EP2536925A1 - Device for variable adjustment of the control times of gas exchange valves of an internal combustion engine - Google Patents

Device for variable adjustment of the control times of gas exchange valves of an internal combustion engine

Info

Publication number
EP2536925A1
EP2536925A1 EP11701237A EP11701237A EP2536925A1 EP 2536925 A1 EP2536925 A1 EP 2536925A1 EP 11701237 A EP11701237 A EP 11701237A EP 11701237 A EP11701237 A EP 11701237A EP 2536925 A1 EP2536925 A1 EP 2536925A1
Authority
EP
European Patent Office
Prior art keywords
camshaft
fastening element
pressure medium
central screw
adjusting device
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.)
Granted
Application number
EP11701237A
Other languages
German (de)
French (fr)
Other versions
EP2536925B1 (en
Inventor
Mathias BÖGERSHAUSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2536925A1 publication Critical patent/EP2536925A1/en
Application granted granted Critical
Publication of EP2536925B1 publication Critical patent/EP2536925B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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
    • F01L2001/34446—Fluid accumulators for the feeding circuit

Definitions

  • the invention relates to a device for variably adjusting the timing of gas exchange valves of an internal combustion engine having a hydraulic phase adjusting device, a camshaft, a volume accumulator, a separately formed to the camshaft fastener and a central screw, the central screw passes through the phase adjusting device and wherein one end of the Central screw rests against an axial side surface of the phase adjusting device and at the other end a first thread is formed.
  • the device In modern internal combustion engines devices for variable adjustment of the timing of gas exchange valves are used to adjust the phase relation between the crankshaft and camshaft in a defined angular range, between a maximum early and a maximum late position, vari- abel.
  • the 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.
  • the device has a phase adjusting device and a central screw, by means of which the phase adjusting device is connected in a rotationally fixed manner to the camshaft.
  • the phase adjusting device can be designed, for example, as a vane-type pivoting motor with a plurality of pressure chambers acting against one another.
  • the phase relation of the impeller relative to the cellular wheel and thus the camshaft relative to the crankshaft can be variably adjusted.
  • the pressure medium flow to and from the pressure chambers is usually controlled by means of a hydraulic way proportional valve, which can be accommodated, for example, within the central screw.
  • Such a device is known for example from DE 10 2005 060 1 1 1 A1.
  • the central screw is screwed to a solid camshaft to realize the rotationally fixed connection between the phase-adjusting device and the camshaft.
  • a further device is known.
  • the phasing means is mounted on a built camshaft consisting of a tube and cam mounted thereon.
  • the phase adjusting device by means of a welded connection rotatably mounted on the camshaft.
  • a cavity is provided within the solid camshaft, which serves as a volume storage.
  • the volume reservoir fills with pressure medium. If the pressure medium requirement of the phase adjusting device rises above the volume flow provided by the pressure medium pump, the volume memory supports the phase adjusting device.
  • the present invention has for its object to provide a device with high response and low production cost.
  • the interior of the camshaft has a cavity in which the fastener is received stationary, wherein on the fastener, a second thread is formed, which cooperates with the first thread of the central screw such that a rotationally fixed connection between the Device and the camshaft is produced and wherein in the cavity a volume accumulator is arranged with a housing, wherein an axial end of the housing rests against a contact surface of the fastening element.
  • the device has a hydraulic phase adjusting device, a camshaft, a central screw and a first fastening element.
  • the phase adjusting device is in drive connection with a crankshaft and is rotatably connected by means of the central screw with the camshaft.
  • the central screw passes through the phase adjusting device wherein one end of the central screw, for example, a collar, rests against an axial side surface of the phase adjusting device and at the other end a first thread, usually an external thread is formed.
  • the camshaft has a cavity in which the fastening element, which is manufactured separately from the camshaft, is received in a stationary manner, ie immovably in the axial direction and in the circumferential direction under normal load.
  • the fastening element can for example be screwed to the lateral surface of the cavity. Also conceivable is a frictional connection.
  • the fastening element has a second thread, usually an internal thread into which the central screw is screwed, so that the phase-in direction rotatably connected to the camshaft.
  • the device has a volume accumulator which is arranged in the camshaft. The volume accumulator is filled with pressure medium in phases in which sufficient pressure medium is available for operating the phase adjusting device.
  • the volume memory has a housing in which the pressure medium can be stored.
  • a displaceable, spring-loaded piston, a flexible membrane or a gas-filled bubble can be arranged, which serve as energy storage. It is provided that an axial end of the housing bears against a contact surface, as a rule an axial side surface, of the fastening element.
  • the housing may be connected to the fastening element.
  • the fastening element thus serves, on the one hand, for producing the non-rotatable connection between the phase-adjusting device and the camshaft by means of the central screw, wherein this connection method can also be used with relatively thin-walled, built-in camshafts due to the use of the fastening element. Furthermore, the fastening element serves for the axial positional fixing of the housing of the volume accumulator.
  • the fastening element is first positioned and fixed in the cavity of the camshaft. Subsequently, the phase adjusting device by means of the central screw rotatably connected to the camshaft and introduced the volume storage in the camshaft of the phase adjuster end facing away. Subsequently, this end of the camshaft is closed with a second fastening element, wherein the second fastening element urges the volume accumulator against the first fastening element, so that the volume accumulator is fixed in the axial direction.
  • the contact surface in the direction of the housing conical.
  • the housing of the volume accumulator undergoes during assembly of the second fastening element. Centering so that the housing is automatically aligned coaxially to the axis of rotation of the camshaft.
  • a conical contact surface is advantageously also provided on the second fastening element. The centering of the housing in the cavity of the camshaft results in an annular gap between the housing and the lateral surface of the cavity, which can be used for supplying lubricant to camshaft bearing points.
  • the first fastening element or the central screw has a pressure medium channel extending in the axial direction, which opens into the cavity, for example the annular gap, on the side of the fastening element facing away from the phase adjusting device.
