EP1646769A1 - Device for altering the control times of gas exchange valves in an internal combustion engine, in particular a rotating piston adjustment device for the rotation angle adjustment of a camshaft relative to a crankshaft - Google Patents

Device for altering the control times of gas exchange valves in an internal combustion engine, in particular a rotating piston adjustment device for the rotation angle adjustment of a camshaft relative to a crankshaft

Info

Publication number
EP1646769A1
EP1646769A1 EP04734221A EP04734221A EP1646769A1 EP 1646769 A1 EP1646769 A1 EP 1646769A1 EP 04734221 A EP04734221 A EP 04734221A EP 04734221 A EP04734221 A EP 04734221A EP 1646769 A1 EP1646769 A1 EP 1646769A1
Authority
EP
European Patent Office
Prior art keywords
impeller
coil spring
compression coil
hole
hollow cylindrical
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
EP04734221A
Other languages
German (de)
French (fr)
Other versions
EP1646769B1 (en
Inventor
Mike Kohrs
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.)
IHO Holding GmbH and Co KG
Original Assignee
Schaeffler 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 KG filed Critical Schaeffler KG
Publication of EP1646769A1 publication Critical patent/EP1646769A1/en
Application granted granted Critical
Publication of EP1646769B1 publication Critical patent/EP1646769B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft
  • the invention relates to a device for changing the timing of gas exchange valves of an internal combustion engine according to the precharacterizing features of claim 1, and it can be realized particularly advantageously on a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft.
  • the impeller has on the circumference of its wheel hub five vanes which extend radially into the working spaces and which divide the working spaces into two hydraulic pressure chambers which act against one another and which, when selectively or simultaneously pressurized with a hydraulic pressure medium, swivel or fix the impeller relative to the Drive wheel and thus the camshaft with respect to the crankshaft.
  • the impeller can be mechanically coupled to the drive wheel by means of a separate locking element in a preferred base position within its adjustment range, in particular when the internal combustion engine is restarted until the required pressure medium pressure builds up to avoid the rattling of the impeller on the boundary walls of the drive wheel resulting from the alternating torques of the camshaft.
  • This locking element which is designed as a cylindrical locking pin, can be displaced into a locking position within a receptacle in the side wall of the drive wheel facing away from the camshaft and is arranged together with the spring element in a through bore in the wheel hub of the impeller, which is parallel to the longitudinal center axis of the device, by means of a spring element designed as a compression coil spring.
  • the locking pin has on its rear side an axial basic bore in which one end of the compression coil spring is fixed, while the other end of the compression coil spring is supported on a plastic counter-holder inserted into the through-hole with a centering tip, which in turn is in contact with the back through contact Side wall of the drive wheel is axially fixed.
  • a disadvantage of this known device is that the locking mechanism used is only suitable for a certain width of the impeller due to the fixing of the counter-holder for the compression coil spring on a side wall of the drive wheel, if the compression coil spring always has the same defined spring force on the locking pin should work.
  • the invention is therefore based on the object of designing a device for changing the control times of gas exchange valves of an internal combustion engine, in particular a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft, the locking mechanism of which for avoiding frictional contact of the counter holder for the compression coil spring of the locking pin a side wall of the drive wheel without adjusting the length of this counter-holder ensures compliance with a defined spring force acting on the locking pin even when used in devices with different widths of the impeller.
  • this object is achieved in a device according to the preamble of claim 1 in such a way that the counter-holder for the other End of the compression coil spring of the locking pin is designed as a hollow cylindrical cartridge which can be locked in any axial position within the through hole in the wheel hub of the impeller by force or positive locking.
  • the counter-holder as a freely positionable cartridge thus makes it possible to always position the counter-holder in exactly the axial position within the through-hole in the one with the compression coil spring, regardless of the width of the impeller or regardless of the axial length of the through-hole in the impeller the desired defined spring force is achieved on the locking pin.
  • the hollow cylindrical cartridge is designed as a stamped and drawn part made of sheet steel, which has a plate-shaped axial recess in its bottom end face for fixing the other end of the compression coil spring.
  • the diameter of this axial depression corresponds approximately to the outer diameter of the spring turns of the compression coil spring and the depth of the axial depression is preferably designed such that somewhat two spring turns of the compression coil spring are supported radially in the axial depression.
  • the cartridge has a ventilation bore opening into the longitudinal cavity of the cartridge, through which the hydraulic pressure medium accumulating behind the locking pin in the through bore in the impeller is discharged to a further ventilation bore in the adjacent side wall of the drive wheel.
  • An alternative development of the device designed according to the invention is also to design the hollow cylindrical cartridge with a peg-shaped axial extension for fixing the other end of the compression coil spring to its bottom end face.
  • the diameter of this axial extension corresponds approximately to the inside diameter of the spring turns of the compression coil spring and the length of the axial extension is in turn designed such that approximately two spring turns of the compression coil spring are supported radially on the axial extension.
  • a cartridge designed in this way can also be produced as a stamped and drawn part from a sheet steel and has no cutting as well as the first-mentioned embodiment, axially in the axial extension, a vent hole opening into the cavity of the cartridge for discharging the hydraulic pressure medium accumulating behind the locking pin in the through hole.
