EP2321501B1 - Device for variable adjustment of the timing of gas exchange valves of an internal combustion engine - Google Patents
Device for variable adjustment of the timing of gas exchange valves of an internal combustion engine Download PDFInfo
- Publication number
- EP2321501B1 EP2321501B1 EP09781129A EP09781129A EP2321501B1 EP 2321501 B1 EP2321501 B1 EP 2321501B1 EP 09781129 A EP09781129 A EP 09781129A EP 09781129 A EP09781129 A EP 09781129A EP 2321501 B1 EP2321501 B1 EP 2321501B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- camshaft
- pressurizing means
- pressure medium
- distributor
- duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 15
- 230000010363 phase shift Effects 0.000 abstract 3
- 239000000314 lubricant Substances 0.000 description 12
- 230000002093 peripheral effect Effects 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0475—Hollow camshafts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
- F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
- F01L2001/34423—Details relating to the hydraulic feeding circuit
- F01L2001/34426—Oil control valves
- F01L2001/34433—Location oil control valves
Definitions
- the invention relates to a device for variably setting the timing of gas exchange valves of an internal combustion engine with a hydraulic phase adjusting device, a camshaft and a pressure medium distributor, wherein the phase adjusting device can be brought into drive connection with a crankshaft and rotatably connected to the camshaft, wherein a phase angle of the camshaft relative to Crankshaft is variably adjustable by means of the phase adjusting device, wherein the interior of the camshaft has a cavity which communicates with one or more camshaft bearings, which are formed separately from a pressure medium rotary transformer, wherein the pressure medium distributor is arranged in a receiving area of the camshaft, wherein the camshaft in the area of the pressure medium distributor has an opening which communicates on the one hand with the interior of the camshaft and on the other hand with the pressure medium rotary transformer, wherein within the camshaft a Druc kstoffpfad is formed, which communicates on the one hand with the opening and on the other hand with the hydraulic phase adjusting device.
- the device usually consists of a camshaft, a hydraulic phase adjusting device, by means of which a phase relation between the crankshaft and the camshaft can be selectively changed by pressure medium supply or discharge, and a pressure medium distributor, by means of which the phase adjusting means pressure medium can be supplied or discharged from this.
- the phase adjusting device is integrated in a drive train, via which torque is transmitted from the crankshaft to the camshaft.
- This drive train can be realized for example as a belt, chain or gear drive.
- Such a device is for example from the US Pat. No. 6,799,544 B1 known.
- the device comprises a phase adjusting device, a central screw and a camshaft which is mounted in the cylinder head of the internal combustion engine by means of a plurality of camshaft bearings.
- the phase adjusting device has an output element, which is arranged rotatably to a drive element.
- the drive element is in drive connection with the crankshaft.
- the device In the axial direction, the device is limited by a respective side cover.
- the output element, the drive element and the two side covers define a plurality of pressure chambers, wherein each of the pressure chambers is divided by a wing into two counteracting pressure chambers.
- the phase adjusting device is rotatably connected by means of the central screw with the camshaft.
- the central screw passes through a central opening of the output element and is supported on its side facing away from the camshaft side surface on the driven element.
- a control valve is arranged in the region of the central opening, to which pressure medium is supplied via a camshaft bearing. By means of the control valve, the pressure medium flows to or from the pressure chambers and thus the phase relation between the crankshaft and camshaft are controlled.
- a disadvantage of this embodiment is that per camshaft bearing complex lubricant supply lines must be formed within the cylinder head to supply the camshaft bearings lubricant. This considerably increases the complexity and the manufacturing cost of the cylinder head.
- the invention has for its object to provide a device for variable adjustment of the timing of gas exchange valves of an internal combustion engine, the lubricant supply of the camshaft bearing should be simplified.
- a second pressure medium channel is provided which communicates on the one hand with the opening and on the other hand with the cavity, wherein the second pressure medium channel is at least partially formed by the pressure medium distributor.
- the pressure medium distributor is provided with a threaded portion, by means of which the phase adjusting device can be fastened to the camshaft.
- the pressure medium distributor has a control valve, by means of which the phase adjusting device can be supplied with pressure medium.
- the pressure medium distributor can pass through a central opening of the phase adjusting device.
- the second pressure medium channel can be formed, for example, within the pressure medium distributor. Alternatively it can be provided to form the second pressure medium channel at an interface between the cavity and the pressure medium distributor. It can be provided, for example, that the second pressure medium channel as a longitudinal groove on an outer circumferential surface of the pressure medium distributor or is formed on an inner circumferential surface of the camshaft in the region of the pressure medium distributor.
- the pressure medium rotary transformer may be formed, for example, as a camshaft bearing.
- the pressure medium path is at least partially formed by the pressure medium distributor.
- the device has at least one hydraulic phase adjusting device on a camshaft and a pressure medium distributor.
- the phase adjusting device comprises at least one drive element and an output element.
- the drive element is in the assembled state of the device via a traction drive, such as a belt or chain drive, or a gear drive, with the crankshaft in drive connection.
- the output member is pivotally mounted in an angular range relative to the drive element and rotatably secured to the camshaft.
- At least one pressure chamber is provided, by the pressurization of which the output element relative to the drive element and thus the camshaft can be pivoted relative to the crankshaft.
- one or more pairs of mutually acting pressure chambers are provided.
- the camshaft is designed as a hollow shaft with a cavity. This can be realized, for example, by the fact that the camshaft consists of a tube, whose one end is closed and on the cam force, are fixed or cohesively. But also conceivable are solidly executed camshafts, which have an axial channel, in the form of a blind hole, which opens into a receptacle in which the pressure medium distributor is arranged.
- the camshaft is supported in a plurality of camshaft bearings, the cavity communicating with at least one of the camshaft bearings via radial openings in the camshaft.
- the pressure medium distributor is received in a receptacle of the camshaft, said receptacle communicating with the cavity.
- the receptacle may be part of the cavity, for example.
- the camshaft has an opening in the region of the receptacle in which the pressure medium distributor is arranged.
- a pressure medium rotary transformer is arranged. This can surround the camshaft, for example, completely in the circumferential direction.
- the pressure medium rotary transformer can be designed as a camshaft bearing or as a separate component.
- About the pressure medium rotary transformer and the opening is supplied to the interior of the camshaft during operation of the internal combustion engine permanently or at intervals pressure medium.
- the pressure medium distributor separates a pressure medium path which is provided for supplying the phase adjusting device by a second pressure medium channel, which opens into the cavity of the camshaft and over which the camshaft bearing separate from the pressure medium rotary transformer are supplied with lubricant.
- the pressure medium distributor closes the cavity, apart from the second pressure medium channel, pressure-tight to the outside.
- a filter element can be integrated in the second pressure medium channel, which keeps foreign bodies in the lubricant or pressure medium away from the camshaft bearings and thus reduces the wear of the bearing points. Since all camshaft bearings are supplied with lubricant / pressure medium via the second pressure medium channel, only a single filter element is required in this embodiment.
- the pressure medium rotary transformer can fulfill other functions in addition to the leadership of the lubricant / pressure medium flows.
- a threaded portion may be formed on this, by means of which the phase adjusting device, such as the output member, rotatably connected to the camshaft can be connected.
- the pressure medium distributor has a control valve, via which the pressure medium flows can be controlled to and from the pressure chambers of the phase adjusting device.
- the second pressure medium channel which communicates on the one hand with the opening and thus with the pressure medium rotary transformer and on the other hand with the cavity of the camshaft is at least partially formed by the pressure medium distributor.
- a pressure medium distributor in the interior of a Bore is provided, which branches off from the pressure medium path, which supplies the phase adjusting device with pressure medium.
- the second pressure medium channel is formed solely by the pressure medium distributor.
- the second pressure medium channel is formed at an interface between the pressure medium distributor and the camshaft, for example an inner lateral surface of the camshaft and an outer lateral surface of the pressure medium distributor. This can be realized for example by a longitudinal groove which is formed on the outer circumferential surface of the pressure medium distributor or the inner circumferential surface of the camshaft.