  • the pressure medium channel can be formed for example as a bore within the central screw or on an outer circumferential surface of the fastening element.
  • the pressure medium channel communicates with the volume accumulator or with a camshaft bearing point.
  • the fastener assumes not only the functionalities of attaching the phase adjusting device with the camshaft and the volume accumulator with the camshaft, but realized in a simple, cost-neutral manner also parts of the pressure medium supply within the device and adjacent assemblies. This considerably reduces the number of components required and the complexity of the device.
  • Figure 1 only very schematically an internal combustion engine Figure 2 is a longitudinal section through a device according to the invention
  • Figure 4 perspective view of a fastener.
  • FIG. 1 shows 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 1 1 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.
  • FIG. 2 shows a first embodiment of a device according to the invention 1 1 in the longitudinal or in the cross section.
  • the device 11 has a phase adjusting device 12, a camshaft 6, 7, a central screw 13 and a first fastening element 14.
  • the phase adjusting device 12 is designed as a hydraulic actuator, which is offset by means of a Glasstoff- or gear wheel drive 5 of the crankshaft 2 in rotation and rotationally fixed to the camshaft 6, 7 is connected.
  • pressure medium supply to a group of pressure chambers, not shown, of the hydraulic actuator of the phase adjusting device 12 at the same pressure medium outflow of a second group of pressure chambers, also not shown, the phase angle of the camshaft 6, 7 can be variably adjusted relative to the crankshaft 2 in a defined angular interval.
  • Such phase adjusting devices 12 are known in the art and disclosed for example in DE 42 18 082 A1 or DE 10 2005 060 1 1 1 A1.
  • the phase adjusting device 12 is arranged at one axial end of the camshaft 6, 7 and is located in the axial direction on an axial stop formed on the camshaft 6, 7.
  • the phase adjusting device 12 is rotatably connected to the camshaft 6, 7.
  • the central screw 13 passes through the phase adjusting device 12, wherein one end of the central screw 13 is formed with a radially extending collar. The collar abuts on one of the camshaft 6, 7 facing away from side surface of the phase adjusting device 12.
  • a first thread 15 is formed at the other end of the central screw 13, a first thread 15 is formed.
  • the camshaft 6, 7 is formed as a hollow shaft and has a cavity 16 which extends along the entire camshaft 6, 7.
  • the first fastener 14 is disposed and fixed in place, i. in the axial and radial directions immovably fixed to the camshaft 6, 7. In the illustrated embodiment, this is realized by means of a press fit between an outer circumferential surface of the first fastening element 14 and a lateral surface 16 a of the cavity 16.
  • the first fastening element 14 has, in a central through-bore, a second thread 17 into which the first thread 15 of the central screw 13 engages, so that the phase-adjusting device 12 is non-rotatably connected to the camshaft 6, 7.
  • the volume accumulator 18 has a housing 19, a separating element 20, which is designed as a piston 20, and a spring element 21.
  • the housing 19 is substantially hollow cylindrical, each having an opening 22 formed on each axial end face, wherein the housing 19 at its axial ends 23 extends radially inwardly.
  • the outer diameter of the housing 19 is formed smaller than the diameter of the cavity 16.
  • the piston 20 is formed as a thin-walled, cup-shaped sheet metal component and mounted axially displaceable within the housing 19. In this case, the piston 20 separates the interior of the housing 19 into a storage space 24 and a complementary space 25.
  • the spring element 21 is arranged in the complementary space 25 and is supported on the one hand on the side facing away from the reservoir 24 of the piston 20 and on the other hand on the radially inwardly extending portion of the housing 19 from.
  • the axial ends 23 of the housing 19 in each case abut against a conical contact surface 26 (FIGS. 2 and 3).
  • the first conical contact surface 26 is formed on the side facing away from the phase adjusting device 12 side of the first fastening element 14 as an inner cone.
  • the second contact surface 26 is formed on a second fastening element 27 which is fixedly connected to the camshaft 6, 7 and arranged at the end of the camshaft 6, 7 facing away from the phase adjusting device 12.
  • the second contact surface 26 is designed as an outer cone.
  • the volume accumulator 18 is fixed by the abutment of the housing 19 on the conical contact surfaces 26 in the cavity 16 in the axial direction and centered to the longitudinal axis of the camshaft 6, 7.
  • annular gap 28 is realized between the housing 19 and the lateral surface 16a.
  • the annular gap 28 extends from the first fastening element 14 along the entire camshaft 6, 7 and covers in particular a plurality of camshaft bearing points 29.
  • the annular gap 28 is sealed by the second fastening element 27 in the axial direction.
  • the first fastening element 14 has on its outer lateral surface first pressure medium channels 31 in the form of grooves extending in the axial direction (FIG. 4), so that the annular gap 28 communicates with a receiving region 13a of the cavity 16, in which the central screw 13 is arranged.
  • pressure medium which is conveyed by a pressure medium pump, not shown, via bores 30, which are formed in the region of the first camshaft bearing point 29a on the camshaft 6, 7, the receiving portion 13a. Via the first pressure medium channels 31, the annular gap 28 and the bores 30, the pressure medium reaches the camshaft bearing points 29.
  • the second fastening element 27 prevents the escape of pressure medium at the side of the camshaft 6, 7 facing away from the phase adjusting device 12.
  • the pressure medium passes through screw openings 32 into the interior of the hollow central screw 13.
  • the pressure medium reaches the phase adjustment device 12 via a hydraulic directional proportional valve, not shown, arranged on the inside of the central screw 13.
  • a hydraulic directional proportional valve not shown, arranged on the inside of the central screw 13.
  • Such proportional directional valves are known for example from DE 10 2005 052 481 A1.
  • excess pressure medium passes through a second pressure medium channel 33 formed in the central screw 13 to the reservoir-side opening 22 of the housing 19 of the volume accumulator 18 and is supplied to the reservoir 24.
  • the piston 20 is displaced against the force of the spring element 21, as a result of which the volume of the storage space 24 is at the expense of volume. mens of Complementary Brown 25 increases.
  • the piston 20 is displaced in the opposite direction due to the force exerted by the spring element 21 and thus the pressure medium stored in the volume memory 18 is transferred via the second pressure medium channel 33 of the phase adjusting device 12 is supplied.
  • the second fastening element 27 has an axially extending, central passage opening 34, via which the complementary space 25 communicates with the interior of the internal combustion engine 1. Thus, air and pressure medium escape from the complementary space 25.