  • Such a first embodiment for locking the hollow cylindrical cartridge in the through bore is, for example, to design the cartridge on its outer surface with a slightly larger diameter than the through bore in the wheel hub of the impeller and to fix it in a force-fitting manner by press fit in this through bore.
  • the cartridge is pressed into the through bore from the camshaft-side bore opening until it reaches the position in the through bore defined by an auxiliary stop, which is inserted into the through bore, in which the compression coil spring exerts the desired defined spring force on the locking pin.
  • Another possible form of implementation to press-fit the cartridge into the through hole in the wheel hub of the impeller would also be to design the cartridge in the manner of a dowel pin with a longitudinal axial slot in its lateral surface and without a bottom, and to design the cartridge designed in this way Press the slot together into the through hole.
  • the other end of the compression coil spring is designed such that its first spring turn is supported on the then annular bottom surface before this cartridge.
  • the hollow cylindrical cartridge has a slight to form a smaller diameter than the through hole in the wheel hub of the impeller and to fix it positively by engaging its end edge on a circlip inserted in a circumferential groove in the through hole in the through hole.
  • the position of the cartridge in the through bore, in which the compression coil spring exerts the desired defined spring force on the locking pin is determined by taking into account the axial length of the cartridge by the circumferential groove in the through bore.
  • a third embodiment of the locking of the hollow cylindrical cartridge in the through bore is to design the hollow cylindrical cartridge also with a slightly smaller diameter than the through bore in the wheel hub of the impeller and with several open axial slots in its outer surface and an end edge that is angled outwards with which the cartridge is positively attached by clipping its end edge into a circumferential groove in the through hole in the same.
  • the cartridge designed in this way like that in accordance with the second embodiment, is inserted into the through-bore from the bore opening remote from the camshaft, the axial slots in the outer surface of the cartridge allowing the angled end edge to deflect into the through-bore.
  • the position of the cartridge in the through hole, in which the compression coil spring exerts the desired defined spring force on the locking pin is also determined in this embodiment by the positioning of the circumferential groove in the through hole, taking into account the axial length of the cartridge.
  • the device designed according to the invention for changing the control times of gas exchange valves of an internal combustion engine in particular a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft, thus has the advantage over the devices known from the prior art that their locking mechanism is formed by forming the counterhold of the Compression coil spring of the locking pin as a hollow cylindrical cartridge, which is fastened in the through hole in the wheel hub of the impeller by a force or form fit, can now be used in any device with different widths of the impeller without any adjustment work, and at the same time compliance with a defined, on the locking pin acting spring force guaranteed.
  • Figure 1 shows a longitudinal section through a device designed according to the invention
  • Figure 2 is an enlarged view of the detail Z of Figure 1 with a first embodiment of the fixation of the compression coil spring of the locking pin on its counter support and a first embodiment of the fixation of the counter holder in the through hole in the wheel hub of the impeller;
  • Figure 3 is an enlarged view of the detail Z of Figure 1 with a second embodiment of the fixing of the compression coil spring of the locking pin on its counter holder and the first embodiment of the fixing of the counter holder in the through hole in the wheel hub of the impeller;
  • Figure 4 is an enlarged view of the detail Z of Figure 1 with the second embodiment of the fixing of the compression coil spring of the locking pin on its counter-holder and a second embodiment of the fixing of the counter-holder in the through hole in the wheel hub of the impeller;
  • FIG. 5 shows an enlarged view of the detail Z according to FIG. 1 with the second embodiment of fixing the compression coil spring of the locking pin to its counter-holder and a third embodiment of fixing the counter-holder in the through hole in the wheel hub of the impeller.
  • this device 1 clearly shows a device 1 for changing the control times of gas exchange valves of an internal combustion engine, which is designed specifically as a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft and is fastened to the drive-side end of a camshaft, not shown, mounted in the cylinder head of the internal combustion engine is.
  • this device 1 is designed as a hydraulic actuator which can be controlled as a function of various operating parameters of the internal combustion engine and essentially consists of a drive wheel 2 which is in drive connection with the crankshaft of the internal combustion engine and an impeller 3 which is non-rotatably connected to the camshaft of the internal combustion engine has, as can also be seen from FIG.
  • the impeller 3 on the circumference of its wheel hub 8 has the same number of vanes 9 which extend radially into a working space of the drive wheel and which divide the working spaces into two hydraulic pressure chambers 10, 11 which act against one another and which, when selectively or simultaneously pressurized with a hydraulic pressure medium cause a pivoting movement or fixation of the impeller 3 with respect to the drive wheel 2 and thus the camshaft with respect to the crankshaft.
  • FIG. 1 it can be seen in FIG.
  • the device 1 has a separate locking element with which the impeller 3 can be mechanically coupled to the drive wheel 2 in a preferred base position within its adjustment range when the pressure of the pressure medium required for adjustment is undershot.
  • This locking element is clearly visible as a cylindrical locking pin 12 which can be moved by a spring element into a locking position within a receptacle 13 in the side wall 5 of the drive wheel 2.
  • the spring element is designed as a compression coil spring 14, which together with the locking pin 12 in a through hole parallel to the longitudinal central axis of the device 1 15 is arranged in the wheel hub 8 of the impeller and one end 17 of which can be fixed in an axial basic bore 16 on the rear side of the locking pin 12.
