder with an axially movable piston the setting motions of which are transformed into relative rotation of a drive part of the pressure cylinder connected to the crankshaft in relation to a drive part of the pressure cylinder connected to the camshaft. the hydraulic pressure cylinder is subdivided by the piston into two pressure chambers (3, 4), with each being provided with a pressure medium connection (5, 6) to which a hydraulic pump (7) is connected upstream and a pressure medium reservoir (8) is connected downstream, and whose pressure medium inflow or pressure medium outflow is controlled by a hydraulic valve arrangement controlled by a motor controller (9).

Arrangement for controlling a device for changing the valve timing of an

Device for changing the opening and closing times of the gas-exchange

A device provided on a internal combustion piston engine for changing the rotational relations between at least one camshaft (5) and a crankshaft (6) includes a hydraulic cylinder (4). This hydraulic cylinder (4) is acted upon by a supply unit (7, 14) which displaces gas cushions in the hydraulic cylinder (4) when the internal combustion piston engine is at a standstill and replaces the gas cushions with hydraulic cylinder, especially motor oil.

Adjusting cylinder of a camshaft adjusting device acted upon by a

Arrangement in camshaft adjusters for preventing starting noises

The invention relates in particular to a camshaft setting mechanism according to the vane cell principle, which has a drive gear (1) joined with the crankshaft through a toothed belt or a control chain. The drive gear includes a hollow space (8), and an impeller (11) is installed in the hollow space (8). The impeller is fixedly connected to and rotates with the camshaft (14). The drive gear (1) has at least one working chamber (4) on the interior of its circumferential wall (2), and each vane (12) of the impeller (11) subdivides the working chambers (4) into two pressure areas (9, 10) in each case. To avoid leakage through the slits (13) between impeller (11) and the drive gear (1) at high oil temperatures, the impeller (11) is made of a material which has a higher thermal expansion coefficient than the material of the drive gear (1), and that the pressure areas (9, 10) in the hollow space (7) of the drive gear (1) are sealed off by thermal expansion of the impeller (11) when the motor is in operation.

Device for varying the valve control timing of an internal combustion

Apparatus for adjusting a rotational relation between a camshaft and a timing pulley of an internal combustion engine of a type having a crankshaft for driving the timing pulley and a cylinder head for rotatably supporting the camshaft, includes a housing receiving a double-acting piston for displacement in an axial direction between two axially spaced end positions and defining with the housing two pressure compartments. Secured to the piston is a control bushing which is geared to the timing pulley via a first gearing and operatively connected to the camshaft via a second gearing. A hydraulic regulating unit is fluidly connected to the pressure compartments via fluid-carrying passageways for alternately supplying a pressure fluid to the pressure compartments to effect an axial displacement of the piston and thereby a positional adjustment of the control bushing, with the fluid-carrying passageways including, for movement of the piston into one of the end positions, two axially spaced distribution spaces which are fluidly connected to each other by transition zones arranged in angularly offset disposition.

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Adelsdorf, Germany

Martin Scheidt