Abstract

The invention relates to a device (11) for variable adjustment of the control times of gas change valves (9, 10) of an internal combustion engine (1) having a hydraulic phase adjustment apparatus (12), a camshaft (6, 7), a volume accumulator (18), a first fastening element (14) designed separately to the camshaft (6, 7) and a central screw (13), wherein the central screw (13) reaches through the phase adjustment apparatus (12) and wherein one end of the central screw (13) contacts an axial side surface of the phase adjustment apparatus (12) and a first thread (15) is designed on the other end.

Description

Bezeichnung der Erfindung  Name of the invention
Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine Device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine
Beschreibung Gebiet der Erfindung Die Erfindung betrifft eine Vorrichtung zur variablen Einstellung der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine mit einer hydraulischen Phasenstelleinrichtung, einer Nockenwelle, einem Volumenspeicher, einem separat zur Nockenwelle ausgebildeten Befestigungselement und einer Zentralschraube, wobei die Zentralschraube die Phasenstelleinrichtung durchgreift und wobei ein Ende der Zentralschraube an einer axialen Seitenfläche der Phasenstelleinrichtung anliegt und an dem anderen Ende ein erstes Gewinde ausgebildet ist. The invention relates to a device for variably adjusting the timing of gas exchange valves of an internal combustion engine having a hydraulic phase adjusting device, a camshaft, a volume accumulator, a separately formed to the camshaft fastener and a central screw, the central screw passes through the phase adjusting device and wherein one end of the Central screw rests against an axial side surface of the phase adjusting device and at the other end a first thread is formed.
Hintergrund der Erfindung Background of the invention
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, vari- abel einstellen zu können. Die Vorrichtung ist 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. Die Vorrichtung weist neben der Nockenwelle eine Phasenstelleinrichtung und eine Zentralschraube auf, mittels derer die Pha- senstelleinrichtung drehfest mit der Nockenwelle verbunden ist. Die Phasenstelleinrichtung kann beispielsweise als Schwenkmotor in Flügelzellenbauweise mit mehreren gegeneinander wirkenden Druckkammern ausgebildet sein. Durch Druckmittelzufuhr zu einer Gruppe von Druckkammern bei gleichzeiti- gern Abfluss von Druckmittel aus der anderen Gruppe von Druckkammern kann die Phasenrelation des Flügelrades relativ zu dem Zellenrad und damit der Nockenwelle relativ zur Kurbelwelle variabel eingestellt werden. Der Druckmit- telfluss zu und von den Druckkammern wird üblicherweise mittels eines hydrau- lischen Wegeproportionalventils geregelt, welches beispielsweise innerhalb der Zentralschraube aufgenommen sein kann. In modern internal combustion engines devices for variable adjustment of the timing of gas exchange valves are used to adjust the phase relation between the crankshaft and camshaft in a defined angular range, between a maximum early and a maximum late position, vari- abel. The 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. In addition to the camshaft, the device has a phase adjusting device and a central screw, by means of which the phase adjusting device is connected in a rotationally fixed manner to the camshaft. The phase adjusting device can be designed, for example, as a vane-type pivoting motor with a plurality of pressure chambers acting against one another. By supplying pressure to a group of pressure chambers at the same time like outflow of pressure medium from the other group of pressure chambers, the phase relation of the impeller relative to the cellular wheel and thus the camshaft relative to the crankshaft can be variably adjusted. The pressure medium flow to and from the pressure chambers is usually controlled by means of a hydraulic way proportional valve, which can be accommodated, for example, within the central screw.
Eine derartige Vorrichtung ist beispielsweise aus der DE 10 2005 060 1 1 1 A1 bekannt. In dieser Ausführungsform ist die Zentralschraube mit einer massiv ausgebildeten Nockenwelle verschraubt, um die drehfeste Verbindung zwischen der Phasenstelleinrichtung und der Nockenwelle zu realisieren. Such a device is known for example from DE 10 2005 060 1 1 1 A1. In this embodiment, the central screw is screwed to a solid camshaft to realize the rotationally fixed connection between the phase-adjusting device and the camshaft.
Aus der DE 10 2004 026 863 A1 ist eine weitere Vorrichtung bekannt. In dieser Ausführungsform ist die Phasenstelleinrichtung an einer gebauten Nockenwelle befestigt, die aus einem Rohr und daran befestigten Nocken besteht. In dieser Ausführungsform ist die Befestigung der Phasenstelleinrichtung an der Nockenwelle, auf Grund der als Hohlwelle ausgebildeten Nockenwelle, nur schwer zu realisieren. Aus diesem Grund ist die Phasenstelleinrichtung mittels einer Schweißverbindung drehfest an der Nockenwelle befestigt. From DE 10 2004 026 863 A1 a further device is known. In this embodiment, the phasing means is mounted on a built camshaft consisting of a tube and cam mounted thereon. In this embodiment, the attachment of the phase adjusting device to the camshaft, due to the camshaft designed as a hollow shaft, difficult to realize. For this reason, the phase adjusting device by means of a welded connection rotatably mounted on the camshaft.
Eine weitere Vorrichtung ist aus der DE 102 28 354 A1 bekannt. In dieser Ausführungsform ist innerhalb der massiv ausgebildeten Nockenwelle ein Hohlraum vorgesehen, der als Volumenspeicher dient. In Betriebsphasen der Brennkraftmaschine, in denen von einer Druckmittelpumpe der Brennkraftma- schine ausreichend Druckmittel zum Betrieb der Phasenstelleinrichtung zur Verfügung gestellt wird, füllt sich der Volumenspeicher mit Druckmittel. Steigt der Druckmittelbedarf der Phasenstelleinrichtung über den von der Druckmittelpumpe bereitgestellten Volumenstrom, unterstützt der Volumenspeicher die Phasenstelleinrichtung. Aufgabe der Erfindung Another device is known from DE 102 28 354 A1. In this embodiment, a cavity is provided within the solid camshaft, which serves as a volume storage. In operating phases of the internal combustion engine in which sufficient pressure medium for operating the phase adjusting device is made available by a pressure medium pump of the internal combustion engine, the volume reservoir fills with pressure medium. If the pressure medium requirement of the phase adjusting device rises above the volume flow provided by the pressure medium pump, the volume memory supports the phase adjusting device. Object of the invention
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung mit hohem Ansprechverhalten und geringem Herstellungsaufwand vorzuschlagen. The present invention has for its object to provide a device with high response and low production cost.
Zusammenfassung der Erfindung Summary of the invention