  • the other end 18 of the compression coil spring 14 for the locking pin 12 is supported on a counter-holder which is arranged in the through-bore 15 and is also clearly visible in FIG. 1 and which according to the invention as a force or form fit in any axial position within the through-bore 15 in the wheel hub 8 of the impeller 3 lockable hollow cylindrical cartridge 19 is formed.
  • the hollow cylindrical cartridge 19 is designed as a stamped and drawn part made of sheet steel, which has a plate-shaped axial recess 21 in its bottom end face 20 for fixing the other end 18 of the compression coil spring 14 , whose diameter corresponds to the outside diameter of the spring windings 22 of the compression coil spring 14.
  • the hollow cylindrical cartridge 19 can also be designed as a stamped and drawn part made of sheet steel, which, in order to fix the other end 18 of the compression coil spring 14 to its bottom end face 20, has a peg-shaped axial extension 23 whose diameter corresponds to the inside diameter of the spring windings 22 corresponds to the compression coil spring 14.
  • FIG. 2 and FIG. 3 also show a first embodiment of the fixing of the counter-holder in the through bore 15 in the wheel hub 8 of the impeller 3, which consists in the hollow cylindrical cartridge 19 having a slightly larger diameter on its outer surface 24. knife than the through hole 15 in the wheel hub 8 of the impeller 3 and is non-positively fixed by press fit in this through hole 15.
  • the second embodiment of fixing the counter-holder in the through-bore 15 in FIG. 4 differs in that the hollow cylindrical cartridge 19 has a slightly smaller surface area 24 ′ Diameter than the through hole 15 in the wheel hub 8 of the impeller 3 and is positively attached by abutment of its end edge 25 to a snap ring 27 inserted into a circumferential groove 26 in the through hole 15 in the through hole 15.
  • a likewise form-fitting fixation of the counter-holder in the through hole 15 is finally shown alternatively as a third embodiment in FIG. 5.
  • the hollow cylindrical cartridge 19 formed on its lateral surface 24 " likewise with a slightly smaller diameter than the through bore 15 in the wheel hub 8 of the impeller 3, has a plurality of open axial slots 28 in its lateral surface 24" as well as an outwardly angled end edge 25 'on, with which the cartridge 19 is fastened by clipping its end edge 25' into a circumferential groove 29 in the through hole 15 in the same.
  • Boundary wall 23 axial extension
  • Wheel hub 24 outer surface
  • Compression coil spring 27 snap ring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

The impeller (3) may be mechanically coupled to the drive wheel (2), by means of a locking pin (12), which may be displaced in a housing (13) in one of the side walls (5, 6) of the drive wheel (3), by means of a pressure coil spring (14) and which is arranged together therewith in a through drilling (15) in the wheel hub (8) of the impeller (3). One end of the pressure coil spring (14) is thus fixed in an axial base drilling on the back face of the locking pin (12), whilst the other end rests on a counter holder arranged in the through drilling (15). According to the invention, the counter holder for the other end of the pressure coil spring (14) is embodied as a hollow cylindrical cartridge (19), which may be fixed in a given axial position within the through drilling (15) in the wheel hub (8) of the impeller (3), by means of a friction or positive fit.

Description

Bezeichnung der Erfindung Name of the invention
Vorrichtung zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine, insbesondere Rotationskolben-Verstelleinrichtung zur Drehwinkelverstellung einer Nockenwelle gegenüber einer KurbelwelleDevice for changing the timing of gas exchange valves of an internal combustion engine, in particular a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft
Beschreibungdescription
Gebiet der ErfindungField of the Invention
Die Erfindung betrifft eine Vorrichtung zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine nach den oberbegriffsbildenden Merkmalen des Anspruchs 1 , und sie ist insbesondere vorteilhaft an einer Ro- tationskolben-Verstelleinrichtung zur Drehwinkelverstellung einer Nockenwelle gegenüber einer Kurbelwelle realisierbar. Hintergrund der ErfindungThe invention relates to a device for changing the timing of gas exchange valves of an internal combustion engine according to the precharacterizing features of claim 1, and it can be realized particularly advantageously on a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft. Background of the Invention