- a minimum flow area of the second pressure medium channel is made smaller than a minimum flow area of the pressure medium path between the opening and the phase adjusting device.
- the second pressure medium channel may have a throttle point.
- the throttle point may for example be realized by means of a separate component, which is arranged in the second pressure medium channel.
- FIG. 1 an internal combustion engine 1 is sketched, wherein a seated on a crankshaft 2 piston 3 is indicated in a cylinder 4.
- the crankshaft 2 is in the illustrated embodiment via a respective traction drive 5 with an intake camshaft 6 and exhaust camshaft 7 in combination, with a first and a second device 11 for a relative rotation between the crankshaft 2 and the camshafts 6, 7 can provide.
- Cams 8 of the camshafts 6, 7 actuate one or more inlet gas exchange valves 9 or one or more Auslassgas scaffoldventile 10.
- it may be provided only one of the camshafts 6, 7 with a device 11, or provide only a camshaft 6, 7, which with a Device 11 is provided.
- FIGS. 2 and 3 show a first embodiment of a device 11 according to the invention in longitudinal or in cross section.
- the device 11 has a phase adjusting device 12, a camshaft 6, 7 and a pressure medium distributor 13.
- the phase adjusting device 12 comprises a drive element 14 and an output element 16.
- the drive element 14 has a housing 15 and two side covers 17, 18, which are arranged on the axial side surfaces of the housing 15.
- the output element 16 is designed in the form of an impeller and has a substantially cylindrical hub member 19, extend from the outer cylindrical surface in the illustrated embodiment, five wings 20 in the radial direction outwardly. Starting from an outer peripheral wall 21 of the housing 15, five projections 22 extend radially inwardly. In the illustrated embodiment, the projections 22 and the wings 20 are integrally formed with the peripheral wall 21 and the hub member 19, respectively.
- the drive element 14 is arranged by means of radially inner circumferential walls of the projections 22 relative to the output member 16 rotatable thereto.
- a sprocket 23 is formed, via which by means of a chain drive, not shown, torque can be transmitted from the crankshaft 2 to the drive member 14.
- the output member 16 is rotatably connected to the camshaft 6,7.
- the pressure medium distributor 13 is provided with a threaded portion 24 which engages in a threaded portion 25 of the camshaft 6, 7.
- the pressure medium distributor 13 passes through a central opening 16a of the output element 16. A shoulder of the pressure medium distributor 13 rests against the side surface of the output element 16 facing away from the camshaft 6, 7.
- a screw 27 passes through an opening of the second side cover 18, an axial opening 26 and an opening of the first side cover 17. In this case engages a threaded portion of the screw 27 in a threaded portion which in the Opening of the first side cover 17 is formed.
- a pressure space 28 is formed between each two circumferentially adjacent projections 22.
- Each of the pressure chambers 28 is circumferentially bounded by opposing, substantially radially extending boundary walls 29 of adjacent projections 22, in the axial direction of the side covers 17, 18, radially inwardly of the hub member 19 and radially outwardly of the peripheral wall 21.
- a wing 20 In each of the pressure chambers 28 projects a wing 20, wherein the wings 20 are formed such that they rest against both the side covers 17, 18, and on the peripheral wall 21. Each wing 20 thus divides the respective pressure chamber 28 into two counteracting pressure chambers 30, 31.
- the output element 16 is arranged rotatably in a defined Winkelbreich to the drive element 14.
- the angular range is limited in one direction of rotation of the driven element 16 in that the wings 20 come into contact with a corresponding boundary wall 29 (early stop 32) of the pressure chambers 28.
- the angular range in the other direction of rotation is limited by the fact that the wings 20 come to rest on the other boundary walls 29 of the pressure chambers 28, which serve as a late stop 33.
- phase position of the drive element 14 to the output element 16 can be varied.
- phase position can be kept constant.
- the pressure medium distributor 13 is provided with a control valve 34.
- the control valve 34 comprises a substantially hollow cylindrical valve housing 35 and a control piston 36 which disposed axially displaceable within the valve housing 35 is.
- the valve housing 35 is provided with an inlet port P, a drain port T, and two working ports A, B.
- the pressure medium distributor 13 passes through the central opening 16a of the output element 16, wherein the camshaft-facing portion in a receptacle 37 of the hollow camshaft 6, 7 is arranged.
- the camshaft 6, 7 has in the region of the receptacle 37 a plurality of openings 38, on the one hand with a pressure medium rotary transformer 39, which at least partially surrounds the camshaft 6, 7, and on the other hand with the interior of the camshaft 6, 7 communicate.
- the pressure medium rotary transformer 39 is simultaneously formed as a camshaft bearing 50.
- About the pressure medium rotary transformer 39 and the openings 38 is supplied to the interior of the camshaft 6, 7 during operation of the internal combustion engine 1 pressure medium from the lubricant circuit.
- the pressure medium rotary transformer 39 is designed separately from the camshaft bearings 50 and only the pressure medium transfer between the cylinder head fixed components and the camshaft 6, 7 allows.
- the pressure medium distributor 13 is designed and arranged such that a pressure medium path 40 is formed, which communicates on the one hand with the openings 38 and on the other hand with the inlet port P.
- the pressure medium path 40 consists of a first pressure medium channel 41 between the outer lateral surface of the pressure medium distributor 13 and the inner lateral surface of the camshaft 6, 7, which communicates with radial openings 42, which in turn communicate with the interior of the pressure medium distributor 13. From there, the pressure medium passes through a check valve 43 and an axial channel 44 to the inlet port P.
- the pressure medium reaches either the first or second working port A, B and from there via radial pressure medium lines 45, 46 to the first and second pressure chambers 30, 31.
- the pressure medium from the other pressure chambers 30, 31 via the pressure medium lines 45, 46 returned to the control valve 34 and ⁇ -ejected via the drain port.
- the axial position of the control piston 36 relative to the valve housing 35 is selectively adjustable by means of an electromagnetic actuator 47.
- a second pressure medium channel 48 is provided, which communicates on the one hand via the radial openings 42 and the first pressure medium channel 41 with the openings 38 and on the other hand with a cavity 49 of the hollow camshaft 6, 7.
- the second pressure medium channel 48 is in the in the Figures 2 and 4 illustrated embodiments designed as an axial bore, which passes through the threaded portion 24.
- the cavity 49 extends as in FIG FIG. 4 represented over the entire length of the camshaft 6, 7, wherein the phase adjusting device 12 facing away from the side formed closed and limited by the pressure medium distributor 13 in the other direction.
- the pressure medium distributor 13 seals the cavity 49, apart from the second pressure medium channel 48, to the outside.
- the camshaft 6, 7 is rotatably mounted in the cylinder head of the internal combustion engine 1 by means of one or more camshaft bearings 50.
- at least one, advantageously a plurality, radial openings 51 are provided which communicate on the one hand with the cavity 49 and on the other hand with the bearing surface of the camshaft bearing 50.
- the camshaft bearing 50 is supplied via the pressure medium rotary transformer 39, the openings 38, the first pressure medium channel 41, the radial openings 42, the second pressure medium channel 48, the cavity 49 and the radial openings 51 lubricant.
- a filter element 54 is provided, which frees the pressure fluid / lubricant flow to the camshaft bearings and the phase adjusting device 12 of impurities.
- the filter element 54 is formed as a ring filter.
- a throttle 52 is provided within the second pressure medium channel 48, which limits the flow of pressure medium from the pressure medium rotary transformer 39 to the bearing surfaces of the camshaft bearings 50, without hindering the pressure medium flow to the phase adjusting device 12.
- the throttle 52 is formed separately from the pressure medium manifold 13 and fixed in the second pressure medium channel 48, for example by a positive, material or non-positive connection attached.