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Innere der Nockenwelle einen Hohlraum aufweist, in dem das Befestigungselement ortsfest aufgenommen ist, wobei an dem Befestigungselement ein zweites Gewinde ausgebildet ist, das mit dem ersten Gewinde der Zentralschraube derart zusammenwirkt, dass eine drehfeste Verbindung zwischen der Vorrichtung und der Nockenwelle hergestellt wird und wobei in dem Hohlraum ein Volumenspeicher mit einem Gehäuse angeordnet ist, wobei ein axiales Ende des Ge- häuses an einer Anlagefläche des Befestigungselements anliegt. The object is achieved in that the interior of the camshaft has a cavity in which the fastener is received stationary, wherein on the fastener, a second thread is formed, which cooperates with the first thread of the central screw such that a rotationally fixed connection between the Device and the camshaft is produced and wherein in the cavity a volume accumulator is arranged with a housing, wherein an axial end of the housing rests against a contact surface of the fastening element.
Die Vorrichtung weist eine hydraulische Phasenstelleinrichtung, eine Nockenwelle, eine Zentralschraube und ein erstes Befestigungselement auf. Die Phasenstelleinrichtung steht in Antriebsverbindung mit einer Kurbelwelle und ist mittels der Zentralschraube drehfest mit der Nockenwelle verbunden. Zu diesem Zweck durchgreift die Zentralschraube die Phasenstelleinrichtung wobei ein Ende der Zentralschraube, beispielsweise ein Bund, an einer axialen Seitenfläche der Phasenstelleinrichtung anliegt und an dem anderen Ende ein erstes Gewinde, in der Regel ein Außengewinde, ausgebildet ist. Durch Druckmittelbeaufschlagung der Phasenstelleinrichtung kann eine Phase der Nockenwelle relativ zu der Kurbelwelle variabel eingestellt werden. Die Nockenwelle weist einen Hohlraum auf, in dem das separat zur Nockenwelle gefertigte Befestigungselement ortsfest, d.h. in axialer Richtung und in Umfangs- richtung bei normaler Belastung unverschiebbar, aufgenommen ist. Das Befes- tigungselement kann beispielsweise mit der Mantelfläche des Hohlraums verschraubt sein. Ebenfalls denkbar ist eine kraftschlüssige Verbindung. Das Befestigungselement weist ein zweites Gewinde, in der Regel ein Innengewinde auf, in das die Zentralschraube eingeschraubt ist, so dass die Phasenstellein- richtung drehfest mit der Nockenwelle verbunden ist. Darüber hinaus weist die Vorrichtung einen Volumenspeicher auf, der in der Nockenwelle angeordnet ist. Der Volumenspeicher wird in Phasen, in denen ausreichend Druckmittel zum Betrieb der Phasenstelleinrichtung zur Verfügung steht, mit Druckmittel befüllt. In Phasen der Druckmittelmangelversorgung der Phasenstelleinrichtung wird das in dem Volumenspeicher gespeicherte Druckmittel zur Verfügung gestellt. Der Volumenspeicher weist ein Gehäuse auf, in dem das Druckmittel gespeichert werden kann. Im Inneren des Gehäuses kann beispielsweise ein verschiebbarer, federbeaufschlagter Kolben, eine flexible Membran oder eine mit Gas gefüllte Blase angeordnet sein, die als Kraftspeicher dienen. Dabei ist vorgesehen, dass ein axiales Ende des Gehäuses an einer Anlagefläche, in der Regel einer axialen Seitenfläche, des Befestigungselements anliegt. Zusätzlich kann das Gehäuse mit dem Befestigungselement verbunden sein. Das Befestigungselement dient somit zum einen zur Herstellung der drehfesten Verbindung zwischen der Phasenstelleinrichtung und der Nockenwelle mittels der Zentralschraube, wobei durch den Einsatz des Befestigungselements diese Verbindungsmethode auch bei relativ dünnwandigen, gebauten Nockenwellen Einsatz finden kann. Des Weiteren dient das Befestigungselement der axialen Lagefixierung des Gehäuses des Volumenspeichers. The device has a hydraulic phase adjusting device, a camshaft, a central screw and a first fastening element. The phase adjusting device is in drive connection with a crankshaft and is rotatably connected by means of the central screw with the camshaft. For this purpose, the central screw passes through the phase adjusting device wherein one end of the central screw, for example, a collar, rests against an axial side surface of the phase adjusting device and at the other end a first thread, usually an external thread is formed. By pressurizing the phase adjusting device, a phase of the camshaft relative to the crankshaft can be variably adjusted. The camshaft has a cavity in which the fastening element, which is manufactured separately from the camshaft, is received in a stationary manner, ie immovably in the axial direction and in the circumferential direction under normal load. The fastening element can for example be screwed to the lateral surface of the cavity. Also conceivable is a frictional connection. The fastening element has a second thread, usually an internal thread into which the central screw is screwed, so that the phase-in direction rotatably connected to the camshaft. In addition, the device has a volume accumulator which is arranged in the camshaft. The volume accumulator is filled with pressure medium in phases in which sufficient pressure medium is available for operating the phase adjusting device. In phases of the pressure medium shortage supply of the phase adjusting device, the pressure medium stored in the volume accumulator is made available. The volume memory has a housing in which the pressure medium can be stored. In the interior of the housing, for example, a displaceable, spring-loaded piston, a flexible membrane or a gas-filled bubble can be arranged, which serve as energy storage. It is provided that an axial end of the housing bears against a contact surface, as a rule an axial side surface, of the fastening element. In addition, the housing may be connected to the fastening element. The fastening element thus serves, on the one hand, for producing the non-rotatable connection between the phase-adjusting device and the camshaft by means of the central screw, wherein this connection method can also be used with relatively thin-walled, built-in camshafts due to the use of the fastening element. Furthermore, the fastening element serves for the axial positional fixing of the housing of the volume accumulator.
Während der Montage der Vorrichtung wird zunächst das Befestigungselement in dem Hohlraum der Nockenwelle positioniert und fixiert. Anschließend wird die Phasenstelleinrichtung mittels der Zentralschraube drehfest mit der Nockenwelle verbunden und der Volumenspeicher in die Nockenwelle von dem der Phasenstelleinrichtung abgewandten Ende eingeführt. Anschließend wird dieses Ende der Nockenwelle mit einem zweiten Befestigungselement verschlossen, wobei das zweite Befestigungselement den Volumenspeicher gegen das erste Befestigungselement drängt, so dass der Volumenspeicher in axialer Richtung fixiert wird. During assembly of the device, the fastening element is first positioned and fixed in the cavity of the camshaft. Subsequently, the phase adjusting device by means of the central screw rotatably connected to the camshaft and introduced the volume storage in the camshaft of the phase adjuster end facing away. Subsequently, this end of the camshaft is closed with a second fastening element, wherein the second fastening element urges the volume accumulator against the first fastening element, so that the volume accumulator is fixed in the axial direction.