Aus der deutschen Offenlegungsschrift DE 101 50 856 A1 ist eine gattungsbildende Vorrichtung zum Verändern der Steuerzeiten von Gaswechsel ventilen einer Brennkraftmaschine bekannt, die am antriebsseitigen Ende einer im Zy- linderkopf der Brennkraftmaschine gelagerten Nockenwelle befestigt ist und im Prinzip als in Abhängigkeit von verschiedenen Betriebsparametern der Brennkraftmaschine steuerbarer hydraulischer Stellantrieb ausgebildet ist. Diese Vorrichtung besteht im Wesentlichen aus einem mit einer Kurbelwelle der Brennkraftmaschine in Antriebsverbindung stehenden Antriebsrad und aus einem drehfest mit einer Nockenwelle der Brennkraftmaschine verbundenen Flügelrad, wobei das Antriebsrad einen durch eine hohlzylindrische Umfangs- wand und zwei Seitenwände gebildeten Hohlraum aufweist, in dem durch fünf radiale Begrenzungswände fünf hydraulische Arbeitsräume gebildet werden. Das Flügelrad weist dementsprechend am Umfang seiner Radnabe fünf sich radial in die Arbeitsräume erstreckende Flügel auf, welche die Arbeitsräume in jeweils zwei gegeneinander wirkende hydraulische Druckkammern unterteilen, die bei wahlweiser oder gleichzeitiger Druckbeaufschlagung mit einem hydrau- lischen Druckmittel eine Schwenkbewegung oder Fixierung des Flügelrades gegenüber dem Antriebsrad und damit der Nockenwelle gegenüber der Kurbelwelle bewirken. Darüber hinaus ist das Flügelrad bei Unterschreitung eines zur Verstellung erforderlichen Druckmitteldrucks, wie beispielsweise beim Abschalten der Brennkraftmaschine, durch ein gesondertes Verriegelungselement in einer bevorzugten Basisposition innerhalb seines Verstellbereiches mit dem Antriebsrad mechanisch koppelbar, um insbesondere beim Neustart der Brennkraftmaschine bis zum Aufbau des erforderlichen Druckmitteldrucks ein aus den Wechselmomenten der Nockenwelle resultierendes Anschlagklappern des Flügelrades an den Begrenzungswänden des Antriebsrades zu vermeiden. Dieses, als zylindrischer Verriegelungsstift ausgebildete Verriegelungselement ist durch ein als Druckschraubenfeder ausgebildetes Federelement in eine Verriegelungsstellung innerhalb einer Aufnahme in der nockenwellenabgewandten Seitenwand des Antriebsrades verschiebbar und zusammen mit dem Federelement in einer zur Längsmittelachse der Vorrichtung parallelen Durchgangs- bohrung in der Radnabe des Flügelrades angeordnet. Dabei weist der Verriegelungsstift an seiner Rückseite eine axiale Grundbohrung auf, in der das eine Ende der Druckschraubenfeder fixiert wird, während das andere Ende der Druckschraubenfeder sich an einem in die Durchgangsbohrung eingesetzten Kunststoff-Gegenhalter mit einer Zentrierspitze abstützt, der seinerseits durch rückseitigen Kontakt mit einer Seitenwand des Antriebsrades axial fixiert wird.From the German patent application DE 101 50 856 A1 a generic device for changing the timing of gas exchange valves of an internal combustion engine is known, which is attached to the drive end of a camshaft mounted in the cylinder head of the internal combustion engine and in principle as a function of various operating parameters of the internal combustion engine controllable hydraulic actuator is formed. This device essentially consists of a drive wheel which is in drive connection with a crankshaft of the internal combustion engine and an impeller which is non-rotatably connected to a camshaft of the internal combustion engine, the drive wheel having a hollow space formed by a hollow cylindrical peripheral wall and two side walls, in which there are five radial ones Boundary walls five hydraulic work rooms are formed. Accordingly, the impeller has on the circumference of its wheel hub five vanes which extend radially into the working spaces and which divide the working spaces into two hydraulic pressure chambers which act against one another and which, when selectively or simultaneously pressurized with a hydraulic pressure medium, swivel or fix the impeller relative to the Drive wheel and thus the camshaft with respect to the crankshaft. In addition, when the pressure medium pressure required for adjustment, such as when the internal combustion engine is switched off, is undershot, the impeller can be mechanically coupled to the drive wheel by means of a separate locking element in a preferred base position within its adjustment range, in particular when the internal combustion engine is restarted until the required pressure medium pressure builds up to avoid the rattling of the impeller on the boundary walls of the drive wheel resulting from the alternating torques of the camshaft. This locking element, which is designed as a cylindrical locking pin, can be displaced into a locking position within a receptacle in the side wall of the drive wheel facing away from the camshaft and is arranged together with the spring element in a through bore in the wheel hub of the impeller, which is parallel to the longitudinal center axis of the device, by means of a spring element designed as a compression coil spring. The locking pin has on its rear side an axial basic bore in which one end of the compression coil spring is fixed, while the other end of the compression coil spring is supported on a plastic counter-holder inserted into the through-hole with a centering tip, which in turn is in contact with the back through contact Side wall of the drive wheel is axially fixed.