- the diameter of the second pressure medium channel 48 is designed in such a way that it causes the throttling function ( FIG. 2 ) or in which the throttle 52 is formed on the pressure medium distributor 13.
- the minimum flow area of the second pressure medium channel 48 is smaller than the minimum flow area between the pressure medium rotary transformer 39 and the pressure chambers 30, 31.
- FIG. 5 shows a further embodiment according to the invention of the device 11, which is formed substantially identical to the first two embodiments.
- the second pressure medium channel 48 is formed at the interface between the inner circumferential surface of the camshaft 6, 7 and the outer circumferential surface of the pressure medium distributor 13.
- a longitudinal groove 53 is provided, which communicates on the one hand with the cavity 49 and on the other hand with the first pressure medium channel 41.
- the longitudinal groove 53 may be formed, for example, on the inner circumferential surface of the camshaft 6, 7 or the outer circumferential surface of the pressure medium distributor 13. In any case, therefore, the second pressure medium channel 48 is partially limited by the pressure medium distributor 13.
- the longitudinal groove 53 may have a constant small cross section or a local throttle point.
- one or more of the pressure medium rotary transformer 39 separate camshaft bearing 50 can be supplied with lubricant.
- the usual in the cylinder head structures for supplying lubricant to each individual camshaft bearing 50 can be omitted, whereby the complexity and the cost of the cylinder head can be reduced.
- the pressure medium supply of all camshaft bearing 50 via the cavity 49 of the camshaft 6, 7 only a pressure medium supply to the camshaft 6, 7 is necessary, via which the phase adjusting device 12 is supplied simultaneously.
- the formation of the second pressure medium channel 48 through the pressure medium distributor 13 significantly reduces the costs and complexity of the device 11.
- the supply of the phase adjusting device 12 and the camshaft bearings 50 can be realized by means of a single component, whereby the assembly cost drops considerably.
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Abstract
Description
Die Erfindung betrifft eine Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine mit einer hydraulischen Phasenstelleinrichtung, einer Nockenwelle und einem Druckmittelverteiler, wobei die Phasenstelleinrichtung in Antriebsverbindung mit einer Kurbelwelle bringbar ist und drehfest mit der Nockenwelle verbunden ist, wobei eine Phasenlage der Nockenwelle relativ zur Kurbelwelle mittels der Phasenstelleinrichtung variabel einstellbar ist, wobei das Innere der Nockenwelle einen Hohlraum aufweist, der mit einem oder mehreren Nockenwellenlagern, die separat zu einem Druckmitteldrehübertrager ausgebildet sind, kommuniziert, wobei der Druckmittelverteiler in einem Aufnahmebereich der Nockenwelle angeordnet ist, wobei die Nockenwelle im Bereich des Druckmittelverteilers eine Öffnung aufweist, die einerseits mit dem Inneren der Nockenwelle und andererseits mit dem Druckmitteldrehübertrager kommuniziert, wobei innerhalb der Nockenwelle ein Druckmittelpfad ausgebildet ist, der einerseits mit der Öffnung und andererseits mit der hydraulischen Phasenstelleinrichtung kommuniziert.The invention relates to a device for variably setting the timing of gas exchange valves of an internal combustion engine with a hydraulic phase adjusting device, a camshaft and a pressure medium distributor, wherein the phase adjusting device can be brought into drive connection with a crankshaft and rotatably connected to the camshaft, wherein a phase angle of the camshaft relative to Crankshaft is variably adjustable by means of the phase adjusting device, wherein the interior of the camshaft has a cavity which communicates with one or more camshaft bearings, which are formed separately from a pressure medium rotary transformer, wherein the pressure medium distributor is arranged in a receiving area of the camshaft, wherein the camshaft in the area of the pressure medium distributor has an opening which communicates on the one hand with the interior of the camshaft and on the other hand with the pressure medium rotary transformer, wherein within the camshaft a Druc kmittelpfad is formed, which communicates on the one hand with the opening and on the other hand with the hydraulic phase adjusting device.
In modernen Brennkraftmaschinen werden Vorrichtungen zur variablen Einstellung der Steuerzeiten von Gaswechselventilen eingesetzt, um die Phasenrelation zwischen Kurbelwelle und Nockenwelle in einem definierten Winkelbereich, zwischen einer maximalen Früh- und einer maximalen Spätposition, variabel gestalten zu können. Die Vorrichtung besteht üblicherweise aus einer Nockenwelle, einer hydraulischen Phasenstelleinrichtung, mittels derer durch Druckmittelzufuhr, bzw. -abfuhr eine Phasenrelation zwischen der Kurbelwelle und der Nockenwelle gezielt verändert werden kann, und einem Druckmittelverteiler, mittels dem der Phasenstelleinrichtung Druckmittel zugeführt bzw. von dieser abgeführt werden kann. Zu diesem Zweck ist die Phasenstelleinrichtung in einen Antriebsstrang integriert, über welchen Drehmoment von der Kurbelwelle auf die Nockenwelle übertragen wird. Dieser Antriebsstrang kann beispielsweise als Riemen-, Ketten- oder Zahnradtrieb realisiert sein.In modern internal combustion engines devices for variable adjustment of the timing of gas exchange valves are used to make the phase relation between the crankshaft and camshaft in a defined angular range, between a maximum early and a maximum late position variable. The device usually consists of a camshaft, a hydraulic phase adjusting device, by means of which a phase relation between the crankshaft and the camshaft can be selectively changed by pressure medium supply or discharge, and a pressure medium distributor, by means of which the phase adjusting means pressure medium can be supplied or discharged from this. For this purpose, the phase adjusting device is integrated in a drive train, via which torque is transmitted from the crankshaft to the camshaft. This drive train can be realized for example as a belt, chain or gear drive.
Eine derartige Vorrichtung ist beispielsweise aus der
Die Phasenstelleinrichtung ist mittels der Zentralschraube drehfest mit der Nockenwelle verbunden. Dabei durchgreift die Zentralschraube eine Zentralöffnung des Abtriebselements und stützt sich an deren der Nockenwelle abgewandten Seitenfläche an dem Abtriebselement ab. Innerhalb der Zentralschraube ist im Bereich der Zentralöffnung ein Steuerventil angeordnet, dem über ein Nockenwellenlager Druckmittel zugeführt wird. Mittels des Steuerventils werden die Druckmittelströme zu bzw. aus den Druckkammern und damit die Phasenrelation zwischen Kurbelwelle und Nockenwelle gesteuert.The phase adjusting device is rotatably connected by means of the central screw with the camshaft. In this case, the central screw passes through a central opening of the output element and is supported on its side facing away from the camshaft side surface on the driven element. Within the central screw, a control valve is arranged in the region of the central opening, to which pressure medium is supplied via a camshaft bearing. By means of the control valve, the pressure medium flows to or from the pressure chambers and thus the phase relation between the crankshaft and camshaft are controlled.
Nachteilig an dieser Ausführungsform ist, dass pro Nockenwellenlager aufwändige Schmiermittelzuleitungen innerhalb des Zylinderkopfes ausgebildet werden müssen um den Nockenwellenlagern Schmiermittel zuzuführen. Dies erhöht die Komplexität und die Herstellungskosten des Zylinderkopfes beträchtlich.A disadvantage of this embodiment is that per camshaft bearing complex lubricant supply lines must be formed within the cylinder head to supply the camshaft bearings lubricant. This considerably increases the complexity and the manufacturing cost of the cylinder head.
Der Erfindung liegt die Aufgabe zugrunde eine Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine zu schaffen, wobei die Schmiermittelversorgung der Nockenwellenlager vereinfacht werden soll.The invention has for its object to provide a device for variable adjustment of the timing of gas exchange valves of an internal combustion engine, the lubricant supply of the camshaft bearing should be simplified.