In einer Weiterbildung der Erfindung wird vorgeschlagen die Anlagefläche in Richtung des Gehäuses konisch auszubilden. Dadurch erfährt das Gehäuse des Volumenspeichers während der Montage des zweiten Befestigungsele- ments eine Zentrierung, so dass das Gehäuse automatisch koaxial zur Drehachse der Nockenwelle ausgerichtet wird. Zu diesem Zweck ist an dem zweiten Befestigungselement vorteilhafterweise ebenfalls eine konische Anlagefläche vorgesehen. Durch die Zentrierung des Gehäuses in dem Hohlraum der No- ckenwelle entsteht ein Ringspalt zwischen dem Gehäuse und der Mantelfläche des Hohlraums, der zur Schmiermittelversorgung von Nockenwellenlagerstel- len genutzt werden kann. In one embodiment of the invention, it is proposed to form the contact surface in the direction of the housing conical. As a result, the housing of the volume accumulator undergoes during assembly of the second fastening element. Centering so that the housing is automatically aligned coaxially to the axis of rotation of the camshaft. For this purpose, a conical contact surface is advantageously also provided on the second fastening element. The centering of the housing in the cavity of the camshaft results in an annular gap between the housing and the lateral surface of the cavity, which can be used for supplying lubricant to camshaft bearing points.
Darüber hinaus kann vorgesehen sein, dass das erste Befestigungselement oder die Zentralschraube einen in axialer Richtung verlaufenden Druckmittelkanal aufweist, der auf der der Phasenstelleinrichtung abgewandten Seite des Befestigungselements in den Hohlraum, beispielsweise den Ringspalt, mündet. Dabei kann der Druckmittelkanal beispielsweise als Bohrung innerhalb der Zentralschraube oder an einer Außenmantelfläche des Befestigungselements ausgebildet sein. Darüber hinaus kann vorgesehen sein, dass der Druckmittelkanal mit dem Volumenspeicher oder mit einer Nockenwellenlagerstelle kommuniziert. In addition, it may be provided that the first fastening element or the central screw has a pressure medium channel extending in the axial direction, which opens into the cavity, for example the annular gap, on the side of the fastening element facing away from the phase adjusting device. In this case, the pressure medium channel can be formed for example as a bore within the central screw or on an outer circumferential surface of the fastening element. In addition, it may be provided that the pressure medium channel communicates with the volume accumulator or with a camshaft bearing point.
Somit übernimmt das Befestigungselement nicht nur die Funktionalitäten der Befestigung der Phasenstelleinrichtung mit der Nockenwelle und des Volumenspeichers mit der Nockenwelle, sondern realisiert auf einfache, kostenneutrale Weise auch Teile der Druckmittelversorgung innerhalb der Vorrichtung und angrenzender Baugruppen. Dadurch verringern sich die Anzahl der benötigten Bauteile und die Komplexität der Vorrichtung erheblich. Thus, the fastener assumes not only the functionalities of attaching the phase adjusting device with the camshaft and the volume accumulator with the camshaft, but realized in a simple, cost-neutral manner also parts of the pressure medium supply within the device and adjacent assemblies. This considerably reduces the number of components required and the complexity of the device.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung und aus den Zeichnungen in denen ein Ausführungsbeispiel der Erfindung vereinfacht dargestellt ist. Es zeigen: Further features of the invention will become apparent from the following description and from the drawings in which an embodiment of the invention is shown in simplified form. Show it:
Figur 1 nur sehr schematisch eine Brennkraftmaschine Figur 2 einen Längsschnitt durch eine erfindungsgemäße Vorrichtung Figure 1 only very schematically an internal combustion engine Figure 2 is a longitudinal section through a device according to the invention
Figur 3 eine vergrößerte Darstellung der Einzelheit X aus Figur 2 3 shows an enlarged view of the detail X of Figure 2
Figur 4 perspektivische Darstellung eines Befestigungselements. Figure 4 perspective view of a fastener.
Ausführliche Beschreibung der Zeichnungen Detailed description of the drawings
In Figur 1 ist eine Brennkraftmaschine 1 skizziert, wobei ein auf einer Kurbelwelle 2 sitzender Kolben 3 in einem Zylinder 4 angedeutet ist. Die Kurbelwelle 2 steht in der dargestellten Ausführungsform über je einen Zugmitteltrieb 5 mit einer Einlassnockenwelle 6 bzw. Auslassnockenwelle 7 in Verbindung, wobei eine erste und eine zweite Vorrichtung 1 1 für eine Relativdrehung zwischen Kurbelwelle 2 und den Nockenwellen 6, 7 sorgen können. Nocken 8 der Nockenwellen 6, 7 betätigen ein oder mehrere Einlassgaswechselventile 9 bzw. ein oder mehrere Auslassgaswechselventile 10. Ebenso kann vorgesehen sein nur eine der Nockenwellen 6, 7 mit einer Vorrichtung 1 1 auszustatten, oder nur eine Nockenwelle 6, 7 vorzusehen, welche mit einer Vorrichtung 1 1 versehen ist. Figur 2 zeigt eine erste Ausführungsform einer erfindungsgemäßen Vorrichtung 1 1 im Längs- bzw. im Querschnitt. Die Vorrichtung 1 1 weist eine Phasenstelleinrichtung 12, eine Nockenwelle 6, 7, eine Zentralschraube 13 und ein erstes Befestigungselement 14 auf. Die Phasenstelleinrichtung 12 ist als hydraulischer Stellantrieb ausgebildet, wobei diese mittels eines Zugmittel- oder Zahn- radtriebes 5 von der Kurbelwelle 2 in Rotation versetzt wird und drehfest mit der Nockenwelle 6, 7 verbunden ist. Durch Druckmittelzufuhr zu einer Gruppe von nicht dargestellten Druckkammern des hydraulischen Stellantriebs der Phasenstelleinrichtung 12 bei gleichzeitigem Druckmittelabfluss von einer zweiten Gruppe von ebenfalls nicht dargestellten Druckkammern kann die Phasenlage der Nockenwelle 6, 7 relativ zu der Kurbelwelle 2 in einem definierten Winkelintervall variabel eingestellt werden. Derartige Phasenstelleinrichtungen 12 sind der Fachwelt bekannt und beispielsweise in der DE 42 18 082 A1 oder der DE 10 2005 060 1 1 1 A1 offenbart. 1 shows 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 1 1 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 Auslassgaswechselventile 10. Also can be provided only one of the camshafts 6, 7 equip with a device 1 1, or provide only a camshaft 6, 7, which with a device 1 1 is provided. Figure 2 shows a first embodiment of a device according to the invention 1 1 in the longitudinal or in the cross section. The device 11 has a phase adjusting device 12, a camshaft 6, 7, a central screw 13 and a first fastening element 14. The phase adjusting device 12 is designed as a hydraulic actuator, which is offset by means of a Zugmittel- or gear wheel drive 5 of the crankshaft 2 in rotation and rotationally fixed to the camshaft 6, 7 is connected. By pressure medium supply to a group of pressure chambers, not shown, of the hydraulic actuator of the phase adjusting device 12 at the same pressure medium outflow of a second group of pressure chambers, also not shown, the phase angle of the camshaft 6, 7 can be variably adjusted relative to the crankshaft 2 in a defined angular interval. Such phase adjusting devices 12 are known in the art and disclosed for example in DE 42 18 082 A1 or DE 10 2005 060 1 1 1 A1.