Nachteilig bei dieser bekannten Vorrichtung ist es jedoch, dass der verwendete Verriegelungsmechanismus durch die Fixierung des Gegenhalters für die Druckschraubenfeder an einer Seitenwand des Antriebsrades nur für eine be- stimmte Breite des Flügelrades geeignet ist, wenn die Druckschraubenfeder immer mit der gleichen definierten Federkraft auf den Verriegelungsstift wirken soll. Die Verwendung einer solchen Verriegelung an anderen Vorrichtungen mit jeweils unterschiedlicher Breite des Flügelrades macht somit zur Einhaltung der auf den Verriegelungsstift wirkenden definierten Federkraft immer eine Anpassung der Verriegelung an das jeweilige Flügelrad erforderlich, die in der Regel durch Ausführung des Gegenhalters der Druckschraubenfeder mit unterschiedlichen Längen erfolgt. Dadurch ist für jede Breite eines Flügelrades ein separater Gegenhalter für die Druckschraubenfedern notwendig, der bei einer entsprechenden Anzahl unterschiedlicher Vorrichtungen die ohnehin vorhandene Teilevielfalt und Fehlerhäufigkeit noch weiter erhöht und somit zu einer nachteiligen Erhöhung der Herstellungskosten für jede Vorrichtung beiträgt. Darüber hinaus hat sich die Fixierung des Gegenhalters für die Druckschrau- benfeder an einer Seitenwand des Antriebsrades auch dahingehend als nachteilig erwiesen, dass der Gegenhalter durch die Schwenkbewegungen des Flügelrades und den damit verbundenen Reibkontakt zur Seitenwand des Antriebsrades einem erhöhten Verschleiß unterliegt, durch den sich die auf den Verriegelungsstift wirkende Federkraft der Druckschraubenfeder stetig verrin- gert und somit die Einriegelzeit des Verriegelungsstiftes erhöht.A disadvantage of this known device, however, is that the locking mechanism used is only suitable for a certain width of the impeller due to the fixing of the counter-holder for the compression coil spring on a side wall of the drive wheel, if the compression coil spring always has the same defined spring force on the locking pin should work. The use of such a lock on other devices, each with a different width of the impeller, makes compliance the defined spring force acting on the locking pin always requires an adjustment of the locking to the respective impeller, which is usually carried out by designing the counter-holder of the compression coil spring with different lengths. As a result, a separate counter-holder for the compression coil springs is required for each width of an impeller, which, with a corresponding number of different devices, further increases the already existing variety of parts and frequency of errors and thus contributes to a disadvantageous increase in the manufacturing costs for each device. In addition, the fixation of the counter-holder for the compression coil spring on a side wall of the drive wheel has also proven to be disadvantageous in that the counter-holder is subject to increased wear due to the pivoting movements of the impeller and the associated frictional contact with the side wall of the drive wheel The spring force of the compression coil spring acting on the locking pin is continuously reduced, thus increasing the locking time of the locking pin.
Aufgabe der ErfindungObject of the invention
Der Erfindung liegt deshalb die Aufgabe zugrunde, eine Vorrichtung zum Ver- ändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine, insbesondere Rotationskolben-Verstelleinrichtung zur Drehwinkelverstellung einer Nockenwelle gegenüber einer Kurbelwelle, zu konzipieren, deren Verriegelungsmechanismus bei Vermeidung eines Reibkontaktes des Gegenhalters für die Druckschraubenfeder des Verriegelungsstiftes zu einer Seitenwand des Antriebsrades ohne Anpassung der Länge dieses Gegenhalters auch bei einem Einsatz in Vorrichtungen mit jeweils unterschiedlicher Breite des Flügelrades die Einhaltung einer definierten, auf den Verriegelungsstift wirkenden Federkraft gewährleistet. Zusammenfassung der ErfindungThe invention is therefore based on the object of designing a device for changing the control times of gas exchange valves of an internal combustion engine, in particular a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft, the locking mechanism of which for avoiding frictional contact of the counter holder for the compression coil spring of the locking pin a side wall of the drive wheel without adjusting the length of this counter-holder ensures compliance with a defined spring force acting on the locking pin even when used in devices with different widths of the impeller. Summary of the invention
Erfindungsgemäß wird diese Aufgabe bei einer Vorrichtung nach dem Oberbegriff des Anspruchs 1 derart gelöst, dass der Gegenhalter für das andere Ende der Druckschraubenfeder des Verriegelungsstiftes als hohlzylindrische Patrone ausgebildet ist, die durch Kraft- oder Formschluss in einer beliebigen Axialposition innerhalb der Durchgangsbohrung in der Radnabe des Flügelrades arretierbar ist. Eine derartige Ausbildung des Gegenhalters als frei positio- nierbare Patrone ermöglicht es somit, den Gegenhalter unabhängig von der Breite des Flügelrades bzw. unabhängig von der axialen Länge der Durchgangsbohrung im Flügelrad immer in genau derjenigen Axialposition innerhalb der Durchgangsbohrung zu positionieren, in der mit der Druckschraubenfeder die erwünschte definierte Federkraft auf den Verriegelungsstift erzielt wird.According to the invention, this object is achieved in a device according to the preamble of claim 1 in such a way that the counter-holder for the other End of the compression coil spring of the locking pin is designed as a hollow cylindrical cartridge which can be locked in any axial position within the through hole in the wheel hub of the impeller by force or positive locking. Such a configuration of the counter-holder as a freely positionable cartridge thus makes it possible to always position the counter-holder in exactly the axial position within the through-hole in the one with the compression coil spring, regardless of the width of the impeller or regardless of the axial length of the through-hole in the impeller the desired defined spring force is achieved on the locking pin.