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass ein zweiter Druckmittelkanal vorgesehen ist, der einerseits mit der Öffnung und andererseits mit dem Hohlraum kommuniziert, wobei der zweite Druckmittelkanal zumindest teilweise von dem Druckmittelverteiler ausgebildet ist.The object is achieved in that a second pressure medium channel is provided which communicates on the one hand with the opening and on the other hand with the cavity, wherein the second pressure medium channel is at least partially formed by the pressure medium distributor.
Dabei kann vorgesehen sein, dass der Druckmittelverteiler mit einem Gewindeabschnitt versehen ist, mittels dem die Phasenstelleinrichtung an der Nockenwelle befestigbar ist.It can be provided that the pressure medium distributor is provided with a threaded portion, by means of which the phase adjusting device can be fastened to the camshaft.
In einer Weiterbildung der Erfindung weist der Druckmittelverteiler ein Steuerventil auf, mittels dem die Phasenstelleinrichtung mit Druckmittel versorgbar ist.In one development of the invention, the pressure medium distributor has a control valve, by means of which the phase adjusting device can be supplied with pressure medium.
Dabei kann der Druckmittelverteiler eine Zentralöffnung der Phasenstelleinrichtung durchgreifen.In this case, the pressure medium distributor can pass through a central opening of the phase adjusting device.
Der zweite Druckmittelkanal kann beispielsweise innerhalb des Druckmittelverteilers ausgebildet sein. Alternativ kann vorgesehen sein, den zweiten Druckmittelkanal an einer Grenzfläche zwischen dem Hohlraum und dem Druckmittelverteiler auszubilden. Dabei kann beispielsweise vorgesehen sein, dass der zweite Druckmittelkanal als Längsnut an einer Außenmantelfläche des Druckmittelverteilers oder an einer Innenmantelfläche der Nockenwelle im Bereich des Druckmittelverteilers ausgebildet ist.The second pressure medium channel can be formed, for example, within the pressure medium distributor. Alternatively it can be provided to form the second pressure medium channel at an interface between the cavity and the pressure medium distributor. It can be provided, for example, that the second pressure medium channel as a longitudinal groove on an outer circumferential surface of the pressure medium distributor or is formed on an inner circumferential surface of the camshaft in the region of the pressure medium distributor.
Der Druckmitteldrehübertrager kann beispielsweise als Nockenwellenlager ausgebildet sein.The pressure medium rotary transformer may be formed, for example, as a camshaft bearing.
Des Weiteren kann vorgesehen sein, dass der Druckmittelpfad zumindest teilweise durch den Druckmittelverteiler ausgebildet ist.Furthermore, it can be provided that the pressure medium path is at least partially formed by the pressure medium distributor.
Die Vorrichtung weist zumindest ein hydraulische Phasenstelleinrichtung eine Nockenwelle und einen Druckmittelverteiler auf. Die Phasenstelleinrichtung umfasst zumindest ein Antriebselement und ein Abtriebselement. Das Antriebselement steht im montierten Zustand der Vorrichtung über einen Zugmitteltrieb, beispielsweise einem Riemen-oder Kettentrieb, oder einen Zahnradtrieb, mit der Kurbelwelle in Antriebsverbindung. Das Abtriebselement ist in einem Winkelbereich schwenkbar relativ zu dem Antriebselement angeordnet und drehfest an der Nockenwelle befestigt.The device has at least one hydraulic phase adjusting device on a camshaft and a pressure medium distributor. The phase adjusting device comprises at least one drive element and an output element. The drive element is in the assembled state of the device via a traction drive, such as a belt or chain drive, or a gear drive, with the crankshaft in drive connection. The output member is pivotally mounted in an angular range relative to the drive element and rotatably secured to the camshaft.
innerhalb der Vorrichtung ist zumindest eine Druckkammer vorgesehen, durch deren Druckbeaufschlagung das Abtriebselement relativ zum Antriebselement und damit die Nockenwelle relativ zur Kurbelwelle verschwenkt werden kann. Vorteilhafterweise sind ein oder mehrere Paare gegeneinander wirkender Druckkammern vorgesehen.Within the device, at least one pressure chamber is provided, by the pressurization of which the output element relative to the drive element and thus the camshaft can be pivoted relative to the crankshaft. Advantageously, one or more pairs of mutually acting pressure chambers are provided.
Die Nockenwelle ist als Hohlwelle mit einem Hohlraum ausgebildet. Dies kann beispielsweise dadurch realisiert sein, dass die Nockenwelle aus einem Rohr besteht, dessen eines Ende verschlossen ist und auf dem Nocken kraft-, formoder stoffschlüssig befestigt sind. Ebenso denkbar sind aber auch massiv ausgeführte Nockenwellen, die einen axialen Kanal, in Form einer Sacklochbohrung aufweisen, der in eine Aufnahme mündet, in der der Druckmittelverteiler angeordnet ist.The camshaft is designed as a hollow shaft with a cavity. This can be realized, for example, by the fact that the camshaft consists of a tube, whose one end is closed and on the cam force, are fixed or cohesively. But also conceivable are solidly executed camshafts, which have an axial channel, in the form of a blind hole, which opens into a receptacle in which the pressure medium distributor is arranged.
Die Nockenwelle ist in mehreren Nockenwellenlagern gelagert, wobei der Hohlraum mit zumindest einem der Nockenwellenlager über radiale Öffnungen in der Nockenwelle kommuniziert. Der Druckmittelverteiler ist in einer Aufnahme der Nockenwelle aufgenommen, wobei diese Aufnahme mit dem Hohlraum kommuniziert. Die Aufnahme kann beispielsweise Teil des Hohlraums sein.The camshaft is supported in a plurality of camshaft bearings, the cavity communicating with at least one of the camshaft bearings via radial openings in the camshaft. The pressure medium distributor is received in a receptacle of the camshaft, said receptacle communicating with the cavity. The receptacle may be part of the cavity, for example.
Die Nockenwelle weist eine Öffnung im Bereich der Aufnahme auf, in der der Druckmittelverteiler angeordnet ist. In diesem Bereich ist ein Druckmitteldrehübertrager angeordnet. Dieser kann die Nockenwelle beispielsweise vollständig in Umfangsrichtung umgreifen. Dabei kann der Druckmitteldrehübertrager als Nockenwellenlager oder als separates Bauteil ausgebildet sein. Über den Druckmitteldrehübertrager und die Öffnung wird dem Inneren der Nockenwelle während des Betriebs der Brennkraftmaschine permanent oder in Intervallen Druckmittel zugeführt. Innerhalb der Nockenwelle trennt der Druckmittelverteiler einen Druckmittelpfad, der zur Versorgung der Phasenstelleinrichtung vorgesehen ist von einem zweiten Druckmittelkanal, der in den Hohlraum der Nockenwelle mündet und über den die von dem Druckmitteldrehübertrager separaten Nockenwellenlager mit Schmiermittel versorgt werden. Der Druckmittelverteiler schließt den Hohlraum, abgesehen von dem zweiten Druckmittelkanal, druckdicht nach außen ab. In dem zweiten Druckmittelkanal kann zusätzlich ein Filterelement integriert sein, der in dem Schmier- bzw. Druckmittel befindliche Fremdkörper von den Nockenwellenlagern fernhält und somit den Verschleiß der Lagerstellen verringert. Da sämtliche Nockenwellenlager über den zweiten Druckmittelkanal mit Schmier- / Druckmittel versorgt werden, wird in dieser Ausführungsform nur ein einziges Filterelement benötigt. Der Druckmitteldrehübertrager kann neben der Führung der Schmier- / Druckmittelströme noch weitere Funktionen erfüllen. Beispielsweise kann ein Gewindeabschnitt an diesem ausgebildet sein, mittels dem die Phasenstelleinrichtung, beispielsweise das Abtriebselement, drehfest mit der Nockenwelle verbunden werden kann. Ebenso denkbar ist, dass der Druckmittelverteiler ein Steuerventil aufweist, über welches die Druckmittelströme zu und von den Druckkammern der Phasenstelleinrichtung gesteuert werden können. Somit können mehrere Funktionalitäten durch ein Bauteil dargestellt werden, wodurch die Anzahl der Bauteile und somit der Montageaufwand, der Bauraumbedarf der Vorrichtung und deren Kosten sinken.The camshaft has an opening in the region of the receptacle in which the pressure medium distributor is arranged. In this area, a pressure medium rotary transformer is arranged. This can surround the camshaft, for example, completely in the circumferential direction. In this case, the pressure medium rotary transformer can be designed as a camshaft bearing or as a separate component. About the pressure medium rotary transformer and the opening is supplied to the interior of the camshaft during operation of the internal combustion engine permanently or at intervals pressure medium. Within the camshaft, the pressure medium distributor separates a pressure medium path which is provided for supplying the phase adjusting device by a second pressure medium channel, which opens into the cavity of the camshaft and over which the camshaft bearing separate from the pressure medium rotary transformer are supplied with lubricant. The pressure medium distributor closes the cavity, apart from the second pressure medium channel, pressure-tight to the outside. In addition, a filter element can be integrated in the second pressure medium channel, which keeps foreign bodies in the lubricant or pressure medium away from the camshaft bearings and thus reduces the wear of the bearing points. Since all camshaft bearings are supplied with lubricant / pressure medium via the second pressure medium channel, only a single filter element is required in this embodiment. The pressure medium rotary transformer can fulfill other functions in addition to the leadership of the lubricant / pressure medium flows. For example, a threaded portion may be formed on this, by means of which the phase adjusting device, such as the output member, rotatably connected to the camshaft can be connected. It is also conceivable that the pressure medium distributor has a control valve, via which the pressure medium flows can be controlled to and from the pressure chambers of the phase adjusting device. Thus, several functionalities can be represented by a component, whereby the number of components and thus the assembly costs, the space requirement of the device and their costs decrease.