Die Phasenstelleinrichtung 12 ist an einem axialen Ende der Nockenwelle 6, 7 angeordnet und liegt in axialer Richtung an einem an der Nockenwelle 6, 7 ausgebildeten Axialanschlag an. Mittels der Zentralschraube 13 ist die Pha- senstelleinrichtung 12 drehfest mit der Nockenwelle 6, 7 verbunden. Zu diesem Zweck durchgreift die Zentralschraube 13 die Phasenstelleinrichtung 12, wobei ein Ende der Zentralschraube 13 mit einem sich in radialer Richtung erstreckenden Bund ausgebildet ist. Der Bund liegt an einer der Nockenwelle 6, 7 abgewandten Seitenfläche der Phasenstelleinrichtung 12 an. An dem anderen Ende der Zentralschraube 13 ist ein erstes Gewinde 15 ausgebildet. The phase adjusting device 12 is arranged at one axial end of the camshaft 6, 7 and is located in the axial direction on an axial stop formed on the camshaft 6, 7. By means of the central screw 13, the phase adjusting device 12 is rotatably connected to the camshaft 6, 7. For this purpose, the central screw 13 passes through the phase adjusting device 12, wherein one end of the central screw 13 is formed with a radially extending collar. The collar abuts on one of the camshaft 6, 7 facing away from side surface of the phase adjusting device 12. At the other end of the central screw 13, a first thread 15 is formed.
Die Nockenwelle 6, 7 ist als Hohlwelle ausgebildet und weist einen Hohlraum 16 auf, der sich entlang der gesamten Nockenwelle 6, 7 erstreckt. Innerhalb des Hohlraums 16 ist das erste Befestigungselement 14 angeordnet und orts- fest, d.h. in axialer und radialer Richtung unverschiebbar, an der Nockenwelle 6, 7 befestigt. In der dargestellten Ausführungsform ist dies mittels einer Presspassung zwischen einer Außenmantelfläche des ersten Befestigungselements 14 und einer Mantelfläche 16a des Hohlraums 16 realisiert. Das erste Befestigungselement 14 weist in einer zentralen Durchgangsbohrung ein zwei- tes Gewinde 17 auf, in das das erste Gewinde 15 der Zentralschraube 13 eingreift, so dass die Phasenstelleinrichtung 12 drehfest mit der Nockenwelle 6, 7 verbunden ist. The camshaft 6, 7 is formed as a hollow shaft and has a cavity 16 which extends along the entire camshaft 6, 7. Within the cavity 16, the first fastener 14 is disposed and fixed in place, i. in the axial and radial directions immovably fixed to the camshaft 6, 7. In the illustrated embodiment, this is realized by means of a press fit between an outer circumferential surface of the first fastening element 14 and a lateral surface 16 a of the cavity 16. The first fastening element 14 has, in a central through-bore, a second thread 17 into which the first thread 15 of the central screw 13 engages, so that the phase-adjusting device 12 is non-rotatably connected to the camshaft 6, 7.
Innerhalb des Hohlraums 16 der Nockenwelle 6, 7 ist ein Volumenspeicher 18 angeordnet. Der Volumenspeicher 18 weist ein Gehäuse 19, ein Trennelement 20, welches als Kolben 20 ausgebildet ist, und ein Federelement 21 auf. Das Gehäuse 19 ist im Wesentlichen hohlzylindrisch mit jeweils einer Öffnung 22 an jeder axialen Stirnseite ausgebildet, wobei sich das Gehäuse 19 an dessen axialen Enden 23 radial nach innen erstreckt. Der Außendurchmesser des Gehäuses 19 ist geringer als der Durchmesser des Hohlraums 16 ausgebildet. Der Kolben 20 ist als dünnwandiges, topfförmiges Blechbauteil ausgebildet und innerhalb des Gehäuses 19 axialverschiebbar gelagert. Dabei trennt der Kol- ben 20 das Innere des Gehäuses 19 in einen Vorratsraum 24 und einen Komplementärraum 25. Within the cavity 16 of the camshaft 6, 7, a volume accumulator 18 is arranged. The volume accumulator 18 has a housing 19, a separating element 20, which is designed as a piston 20, and a spring element 21. The housing 19 is substantially hollow cylindrical, each having an opening 22 formed on each axial end face, wherein the housing 19 at its axial ends 23 extends radially inwardly. The outer diameter of the housing 19 is formed smaller than the diameter of the cavity 16. The piston 20 is formed as a thin-walled, cup-shaped sheet metal component and mounted axially displaceable within the housing 19. In this case, the piston 20 separates the interior of the housing 19 into a storage space 24 and a complementary space 25.
Das Federelement 21 ist in dem Komplementärraum 25 angeordnet und stützt sich einerseits an der dem Vorratsraum 24 abgewandten Seite des Kolbens 20 und andererseits an dem sich radial nach innen erstreckenden Bereich des Gehäuses 19 ab. The spring element 21 is arranged in the complementary space 25 and is supported on the one hand on the side facing away from the reservoir 24 of the piston 20 and on the other hand on the radially inwardly extending portion of the housing 19 from.
Die axialen Enden 23 des Gehäuses 19 liegen jeweils an einer konischen Anlagefläche 26 an (Figuren 2 und 3). Die erste konische Anlagefläche 26 ist an der der Phasenstelleinrichtung 12 abgewandten Seite des ersten Befestigungselements 14 als Innenkonus ausgebildet. Die zweite Anlagefläche 26 ist an einem zweiten Befestigungselement 27 ausgebildet, das ortsfest mit der Nockenwelle 6, 7 verbunden und an dem der Phasenstelleinrichtung 12 abgewandten Ende der Nockenwelle 6, 7 angeordnet ist. Dabei ist die zweite Anla- gefläche 26 als Außenkonus ausgebildet. Der Volumenspeicher 18 wird durch die Anlage des Gehäuses 19 an den konischen Anlageflächen 26 in dem Hohlraum 16 in axialer Richtung fixiert und zur Längsachse der Nockenwelle 6, 7 zentriert. Da der Außendurchmesser des im Wesentlichen hohlzylindrisch ausgebildeten Gehäuses 19 kleiner als der Innendurchmesser der Mantelfläche 16a der Nockenwelle 6, 7 ausgebildet ist, ist zwischen dem Gehäuse 19 und der Mantelfläche 16a ein Ringspalt 28 realisiert. Somit besteht nicht die Gefahr, dass das Gehäuse 19 während des Positionierens in dem Hohlraum 16 durch Unebenheiten an dessen Mantelfläche 16a deformiert wird. Dadurch ist sichergestellt, dass der Kolben 20 innerhalb des Gehäuses 19 nicht verklemmt, sondern leichtgängig verschiebbar ist. Somit entfällt eine kosten- und zeitintensive spanende Nachbearbeitung der Mantelfläche 16a der Nockenwelle 6, 7. Der Ringspalt 28 erstreckt sich ausgehend von dem ersten Befestigungselement 14 entlang der gesamten Nockenwelle 6, 7 und überdeckt insbesondere mehrere Nockenwellelagerstellen 29. Im Bereich der Nockenwellenlagerstellen 29 sind jeweils mehrere Bohrungen 30 an der Nockenwelle 6, 7 ausgebildet, die einerseits mit dem Ringspalt 28 und andererseits mit der jeweiligen Nockenwellenlagerstelle 29 kommunizieren. Der Ringspalt 28 ist durch das zweite Befestigungselement 27 in axialer Richtung abgedichtet. Das erste Befestigungselement 14 weist an dessen Außenmantelfläche erste Druckmittelkanäle 31 in Form von sich in axialer Richtung erstreckenden Nuten auf (Figur 4), so dass der Ringspalt 28 mit einem Aufnahmebereich 13a des Hohlraums 16 kommuniziert, in dem die Zentralschraube 13 angeordnet ist. The axial ends 23 of the housing 19 in each case abut against a conical contact surface 26 (FIGS. 2 and 3). The first conical contact surface 26 is formed on the side facing away from the phase adjusting device 12 side of the first fastening element 14 as an inner cone. The second contact surface 26 is formed on a second fastening element 27 which is fixedly connected to the camshaft 6, 7 and arranged at the end of the camshaft 6, 7 facing away from the phase adjusting device 12. In this case, the second contact surface 26 is designed as an outer cone. The volume accumulator 18 is fixed by the abutment of the housing 19 on the conical contact surfaces 26 in the cavity 16 in the axial direction and centered to the longitudinal axis of the camshaft 6, 7. Since the outer diameter of the substantially hollow cylindrical housing 19 is smaller than the inner diameter of the lateral surface 16a of the camshaft 6, 7, an annular gap 28 is realized between the housing 19 and the lateral surface 16a. Thus, there is no risk that the housing 19 is deformed during positioning in the cavity 16 by bumps on the lateral surface 16 a. This ensures that the piston 20 is not jammed within the housing 19, but is easily displaced. Thus, a costly and time-consuming machining post-processing of the lateral surface 16a of the camshaft 6, 7 eliminates. The annular gap 28 extends from the first fastening element 14 along the entire camshaft 6, 7 and covers in particular a plurality of camshaft bearing points 29. In the area of the camshaft bearing points 29 are each a plurality of holes 30 formed on the camshaft 6, 7, on the one hand with the annular gap 28 and on the other hand communicate with the respective camshaft bearing point 29. The annular gap 28 is sealed by the second fastening element 27 in the axial direction. The first fastening element 14 has on its outer lateral surface first pressure medium channels 31 in the form of grooves extending in the axial direction (FIG. 4), so that the annular gap 28 communicates with a receiving region 13a of the cavity 16, in which the central screw 13 is arranged.