In zweckmäßiger Weiterbildung der erfindungsgemäß ausgebildeten Vorrichtung ist die hohlzylindrische Patrone dabei als Stanzziehteil aus einem Stahlblech ausgebildet, welche zu Fixierung des anderen Endes der Druckschraubenfeder in ihrer Bodenstirnfläche eine tellerförmige Axialvertiefung aufweist. Der Durchmesser dieser Axialvertiefung entspricht ungefähr dem Außendurchmesser der Federwindungen der Druckschraubenfeder und die Tiefe der Axialvertiefung ist bevorzugt derart ausgebildet, dass etwas zwei Federwindungen der Druckschraubenfeder in der Axialvertiefung radial abgestützt sind. Zusätzlich weist die Patrone längsaxial in der Axialvertiefung eine in den Hohlraum der Patrone mündende Entlüftungsbohrung auf, durch welche hindurch sich das hinter dem Verriegelungsstift in der Durchgangsbohrung im Flügelrad ansammelnde hydraulische Druckmittel zu einer weiteren Entlüftungsbohrung in der angrenzenden Seitenwand des Antriebsrades abgeführt wird.In an expedient development of the device designed according to the invention, the hollow cylindrical cartridge is designed as a stamped and drawn part made of sheet steel, which has a plate-shaped axial recess in its bottom end face for fixing the other end of the compression coil spring. The diameter of this axial depression corresponds approximately to the outer diameter of the spring turns of the compression coil spring and the depth of the axial depression is preferably designed such that somewhat two spring turns of the compression coil spring are supported radially in the axial depression. In addition, the cartridge has a ventilation bore opening into the longitudinal cavity of the cartridge, through which the hydraulic pressure medium accumulating behind the locking pin in the through bore in the impeller is discharged to a further ventilation bore in the adjacent side wall of the drive wheel.
Eine alternative Weiterbildung der erfindungsgemäß ausgebildeten Vorrichtung ist es auch, die hohlzylindrische Patrone zur Fixierung des anderen Endes der Druckschraubenfeder an ihrer Bodenstirnfläche mit einer zapfenförmigen Axialverlängerung auszubilden. Der Durchmesser dieser Axialverlängerung entspricht dabei ungefähr den Innendurchmesser der Federwindungen der Druck- schraubenfeder und die Länge der Axialverlängerung ist wiederum so ausgebildet, dass etwa zwei Federwindungen der Druckschraubenfeder auf der Axialverlängerung radial abgestützt werden. Auch eine derart ausgebildete Patrone ist als Stanzziehteil aus einem Stahlblech spanlos herstellbar und weist ebenso wie die erstgenannte Ausführung längsaxial in der Axialverlängerung eine in den Hohlraum der Patrone mündende Entlüftungsbohrung zur Abführung des sich hinter dem Verriegelungsstift in der Durchgangsbohrung ansammelnden hydraulischen Druckmittels auf.An alternative development of the device designed according to the invention is also to design the hollow cylindrical cartridge with a peg-shaped axial extension for fixing the other end of the compression coil spring to its bottom end face. The diameter of this axial extension corresponds approximately to the inside diameter of the spring turns of the compression coil spring and the length of the axial extension is in turn designed such that approximately two spring turns of the compression coil spring are supported radially on the axial extension. A cartridge designed in this way can also be produced as a stamped and drawn part from a sheet steel and has no cutting as well as the first-mentioned embodiment, axially in the axial extension, a vent hole opening into the cavity of the cartridge for discharging the hydraulic pressure medium accumulating behind the locking pin in the through hole.
Als weitere Ausgestaltung der erfindungsgemäß ausgebildeten Vorrichtung werden darüber hinaus nachfolgend beispielhaft mehrere Ausführungsformen zu Arretierung des Gegenhalters der Druckschraubenfeder des Verriegelungsstiftes in der Durchgangsbohrung im Flügelrad vorgeschlagen, die sich unter der Vielzahl denkbarer Arretierungsmöglichkeiten als am kostengünstigsten erwiesen haben.As a further embodiment of the device designed according to the invention, several embodiments for locking the counter-holder of the compression coil spring of the locking pin in the through hole in the impeller are also proposed by way of example, which have proven to be the most cost-effective among the large number of possible locking options.
Eine solche erste Ausführungsform zur Arretierung der hohlzylindrischen Patrone in der Durchgangsbohrung ist es beispielsweise, die Patrone an ihrer Mantelfläche mit einem geringfügig größeren Durchmesser als die Durchgangsbohrung in der Radnabe des Flügelrades auszubilden und kraftschlüssig durch Presssitz in dieser Durchgangsbohrung zu befestigen. Dabei wird die Patrone von der nockenwellenseitigen Bohrungsöffnung der Durchgangsbohrung aus soweit in diese hineingepresst, bis sie die durch einen hilfsweise in die Durchgangsbohrung eingesetzten Gegenanschlag definierte Position in der Durchgangsbohrung erreicht, in der die Druckschraubenfeder die erwünschte definierte Federkraft auf den Verriegelungsstift ausübt. Eine ebenfalls mögliche Realisierungsform, die Patrone durch Presssitz in der Durchgangsbohrung in der Radnabe des Flügelrades zu befestigen wäre es darüber hinaus, die Pat- rone in der Art eines Spannstiftes mit einem längsaxialen Schlitz in ihrer Mantelfläche sowie ohne Boden auszubilden und die derart ausgebildete Patrone durch Zusammenpressen des Schlitzes in die Durchgangsbohrung einzuführen. Das andere Ende der Druckschraubenfeder ist dabei derart ausgebildet, dass sich deren erste Federwindung auf der dann ringförmigen Bodenstimflä- ehe dieser Patrone abstützt.Such a first embodiment for locking the hollow cylindrical cartridge in the through bore is, for example, to design the cartridge on its outer surface with a slightly larger diameter than the through bore in the wheel hub of the impeller and to fix it in a force-fitting manner by press fit in this through bore. The cartridge is pressed into the through bore from the camshaft-side bore opening until it reaches the position in the through bore defined by an auxiliary stop, which is inserted into the through bore, in which the compression coil spring exerts the desired defined spring force on the locking pin. Another possible form of implementation to press-fit the cartridge into the through hole in the wheel hub of the impeller would also be to design the cartridge in the manner of a dowel pin with a longitudinal axial slot in its lateral surface and without a bottom, and to design the cartridge designed in this way Press the slot together into the through hole. The other end of the compression coil spring is designed such that its first spring turn is supported on the then annular bottom surface before this cartridge.