Der zweite Druckmittelkanal, der einerseits mit der Öffnung und damit mit dem Druckmitteldrehübertrager und andererseits mit dem Hohlraum der Nockenwelle kommuniziert ist zumindest teilweise von dem Druckmittelverteiler ausgebildet. Denkbar ist beispielsweise ein Druckmittelverteiler, in dessen Innerem eine Bohrung vorgesehen ist, die von dem Druckmittelpfad abzweigt, der die Phasenstelleinrichtung mit Druckmittel versorgt. In diesem Fall ist der zweite Druckmittelkanal alleine durch den Druckmittelverteiler ausgebildet. Ebenso denkbar sind Ausführungsformen, in denen der zweite Druckmittelkanal an einer Grenzfläche zwischen dem Druckmittelverteiler und der Nockenwelle, beispielsweise einer Innenmantelfläche der Nockenwelle und einer Außenmantelfläche des Druckmittelverteilers, ausgebildet ist. Dies kann beispielsweise durch eine Längsnut realisiert werden, die an der Außenmantelfläche des Druckmittelverteilers oder der Innenmantelfläche der Nockenwelle ausgebildet ist.The second pressure medium channel, which communicates on the one hand with the opening and thus with the pressure medium rotary transformer and on the other hand with the cavity of the camshaft is at least partially formed by the pressure medium distributor. It is conceivable, for example, a pressure medium distributor, in the interior of a Bore is provided, which branches off from the pressure medium path, which supplies the phase adjusting device with pressure medium. In this case, the second pressure medium channel is formed solely by the pressure medium distributor. Likewise conceivable are embodiments in which the second pressure medium channel is formed at an interface between the pressure medium distributor and the camshaft, for example an inner lateral surface of the camshaft and an outer lateral surface of the pressure medium distributor. This can be realized for example by a longitudinal groove which is formed on the outer circumferential surface of the pressure medium distributor or the inner circumferential surface of the camshaft.
Vorteilhafterweise ist eine minimale Durchflussfläche des zweiten Druckmittelkanals kleiner ausgeführt, als eine minimale Durchflussfläche des Druckmittelpfads zwischen der Öffnung und der Phasenstelleinrichtung. Beispielsweise kann der zweite Druckmittelkanal eine Drosselstelle aufweisen. Die Drosselstelle kann beispielsweise mittels eines separaten Bauteils realisiert sein, welches in dem zweiten Druckmittelkanal angeordnet ist. Somit kann der Druckmittelstrom zu den Nockenwellenlagern auf das erforderliche Maß reduziert werden, wohingegen der Phasenstelleinrichtung das Druckmittel ungedrosselt zugeführt werden kann. Der hohe Druckmittelstrom zu der Phasenstelleinrichtung führt zu einem hohen Ansprechverhalten und hohen Verstellgeschwindigkeiten. Gleichzeitig wird der benötigte Volumenstrom dadurch begrenzt, dass den Nockenwellenlagern ein geringerer Volumenstrom zugeführt wird. Dies entlastet die Druckmittelpumpe der Brennkraftmaschine.Advantageously, a minimum flow area of the second pressure medium channel is made smaller than a minimum flow area of the pressure medium path between the opening and the phase adjusting device. For example, the second pressure medium channel may have a throttle point. The throttle point may for example be realized by means of a separate component, which is arranged in the second pressure medium channel. Thus, the pressure medium flow to the camshaft bearings can be reduced to the required degree, whereas the phase adjusting device, the pressure medium can be supplied unthrottled. The high pressure medium flow to the phase adjusting device leads to a high response and high adjustment speeds. At the same time, the required volume flow is limited by the fact that the camshaft bearings, a lower flow rate is supplied. This relieves the pressure medium pump of the internal combustion engine.
Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den Zeichnungen in denen Ausführungsbeispiele der Erfindung vereinfacht dargestellt sind. Es zeigen:
- Figur 1
- nur sehr schematisch eine Brennkraftmaschine,
Figur 2- einen Längsschnitt durch eine erste erfindungsgemäße Ausführungsform einer Vorrichtung zur Veränderung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine,
- Figur 3
- einen Querschnitt durch die
Phasenstelleinrichtung aus Figur 2 entlang der Linie III-III, Figur 4- einen Längsschnitt durch eine zweite erfindungsgemäße Ausführungsform einer Vorrichtung analog zu
, wobei nur die Nockenwelle und der Druckmittelverteiler dargestellt sind,Figur 2 - Figur 5
- einen Längsschnitt durch eine dritte erfindungsgemäße Ausführungsform einer Vorrichtung analog zu
, wobei nur die Nockenwelle und der Druckmittelverteiler dargestellt sind.Figur 2
- FIG. 1
- only very schematically an internal combustion engine,
- FIG. 2
- a longitudinal section through a first embodiment according to the invention of a device for changing the timing of gas exchange valves of an internal combustion engine,
- FIG. 3
- a cross section through the phase adjusting device
FIG. 2 along the line III-III, - FIG. 4
- a longitudinal section through a second embodiment according to the invention a device analogous to
FIG. 2 wherein only the camshaft and the pressure medium distributor are shown, - FIG. 5
- a longitudinal section through a third embodiment according to the invention a device analogous to
FIG. 2 , wherein only the camshaft and the pressure medium distributor are shown.