Während des Betriebs der Brennkraftmaschine 1 wird Druckmittel, das von einer nicht dargestellten Druckmittelpumpe gefördert wird, über Bohrungen 30, die im Bereich der ersten Nockenwellenlagerstelle 29a an der Nockenwelle 6, 7 ausgebildet sind, dem Aufnahmebereich 13a zugeführt. Über die ersten Druckmittelkanäle 31 , den Ringspalt 28 und die Bohrungen 30 gelangt das Druckmittel zu den Nockenwellenlagerstellen 29. Dabei verhindert das zweite Befestigungselement 27 den Austritt von Druckmittel an der der Phasenstelleinrich- tung 12 abgewandten Seite der Nockenwelle 6, 7. During operation of the internal combustion engine 1, pressure medium, which is conveyed by a pressure medium pump, not shown, via bores 30, which are formed in the region of the first camshaft bearing point 29a on the camshaft 6, 7, the receiving portion 13a. Via the first pressure medium channels 31, the annular gap 28 and the bores 30, the pressure medium reaches the camshaft bearing points 29. The second fastening element 27 prevents the escape of pressure medium at the side of the camshaft 6, 7 facing away from the phase adjusting device 12.
Gleichzeitig gelangt das Druckmittel über Schraubenöffnungen 32 in das Innere der hohl ausgeführten Zentralschraube 13. Innerhalb der Zentralschraube 13 gelangt das Druckmittel einerseits über ein in dem Inneren der Zentral- schraube 13 angeordnetes, nicht dargestelltes, hydraulisches Wegeproportio- nalventil zu der Phasenstelleinrichtung 12. Derartige Wegeproportionalventile sind beispielsweise aus der DE 10 2005 052 481 A1 bekannt. Des Weiteren gelangt bei ausreichender Druckmittelversorgung der Phasenstelleinrichtung 12 überschüssiges Druckmittel über einen in der Zentralschraube 13 ausgebil- deten zweite Druckmittelkanal 33 zu der vorratsraumseitigen Öffnung 22 des Gehäuses 19 des Volumenspeichers 18 und wird dem Vorratsraum 24 zugeführt. Dadurch wird der Kolben 20 gegen die Kraft des Federelements 21 verschoben, wodurch das Volumen des Vorratsraums 24 auf Kosten des Volu- mens des Komplementärraunns 25 zunimmt. Übersteigt das von der Phasenstelleinrichtung 12 benötigte Druckmittelvolumen das von der Druckmittelpumpe geförderte Druckmittelvolumen, wird der Kolben 20 auf Grund der von dem Federelement 21 auf diesen ausgeübten Kraft in die entgegengesetzte Rich- tung verschoben und somit das in dem Volumenspeicher 18 gespeicherte Druckmittel über den zweiten Druckmittelkanal 33 der Phasenstelleinrichtung 12 zugeführt. At the same time, the pressure medium passes through screw openings 32 into the interior of the hollow central screw 13. Within the central screw 13, the pressure medium reaches the phase adjustment device 12 via a hydraulic directional proportional valve, not shown, arranged on the inside of the central screw 13. Such proportional directional valves are known for example from DE 10 2005 052 481 A1. Furthermore, with sufficient pressure medium supply to the phase adjusting device 12, excess pressure medium passes through a second pressure medium channel 33 formed in the central screw 13 to the reservoir-side opening 22 of the housing 19 of the volume accumulator 18 and is supplied to the reservoir 24. As a result, the piston 20 is displaced against the force of the spring element 21, as a result of which the volume of the storage space 24 is at the expense of volume. mens of Complementary Brown 25 increases. If the pressure medium volume required by the phase adjusting device 12 exceeds the pressure medium volume delivered by the pressure medium pump, the piston 20 is displaced in the opposite direction due to the force exerted by the spring element 21 and thus the pressure medium stored in the volume memory 18 is transferred via the second pressure medium channel 33 of the phase adjusting device 12 is supplied.
Somit erfolgt die Druckmittelversorgung der Phasenstelleinrichtung 12, des Volumenspeichers 18 und der Nockenwellenlagerstellen 29 über das Innere der Nockenwelle 6, 7, wobei keine zusätzlichen Bauteile benötigt werden. Eine gesonderte Druckmittelversorgung der Nockenwellenlagerstellen 29 ist nicht erforderlich. Das zweite Befestigungselement 27 weist eine axial verlaufende, zentrale Durchgangsöffnung 34 auf, über die der Komplementärraum 25 mit dem Inneren der Brennkraftmaschine 1 kommuniziert. Somit kann Luft und Druckmittel aus dem Komplementärraum 25 entweichen. Thus, the pressure medium supply of the phase adjusting device 12, the volume memory 18 and the camshaft bearing points 29 via the interior of the camshaft 6, 7, wherein no additional components are needed. A separate pressure medium supply of the camshaft bearing points 29 is not required. The second fastening element 27 has an axially extending, central passage opening 34, via which the complementary space 25 communicates with the interior of the internal combustion engine 1. Thus, air and pressure medium escape from the complementary space 25.
Bezugszeichen reference numeral
1 Brennkraftmaschine 1 internal combustion engine
2 Kurbelwelle  2 crankshaft
3 Kolben  3 pistons
4 Zylinder  4 cylinders
5 Zugmitteltrieb  5 traction drive
6 Einlassnockenwelle  6 intake camshaft
7 Auslassnockenwelle  7 exhaust camshaft
8 Nocken  8 cams
9 Einlassgaswechselventil  9 inlet gas exchange valve
10 Auslassgaswechselventil  10 outlet gas exchange valve
1 1 Vorrichtung  1 1 device
12 Phasenstelleinrichtung  12 phase adjusting device
13 Zentralschraube  13 central screw
13a Aufnahmebereich  13a recording area
14 erstes Befestigungselement  14 first fastening element
15 erstes Gewinde  15 first thread
16 Hohlraum  16 cavity
16a Mantelfläche  16a lateral surface
17 zweites Gewinde  17 second thread
18 Volumenspeicher  18 volume memory
19 Gehäuse  19 housing
20 Trennelement / Kolben  20 separating element / piston
21 Federelement  21 spring element
22 Öffnung  22 opening
23 axiales Ende  23 axial end
24 Vorratsraum  24 pantry
25 Komplementärraum  25 Complementary space
26 Anlagefläche  26 contact surface
27 zweites Befestigungselement  27 second fastening element
28 Ringspalt Nockenwellenlagerstellea erste Nockenwellenlagerstelle Bohrung 28 annular gap Camshaft bearing first camshaft bearing bore
erster Druckmittelkanal Schraubenöffnung  first pressure medium channel screw opening
zweiter Druckmittelkanal Durchgangsöffnung  second pressure medium passage passage opening