Alternativ zur ersten Ausführungsform wird es als zweite Ausführungsform der Arretierung der hohlzylindrischen Patrone in der Durchgangsbohrung vorgeschlagen, die hohlzylindrische Patrone an ihrer Mantelfläche mit einem gering- fügig kleineren Durchmesser als die Durchgangsbohrung in der Radnabe des Flügelrades auszubilden und formschlüssig durch Anlage ihres Abschlussrandes an einem in eine umlaufende Nut in der Durchgangsbohrung eingesetzten Sprengring in der Durchgangsbohrung zu befestigen. Bei dieser Ausführungs- form wird die Position der Patrone in der Durchgangsbohrung, in der die Druckschraubenfeder die erwünschte definierte Federkraft auf den Verriegelungsstift ausübt, unter Berücksichtigung der axialen Länge der Patrone durch die umlaufende Nut in der Durchgangsbohrung bestimmt.As an alternative to the first embodiment, it is proposed as a second embodiment of locking the hollow cylindrical cartridge in the through hole that the hollow cylindrical cartridge has a slight to form a smaller diameter than the through hole in the wheel hub of the impeller and to fix it positively by engaging its end edge on a circlip inserted in a circumferential groove in the through hole in the through hole. In this embodiment, the position of the cartridge in the through bore, in which the compression coil spring exerts the desired defined spring force on the locking pin, is determined by taking into account the axial length of the cartridge by the circumferential groove in the through bore.
Eine dritte Ausführungsform der Arretierung der hohlzylindrischen Patrone in der Durchgangsbohrung ist es schließlich noch, die hohlzylindrische Patrone ebenfalls mit einem geringfügig kleineren Durchmesser als die Durchgangsbohrung in der Radnabe des Flügelrades sowie mit mehreren offenen Axialschlitzen in ihrer Mantelfläche und einem nach außen abgewinkelten Ab- schlussrand auszubilden, mit welchen die Patrone formschlüssig durch Einklip- sen ihres Abschlussrandes in eine umlaufende Nut in der Durchgangsbohrung in selbiger befestigt wird. Die derart ausgebildete Patrone wird dabei ebenso wie die gemäß der zweiten Ausführungsform von der nockenwellenfernen Bohrungsöffnung der Durchgangsbohrung aus in diese eingeführt, wobei die Axial- schlitze in der Mantelfläche der Patrone ein Einfedern des abgewinkelten Abschlussrandes in die Durchgangsbohrung ermöglichen. Die Lage der Patrone in der Durchgangsbohrung, in der die Druckschraubenfeder die erwünschte definierte Federkraft auf den Verriegelungsstift ausübt, wird auch bei dieser Ausführungsform durch die Positionierung der umlaufenden Nut in der Durch- gangsbohrung unter Berücksichtigung der axialen Länge der Patrone bestimmt.Finally, a third embodiment of the locking of the hollow cylindrical cartridge in the through bore is to design the hollow cylindrical cartridge also with a slightly smaller diameter than the through bore in the wheel hub of the impeller and with several open axial slots in its outer surface and an end edge that is angled outwards with which the cartridge is positively attached by clipping its end edge into a circumferential groove in the through hole in the same. The cartridge designed in this way, like that in accordance with the second embodiment, is inserted into the through-bore from the bore opening remote from the camshaft, the axial slots in the outer surface of the cartridge allowing the angled end edge to deflect into the through-bore. The position of the cartridge in the through hole, in which the compression coil spring exerts the desired defined spring force on the locking pin, is also determined in this embodiment by the positioning of the circumferential groove in the through hole, taking into account the axial length of the cartridge.