In
Die
Die Phasenstelleinrichtung 12 umfasst ein Antriebselement 14 und ein Abtriebselement 16. Das Antriebselement 14 weist ein Gehäuse 15 und zwei Seitendeckel 17, 18 auf, die an den axialen Seitenflächen des Gehäuses 15 angeordnet sind. Das Abtriebselement 16 ist in Form eines Flügelrades ausgeführt und weist ein im Wesentlichen zylindrisch ausgeführtes Nabenelement 19 auf, von dessen äußerer zylindrischer Mantelfläche sich in der dargestellten Ausführungsform fünf Flügel 20 in radialer Richtung nach außen erstrecken. Ausgehend von einer äußeren Umfangswand 21 des Gehäuses 15 erstrecken sich fünf Vorsprünge 22 radial nach innen. In der dargestellten Ausführungsform sind die Vorsprünge 22 und die Flügel 20 einteilig mit der Umfangswand 21 bzw. dem Nabenelement 19 ausgebildet. Das Antriebselement 14 ist mittels radial innen liegender Umfangswände der Vorsprünge 22 relativ zu dem Abtriebselement 16 drehbar zu diesem angeordnet.The
An einer äußeren Mantelfläche des ersten Seitendeckels 17 ist ein Kettenrad 23 ausgebildet, über das mittels eines nicht dargestellten Kettentriebs Drehmoment von der Kurbelwelle 2 auf das Antriebselement 14 übertragen werden kann. Das Abtriebselement 16 ist drehfest mit der Nockenwelle 6,7 verbunden. Zu diesem Zweck ist in der dargestellten Ausführungsform der Druckmittelverteiler 13 mit einem Gewindeabschnitt 24 versehen, der in einen Gewindeabschnitt 25 der Nockenwelle 6, 7 eingreift. Der Druckmittelverteiler 13 durchgreift eine Zentralöffnung 16a des Abtriebselements 16. Dabei liegt ein Absatz des Druckmittelverteilers 13 an der der Nockenwelle 6, 7 abgewandten Seitenfläche des Abtriebselements 16 an.On an outer lateral surface of the first side cover 17, a
Je einer der Seitendeckel 17, 18 ist an einer der axialen Seitenflächen des Gehäuses 15 angeordnet und drehfest an diesem fixiert. Zu diesem Zweck ist in jedem Vorsprung 22 eine Axialöffnung 26 vorgesehen. Des Weiteren sind in den Seitendeckeln 17, 18 jeweils fünf Öffnungen vorgesehen, die derart angeordnet sind, dass diese mit den Axialöffnungen 26 fluchten. Jeweils eine Schraube 27 durchgreift eine Öffnung des zweiten Seitendeckels 18, eine Axialöffnung 26 und eine Öffnung des ersten Seitendeckels 17. Dabei greift ein Gewindeabschnitt der Schraube 27 in einen Gewindeabschnitt ein, der in der Öffnung des ersten Seitendeckels 17 ausgebildet ist.Depending on one of the side covers 17, 18 is arranged on one of the axial side surfaces of the housing 15 and rotatably fixed thereto. For this purpose, an
Innerhalb der Vorrichtung 11 ist zwischen jeweils zwei in Umfangsrichtung benachbarten Vorsprüngen 22 ein Druckraum 28 ausgebildet. Jeder der Druckräume 28 wird in Umfangsrichtung von gegenüberliegenden, im Wesentlichen radial verlaufenden Begrenzungswänden 29 benachbarter Vorsprünge 22, in axialer Richtung von den Seitendeckeln 17, 18, radial nach innen von dem Nabenelement 19 und radial nach außen von der Umfangswand 21 begrenzt. In jeden der Druckräume 28 ragt ein Flügel 20, wobei die Flügel 20 derart ausgebildet sind, dass diese sowohl an den Seitendeckeln 17, 18, als auch an der Umfangswand 21 anliegen. Jeder Flügel 20 teilt somit den jeweiligen Druckraum 28 in zwei gegeneinander wirkende Druckkammern 30, 31.Within the
Das Abtriebselement 16 ist in einem definierten Winkelbreich drehbar zu dem Antriebselement 14 angeordnet. Der Winkelbereich wird in einer Drehrichtung des Abtriebselements 16 dadurch begrenzt, dass die Flügel 20 an je einer korrespondierenden Begrenzungswand 29 (Frühanschlag 32) der Druckräume 28 zum Anliegen kommen. Analog wird der Winkelbereich in der anderen Drehrichtung dadurch begrenzt, dass die Flügel 20 an den anderen Begrenzungswänden 29 der Druckräume 28, die als Spätanschlag 33 dienen, zum Anliegen kommen.The output element 16 is arranged rotatably in a defined Winkelbreich to the drive element 14. The angular range is limited in one direction of rotation of the driven element 16 in that the
Durch Druckbeaufschlagung einer Gruppe von Druckkammern 30, 31 und Druckentlastung der anderen Gruppe kann die Phasenlage des Antriebselements 14 zum Abtriebselement 16 (und damit die Phasenlage der Nockenwelle 6, 7 zur Kurbelwelle 2) variiert werden. Durch Druckbeaufschlagung beider Gruppen von Druckkammern 30, 31 kann die Phasenlage konstant gehalten werden.By pressurizing a group of
Zur Versorgung der Phasenstelleinrichtung 12 mit Druckmittel ist der Druckmittelverteiler 13 mit einem Steuerventil 34 versehen. Das Steuerventil 34 umfasst ein im Wesentlichen hohlzylindrisch ausgebildetes Ventilgehäuse 35 und einen Steuerkolben 36, der innerhalb des Ventilgehäuses 35 axial verschiebbar angeordnet ist. Das Ventilgehäuse 35 ist mit einem Zulaufanschluss P, einem Ablaufanschluss T, und zwei Arbeitsanschlüssen A, B versehen.To supply the
Der Druckmittelverteiler 13 durchgreift die Zentralöffnung 16a des Abtriebselements 16, wobei dessen nockenwellenzugewandter Abschnitt in einer Aufnahme 37 der hohl ausgebildeten Nockenwelle 6, 7 angeordnet ist. Die Nockenwelle 6, 7 weist im Bereich der Aufnahme 37 mehrere Öffnungen 38 auf, die einerseits mit einem Druckmitteldrehübertrager 39, welcher die Nockenwelle 6, 7 zumindest teilweise umgreift, und andererseits mit dem Inneren der Nockenwelle 6, 7 kommunizieren. In der dargestellten Ausführungsform ist der Druckmitteldrehübertrager 39 gleichzeitig als Nockenwellenlager 50 ausgebildet. Über den Druckmitteldrehübertrager 39 und die Öffnungen 38 wird dem Inneren der Nockenwelle 6, 7 während des Betriebs der Brennkraftmaschine 1 Druckmittel aus deren Schmiermittelkreislauf zugeführt. Denkbar sind auch Ausführungsformen, in denen den Druckmitteldrehübertrager 39 separat zu den Nockenwellenlagern 50 ausgeführt ist und ausschließlich die Druckmittelübergabe zwischen zylinderkopffesten Bauteilen und der Nockenwelle 6, 7 ermöglicht.The
Der Druckmittelverteiler 13 ist derart ausgebildet und angeordnet, dass ein Druckmittelpfad 40 ausgebildet wird, der einerseits mit den Öffnungen 38 und andererseits mit dem Zulaufanschluss P kommuniziert. Der Druckmittelpfad 40 besteht in der dargestellten Ausführungsform aus einem ersten Druckmittelkanal 41 zwischen der Außenmantelfläche des Druckmittelverteilers 13 und der Innenmantelfläche der Nockenwelle 6, 7, der mit Radialöffnungen 42 kommuniziert, die wiederrum mit dem Inneren des Druckmittelverteilers 13 kommunizieren. Von dort gelangt das Druckmittel über ein Rückschlagventil 43 und einen axialen Kanal 44 zu dem Zulaufanschluss P.The
Abhängig von der axialen Stellung des Steuerkolbens 36 zu dem Ventilgehäuse 35, gelangt das Druckmittel entweder zu dem ersten oder zweiten Arbeitsanschluss A, B und von dort über radiale Druckmittelleitungen 45, 46 zu den ersten bzw. zweiten Druckkammern 30, 31. Gleichzeitig wird das Druckmittel aus den anderen Druckkammern 30, 31 über die Druckmittelleitungen 45, 46 zu dem Steuerventil 34 zurückgeführt und über den Ablaufanschluss T ausgesto-βen. Die axiale Stellung des Steuerkolbens 36 relativ zu dem Ventilgehäuse 35 ist mittels einer elektromagnetischen Stelleinheit 47 gezielt einstellbar.Depending on the axial position of the