Claims

Patentansprüche claims
1 . Vorrichtung (1 1 ) zur variablen Einstellung der Steuerzeiten von Gaswechselventilen (9, 10) einer Brennkraftmaschine (1 ) mit 1 . Device (1 1) for variably setting the control times of gas exchange valves (9, 10) of an internal combustion engine (1) with
- einer hydraulischen Phasenstelleinrichtung (12), einer Nockenwelle (6, 7), einem Volumenspeicher (18), einem separat zur Nockenwelle (6, 7) ausgebildeten ersten Befestigungselement (14) und einer Zentralschraube (13),a hydraulic phase adjusting device (12), a camshaft (6, 7), a volume accumulator (18), a first fastening element (14) formed separately from the camshaft (6, 7), and a central screw (13),
- wobei die Zentralschraube (13) die Phasenstelleinrichtung (12) durchgreift und - Wherein the central screw (13) passes through the phase adjusting device (12) and
- wobei ein Ende der Zentralschraube (13) an einer axialen Seitenfläche der Phasenstelleinrichtung (12) anliegt und an dem anderen Ende ein erstes Gewinde (15) ausgebildet ist, - Wherein one end of the central screw (13) abuts an axial side surface of the phase adjusting device (12) and at the other end a first thread (15) is formed,
dadurch gekennzeichnet, dass das Innere der Nockenwelle (6, 7) einen Hohlraum (16) aufweist, in dem das erste Befestigungselement (14) ortsfest aufgenommen ist,  characterized in that the interior of the camshaft (6, 7) has a cavity (16) in which the first fastening element (14) is received in a stationary manner,
- wobei an dem ersten Befestigungselement (14) ein zweites Gewinde (17) ausgebildet ist, das mit dem ersten Gewinde (15) der Zentralschraube (13) derart zusammenwirkt, dass eine drehfeste Verbindung zwischen der Vorrichtung (1 1 ) und der Nockenwelle (6, 7) hergestellt wird und  - Wherein on the first fastening element (14) a second thread (17) is formed, which cooperates with the first thread (15) of the central screw (13) such that a rotationally fixed connection between the device (1 1) and the camshaft (6 , 7) is produced and
- wobei in dem Hohlraum (16) ein Volumenspeicher (18) mit einem Gehäuse (19) angeordnet ist, wobei ein axiales Ende (23) des Gehäuses (19) an einer Anlagefläche (26) des ersten Befestigungselements (14) anliegt. - In which the cavity (16) has a volume memory (18) is arranged with a housing (19), wherein an axial end (23) of the housing (19) on a contact surface (26) of the first fastening element (14).
2. Vorrichtung (1 1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass die An- lagefläche (26) in Richtung des Gehäuses (19) konisch ausgebildet ist. 2. Device (1 1) according to claim 1, characterized in that the contact surface (26) in the direction of the housing (19) is conical.
3. Vorrichtung (1 1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass das erste Befestigungselement (14) oder die Zentralschraube (13) einen in axialer Richtung verlaufenden Druckmittelkanal (31 , 33) aufweist, der auf der der Phasenstelleinrichtung (12) abgewandten Seite des ersten Befestigungselements (14) in den Hohlraum (16) mündet. Vorrichtung (1 1 ) nach Anspruch 3, dadurch gekennzeichnet, dass der Druckmittelkanal (31 , 33) als Bohrung (33) innerhalb der Zentralschraube (13) ausgebildet ist. 3. Device (1 1) according to claim 1, characterized in that the first fastening element (14) or the central screw (13) has a pressure medium channel extending in the axial direction (31, 33) on the side facing away from the phase adjusting device (12) of the first fastening element (14) opens into the cavity (16). Device (1 1) according to claim 3, characterized in that the pressure medium channel (31, 33) is formed as a bore (33) within the central screw (13).
Vorrichtung (1 1 ) nach Anspruch 3, dadurch gekennzeichnet, dass der Druckmittelkanal (31 , 33) an einer Außenmantelfläche des ersten Befesti- gungselements (14) ausgebildet ist. Device (1 1) according to claim 3, characterized in that the pressure medium channel (31, 33) is formed on an outer circumferential surface of the first fastening element (14).
Vorrichtung (1 1 ) nach Anspruch 3, dadurch gekennzeichnet, dass der Druckmittelkanal (31 , 33) mit dem Volumenspeicher (16) kommuniziert. Device (1 1) according to claim 3, characterized in that the pressure medium channel (31, 33) communicates with the volume memory (16).
Vorrichtung (1 1 ) nach Anspruch 3, dadurch gekennzeichnet, dass der Druckmittelkanal (31 , 33) mit einer Nockenwellenlagerstelle (29) kommuniziert. Device (1 1) according to claim 3, characterized in that the pressure medium channel (31, 33) communicates with a camshaft bearing point (29).
EP11701237.7A 2010-02-15 2011-01-20 Device for variable adjustment of the control times of gas exchange valves of an internal combustion engine Not-in-force EP2536925B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010008002A DE102010008002A1 (en) 2010-02-15 2010-02-15 Device for the variable adjustment of the timing of gas exchange valves of an internal combustion engine
PCT/EP2011/050745 WO2011098330A1 (en) 2010-02-15 2011-01-20 Device for variable adjustment of the control times of gas exchange valves of an internal combustion engine

Publications (2)

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EP2536925A1 true EP2536925A1 (en) 2012-12-26
EP2536925B1 EP2536925B1 (en) 2014-12-10

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US (1) US8662041B2 (en)
EP (1) EP2536925B1 (en)
CN (1) CN102762822B (en)
BR (1) BR112012020001A2 (en)
DE (1) DE102010008002A1 (en)
WO (1) WO2011098330A1 (en)

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DE102011082591A1 (en) 2011-09-13 2013-03-14 Schaeffler Technologies AG & Co. KG Axial bearing with double camshafts, camshaft adjusting device and internal combustion engine

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DE10125498A1 (en) * 2001-05-23 2002-12-19 Salzgitter Antriebstechnik Gmb Camshaft and method for manufacturing a camshaft
DE10134320A1 (en) * 2001-07-14 2003-01-23 Ina Schaeffler Kg Device for changing the control times of gas shuttle valves in internal combustion engines comprises a driven unit axially, radially and peripherally locked on a sleeve and screwed in a deformation-free manner on a camshaft
DE10228354B4 (en) 2002-06-25 2017-06-22 Daimler Ag Device for supplying pressure to a camshaft adjusting device
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CN102762822B (en) 2014-06-11
US20120304947A1 (en) 2012-12-06
CN102762822A (en) 2012-10-31
DE102010008002A1 (en) 2011-08-18
EP2536925B1 (en) 2014-12-10
WO2011098330A1 (en) 2011-08-18
US8662041B2 (en) 2014-03-04
BR112012020001A2 (en) 2019-09-24

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