Im Inneren des Druckmittelverteilers 13 ist ein zweiter Druckmittelkanal 48 vorgesehen, der einerseits über die Radialöffnungen 42 und den ersten Druckmittelkanal 41 mit den Öffnungen 38 und andererseits mit einem Hohlraum 49 der hohl ausgebildeten Nockenwelle 6, 7 kommuniziert. Der zweite Druckmittelkanal 48 ist in den in den
Um eine hohe Ansprechgeschwindigkeit und eine hohe Verstellgeschwindigkeit der Phasenstelleinrichtung 12 zu gewährleisten, ist es erforderlich einen hohen Volumenstrom zu der Phasenstelleinrichtung 12 zu ermöglichen. Gleichzeitig ist es vorteilhaft den Volumenstrom zu den Nockenwellenlagern 50 auf ein deren Funktionsfähigkeit gewährleistendes Minimum zu begrenzen. Dadurch kann der benötigte Volumenstrom, der über den Druckmitteldrehübertrager 39 bereitgestellt werden muss, gesenkt werden, wobei gleichzeige eine hohe Ansprech- und Verstellgeschwindigkeit der Phasenstelleinrichtung 12 gewährleistet wird. Zu diesem Zweck ist innerhalb des zweiten Druckmittelkanals 48 eine Drossel 52 vorgesehen, die den Druckmittelstrom von dem Druckmitteldrehübertrager 39 zu den Lagerflächen der Nockenwellenlagern 50 begrenzt, ohne den Druckmittelstrom zu der Phasenstelleinrichtung 12 zu behindern. In der in
Mittels der Erfindung können eine oder mehrere von dem Druckmitteldrehübertrager 39 separate Nockenwellenlager 50 mit Schmiermittel versorgt werden. Somit können die sonst in dem Zylinderkopf üblichen Strukturen zur Schmiermittelversorgung jedes einzelnen Nockenwellenlagers 50 entfallen, wodurch die Komplexität und die Kosten des Zylinderkopfes gesenkt werden. Durch die Druckmittelversorgung aller Nockenwellenlager 50 über den Hohlraum 49 der Nockenwelle 6, 7 ist nur eine Druckmittelzuführung zu der Nockenwelle 6, 7 notwendig, über die gleichzeitig die Phasenstelleinrichtung 12 versorgt wird. Die Ausbildung des zweiten Druckmittelkanals 48 durch den Druckmittelverteiler 13 verringert die Kosten und die Komplexität der Vorrichtung 11 deutlich. Somit kann die Versorgung der Phasenstelleinrichtung 12 und der Nockenwellenlagern 50 mittels eines einzigen Bauteils realisiert werden, wodurch der Montageaufwand beträchtlich sinkt.By means of the invention, one or more of the pressure medium rotary transformer 39 separate camshaft bearing 50 can be supplied with lubricant. Thus, the usual in the cylinder head structures for supplying lubricant to each individual camshaft bearing 50 can be omitted, whereby the complexity and the cost of the cylinder head can be reduced. By the pressure medium supply of all camshaft bearing 50 via the
- 11
- BrennkraftmaschineInternal combustion engine
- 22
- Kurbelwellecrankshaft
- 33
- Kolbenpiston
- 44
- Zylindercylinder
- 55
- Zugmitteltriebtraction drive
- 66
- Einlassnockenwelleintake camshaft
- 77
- Auslassnockenwelleexhaust
- 88th
- Nockencam
- 99
- EinlassgaswechselventilInlet gas exchange valve
- 1010
- AuslassgaswechselventilAuslassgaswechselventil
- 1111
- Vorrichtungcontraption
- 1212
- PhasenstelleinrichtungPhase adjustment device
- 1313
- DruckmittelverteilerFluid manifold
- 1414
- Antriebselementdriving element
- 1515
- Gehäusecasing
- 1616
- Abtriebselementoutput element
- 16a16a
- Zentralöffnungcentral opening
- 1717
- Seitendeckelside cover
- 1818
- Seitendeckelside cover
- 1919
- Nabenelementhub element
- 2020
- Flügelwing
- 2121
- Umfangswandperipheral wall
- 2222
- Vorsprunghead Start
- 2323
- KettenradSprocket
- 2424
- Gewindeabschnittthreaded portion
- 2525
- Gewindeabschnittthreaded portion
- 2626
- Axialöffnungaxial opening
- 2727
- Schraubescrew
- 2828
- Druckraumpressure chamber
- 2929
- Begrenzungswandboundary wall
- 3030
- erste Druckkammerfirst pressure chamber
- 3131
- zweite Druckkammersecond pressure chamber
- 3232
- Frühanschlagearly stop
- 3333
- Spätanschlaglate stop
- 3434
- Steuerventilcontrol valve
- 3535
- Ventilgehäusevalve housing
- 3636
- Steuerkolbenspool
- 3737
- Aufnahmeadmission
- 3838
- Öffnungenopenings
- 3939
- DruckmitteldrehübertragerPressure medium rotary joint
- 4040
- DruckmittelpfadPressure fluid conduit
- 4141
- erster Druckmittelkanalfirst pressure medium channel
- 4242
- Radialöffnungenradial openings
- 4343
- Rückschlagventilcheck valve
- 4444
- axialer Kanalaxial channel
- 4545
- erste Druckmittelleitungfirst pressure medium line
- 4646
- zweite Druckmittelleitungsecond pressure medium line
- 4747
- Stelleinheitactuator
- 4848
- zweiter Druckmittelkanalsecond pressure medium channel
- 4949
- Hohlraumcavity
- 5050
- Nockenwellenlagercamshaft bearings
- 5151
- radiale Öffnungradial opening
- 5252
- Drosselthrottle
- 5353
- Längsnutlongitudinal groove
- 5454
- Filterelementfilter element
- AA
- erster Arbeitsanschlussfirst work connection
- BB
- zweiter Arbeitsanschlusssecond work connection
- PP
- Zulaufanschluss T AblaufanschlussInlet connection T Drain connection
Claims (14)
- Device (11) for the variable adjustment of the timing of gas exchange valves (9, 10) of an internal combustion engine (1) having- a hydraulic phase shifting device (12), a camshaft (6, 7), and a pressurizing means distributor (13),- the phase shifting device (12) being able to be brought into a drive connection with a crankshaft (2) and being connected in a rotationally-fixed manner to the camshaft (6, 7),- a phase location of the camshaft (6, 7) relative to the crankshaft (2) being variably adjustable using the phase shifting device (12),- the interior of the camshaft (6, 7) having a cavity (49), which communicates with one or more camshaft bearings (50), which are formed separately from a rotating pressurizing means conveyor (39),- the pressurizing means distributor (13) being situated in a receptacle area (37) of the camshaft (6, 7),- the camshaft (6, 7) having an opening (38) in the area of the pressurizing means distributor (13), which communicates on one side with the interior of the camshaft (6, 7) and on the other side with the rotating pressurizing means conveyor (39),- a pressurizing means path (40) being formed inside the camshaft (6, 7), which communicates on one side with the opening (38) and on the other side with the hydraulic phase shifting device (12),- characterized in that a second pressurizing means duct (48) is provided, which communicates on one side with the opening (38) and on the other side with the cavity (49),- the second pressurizing means duct (48) being at least partially formed by the pressurizing means distributor (13).
- Device (11) according to Claim 1, characterized in that the pressurizing means distributor (13) is provided with a threaded section (24), by means of which the phase shifting device (12) is fastenable on the camshaft (6, 7).
- Device (11) according to Claim 1, characterized in that the pressurizing means distributor (13) has a control valve (34), by means of which the phase shifting device (12) can be supplied with pressurizing means.
- Device (11) according to Claim 1, characterized in that the pressurizing means distributor (13) penetrates a central opening (16a) of the phase shifting device (12).
- Device (11) according to Claim 1, characterized in that a minimal passage surface of the second pressurizing means duct (48) is designed as smaller than a minimal passage surface of the pressurizing means path (40) between the opening (38) and the phase shifting device (12).
- Device (11) according to Claim 1, characterized in that the second pressurizing means duct (48) is formed inside the pressurizing means distributor (13).
- Device (11) according to Claim 1, characterized in that the second pressurizing means duct (48) is formed on an interface between the cavity (49) and the pressurizing means distributor (13).
- Device (11) according to Claim 7, characterized in that the second pressurizing means duct (48) is formed as a longitudinal groove (53) on an outer lateral surface of the pressurizing means distributor (13).
- Device (11) according to Claim 7, characterized in that the second pressurizing means duct (48) is formed as a longitudinal groove (53) on an inner lateral surface of the camshaft (6, 7) in the area of the pressurizing means distributor (13).
- Device (11) according to Claim 1, characterized in that the second pressurizing means duct (48) has a throttle (52).
- Device (11) according to Claim 10, characterized in that the throttle (52) is formed using a separate component, which is situated in the second pressurizing means duct (48).
- Device (11) according to Claim 1, characterized in that the rotating pressurizing means conveyor (39) is designed as a camshaft bearing (50).
- Device (11) according to Claim 1, characterized in that the pressurizing means path (40) is at least partially formed by the pressurizing means distributor (13).
- Device (11) according to Claim 1, characterized in that a filter element (54) is situated in the second pressurizing means duct (48).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102008036182A DE102008036182A1 (en) | 2008-08-02 | 2008-08-02 | Device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine |
PCT/EP2009/059668 WO2010015541A1 (en) | 2008-08-02 | 2009-07-27 | Device for variable adjustment of the timing of gas exchange valves of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2321501A1 EP2321501A1 (en) | 2011-05-18 |
EP2321501B1 true EP2321501B1 (en) | 2012-01-25 |
Family
ID=41058944
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09781129A Not-in-force EP2321501B1 (en) | 2008-08-02 | 2009-07-27 | Device for variable adjustment of the timing of gas exchange valves of an internal combustion engine |
Country Status (6)
Country | Link |
---|---|
US (1) | US20110132303A1 (en) |
EP (1) | EP2321501B1 (en) |
CN (1) | CN102112707B (en) |
AT (1) | ATE542984T1 (en) |
DE (1) | DE102008036182A1 (en) |
WO (1) | WO2010015541A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012201551B4 (en) | 2012-02-02 | 2022-05-12 | Schaeffler Technologies AG & Co. KG | Camshaft adjuster and method for filling a volume accumulator in a camshaft adjuster |
DE102012201573A1 (en) | 2012-02-02 | 2013-08-08 | Schaeffler Technologies AG & Co. KG | Phaser |
DE102012204617A1 (en) | 2012-03-22 | 2013-09-26 | Schaeffler Technologies AG & Co. KG | Control valve of camshaft adjuster used in internal combustion engine, has control piston which is secured against rotation to housing so that partial control edge at outer periphery cooperates with opening of housing |
DE102012210178B4 (en) | 2012-06-18 | 2016-05-19 | Schaeffler Technologies AG & Co. KG | Control valve of a camshaft adjuster |
DE102012218802B4 (en) | 2012-10-16 | 2018-05-17 | Schaeffler Technologies AG & Co. KG | Control valve for a camshaft adjuster system |
DE102012221876B4 (en) * | 2012-11-29 | 2021-01-07 | Schaeffler Technologies AG & Co. KG | Camshaft adjustment device |
DE102013104573B4 (en) * | 2013-05-03 | 2018-05-17 | Hilite Germany Gmbh | Hydraulic valve and Schwenkmotorversteller |
KR101470208B1 (en) * | 2013-09-04 | 2014-12-05 | 현대자동차주식회사 | Oil supply device |
DE102014102617A1 (en) * | 2014-02-27 | 2015-08-27 | Hilite Germany Gmbh | Hydraulic valve for a Schwenkmotorversteller a camshaft |
DE102014204566B4 (en) * | 2014-03-12 | 2021-05-12 | Schaeffler Technologies AG & Co. KG | Central valve for a camshaft adjuster with central locking |
DE102014115903B4 (en) * | 2014-10-31 | 2020-07-30 | Hilite Germany Gmbh | Hydraulic valve and swivel motor adjuster |
DE102016214503B4 (en) | 2015-10-28 | 2022-03-10 | Schaeffler Technologies AG & Co. KG | camshaft adjustment device |
DE102018102206A1 (en) | 2018-02-01 | 2019-08-01 | ECO Holding 1 GmbH | Adjustable hydraulic unit |
DE102021207428A1 (en) | 2021-07-13 | 2023-01-19 | Mahle International Gmbh | Camshaft module for an internal combustion engine |
DE102021207429A1 (en) | 2021-07-13 | 2023-01-19 | Mahle International Gmbh | Camshaft module for an internal combustion engine |
DE102022109290A1 (en) | 2022-04-14 | 2023-10-19 | Bayerische Motoren Werke Aktiengesellschaft | Internal combustion engine for a motor vehicle, in particular for a motor vehicle, and motor vehicle |
DE102022109289A1 (en) | 2022-04-14 | 2023-10-19 | Bayerische Motoren Werke Aktiengesellschaft | Internal combustion engine for a motor vehicle, in particular for a motor vehicle, and motor vehicle |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2760619B2 (en) * | 1990-01-30 | 1998-06-04 | 株式会社ユニシアジェックス | Valve timing control device for internal combustion engine |
SK16982000A3 (en) * | 1998-05-12 | 2001-04-09 | Trochocentric International Ag | Device for adjusting the phase position of a shaft |
DE19944535C1 (en) * | 1999-09-17 | 2001-01-04 | Daimler Chrysler Ag | Cam shaft adjuster for internal combustion engines has control slider with central return bore and controllable housing connections connectable to supply connection on return side |
US7017952B2 (en) * | 2002-06-21 | 2006-03-28 | Maclean-Fogg Company | Fluid connector |
US6799544B1 (en) * | 2003-05-29 | 2004-10-05 | Delphi Technologies, Inc. | Method and apparatus for actuating a cam phaser |
DE10346443A1 (en) * | 2003-10-07 | 2005-05-04 | Daimler Chrysler Ag | Hydraulic camshaft adjuster for internal combustion engine, has electromagnetic operating unit for operating hydraulic control valve having valve housing with control piston for controlling supply of hydraulic fluid |
US7140335B2 (en) * | 2004-09-17 | 2006-11-28 | Kaymor, Llc | Dynamic valve timing adjustment mechanism for internal combustion engines |
DE102005034276A1 (en) * | 2005-07-22 | 2007-01-25 | Daimlerchrysler Ag | Camshaft adjusting device |
DE102005052481A1 (en) | 2005-11-03 | 2007-05-24 | Schaeffler Kg | Control valve for a device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine |
DE102005060111A1 (en) * | 2005-12-16 | 2007-07-05 | Schaeffler Kg | Camshaft adjuster feed line |
-
2008
- 2008-08-02 DE DE102008036182A patent/DE102008036182A1/en not_active Withdrawn
-
2009
- 2009-07-27 WO PCT/EP2009/059668 patent/WO2010015541A1/en active Application Filing
- 2009-07-27 AT AT09781129T patent/ATE542984T1/en active
- 2009-07-27 US US13/057,070 patent/US20110132303A1/en not_active Abandoned
- 2009-07-27 EP EP09781129A patent/EP2321501B1/en not_active Not-in-force
- 2009-07-27 CN CN200980130741.9A patent/CN102112707B/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
CN102112707B (en) | 2013-09-18 |
DE102008036182A1 (en) | 2010-02-04 |
ATE542984T1 (en) | 2012-02-15 |
US20110132303A1 (en) | 2011-06-09 |
WO2010015541A1 (en) | 2010-02-11 |
CN102112707A (en) | 2011-06-29 |
EP2321501A1 (en) | 2011-05-18 |
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