Lediglich erwähnt werden soll noch, dass neben der Befestigung der hohlzylindrischen Patrone in der Durchgangsbohrung durch reinen Kraft- oder Form- schluss jedoch auch sogenannte Mischbefestigungsarten denkbar sind, bei denen die Patrone, beispielsweise durch Einkeilen in einer definierten Position in der Durchgangsbohrung, sowohl durch Kraftschluss als auch durch Form- schluss in der Durchgangsbohrung befestigt wird. Ebenso ist es möglich, die hohlzylindrische Patrone durch stoffschlüssige Verbindungen, wie sie zum Bei- spiel beim Schweißen, Löten und Kleben entstehen, in der Durchgangsbohrung in der Radnabe des Flügelrades zu befestigen. Darüber hinaus ist es auch denkbar, die Patrone nicht hohlzylindrisch sondern vollzylindrisch auszubilden und mit den genannten Möglichkeiten zur Fixierung des anderen Endes der Druckschraubenfeder auszustatten. Die Montage einer solchen vollzylindri- schen Patrone in der Durchgangsbohrung in der Radnabe des Flügelrades erfolgt dann durch Einpressen oder durch stoffschlüssige Verbindungen oder auch in der Art eines Kerbstiftes und die Entlüftung der Durchgangsbohrung kann durch eine oder mehrere zentrische oder exzentrische Axialbohrungen oder durch eine oder mehrere Axialnuten am Umfang der Patrone realisiert werden.It should only be mentioned that in addition to the fastening of the hollow cylindrical cartridge in the through hole by pure force or positive locking, so-called mixed fastening types are also conceivable, in which the cartridge, for example by wedging in a defined position in the through hole, both by frictional engagement as well as by positive locking in the through hole. It is also possible to connect the hollow cylindrical cartridge with integral connections, such as those used for play during welding, soldering and gluing, to be fixed in the through hole in the wheel hub of the impeller. In addition, it is also conceivable to design the cartridge not as a hollow cylinder but as a full cylinder and to provide it with the abovementioned options for fixing the other end of the compression coil spring. The assembly of such a fully cylindrical cartridge in the through hole in the wheel hub of the impeller is then carried out by pressing in or by material connections or also in the manner of a notch pin, and the through hole can be vented by one or more centric or eccentric axial holes or by one or more Axial grooves can be realized on the circumference of the cartridge.
Die erfindungsgemäß ausgebildete Vorrichtung zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine, insbesondere Rotati- onskolben-Verstelleinrichtung zur Drehwinkelverstellung einer Nockenwelle gegenüber einer Kurbelwelle, weist somit gegenüber den aus dem Stand der Technik bekannten Vorrichtungen den Vorteil auf, dass deren Verriegelungsmechanismus durch Ausbildung des Gegenhalters der Druckschraubenfeder des Verriegelungsstiftes als hohlzylindrische Patrone, die durch Kraft- oder Formschluss in der Durchgangsbohrung in der Radnabe des Flügelrades befestigt wird, ohne jegliche Anpassungsarbeiten nunmehr auch in Vorrichtung mit jeweils unterschiedlicher Breite des Flügelrades einsetzbar ist und dabei jederzeit die Einhaltung einer definierten, auf den Verriegelungsstift wirkenden Federkraft gewährleistet. Da die Fixierung des Gegenhalters für die Druck- schraubenfeder zudem nicht mehr an einer Seitenwand des Antriebsrades sondern innerhalb der Durchgangsbohrung in der Radnabe des Flügelrades erfolgt, haben die Schwenkbewegungen des Flügelrades auch keinen Einfluss mehr auf den Verriegelungsmechanismus, so dass der Gegenhalter der Druckschraubenfeder des Verriegelungsstiftes praktisch verschleißfrei ist. Kurze Beschreibung der ZeichnungThe device designed according to the invention for changing the control times of gas exchange valves of an internal combustion engine, in particular a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft, thus has the advantage over the devices known from the prior art that their locking mechanism is formed by forming the counterhold of the Compression coil spring of the locking pin as a hollow cylindrical cartridge, which is fastened in the through hole in the wheel hub of the impeller by a force or form fit, can now be used in any device with different widths of the impeller without any adjustment work, and at the same time compliance with a defined, on the locking pin acting spring force guaranteed. Since the counter-holder for the compression coil spring is no longer attached to a side wall of the drive wheel but within the through hole in the wheel hub of the impeller, the swivel movements of the impeller no longer have any influence on the locking mechanism, so that the counter-holder of the compression coil spring of the locking pin is practically wear-free. Brief description of the drawing
Die Erfindung wird nachfolgend anhand mehrerer Ausführungsbeispiele näher erläutert und ist in den dazugehörigen Zeichnungen schematisch dargestellt. Dabei zeigen:The invention is explained in more detail below using several exemplary embodiments and is shown schematically in the accompanying drawings. Show:
Figur 1 einen Längsschnitt durch eine erfindungsgemäße ausgebildete Vorrichtung; Figur 2 eine vergrößere Darstellung der Einzelheit Z nach Figur 1 mit einer ersten Ausführungsform der Fixierung der Druckschraubenfeder des Verriegelungsstiftes an deren Gegenhaltung und einer ersten Ausführungsform der Fixierung des Gegenhalters in der Durchgangsbohrung in der Radnabe des Flügelrades;1 shows a longitudinal section through a device designed according to the invention; Figure 2 is an enlarged view of the detail Z of Figure 1 with a first embodiment of the fixation of the compression coil spring of the locking pin on its counter support and a first embodiment of the fixation of the counter holder in the through hole in the wheel hub of the impeller;
Figur 3 eine vergrößerte Darstellung der Einzelheit Z nach Figur 1 mit einer zweiten Ausführungsform der Fixierung der Druckschraubenfeder des Verriegelungsstiftes an deren Gegenhalter und der ersten Ausführungsform der Fixierung des Gegenhalters in der Durchgangsbohrung in der Radnabe des Flügelrades;Figure 3 is an enlarged view of the detail Z of Figure 1 with a second embodiment of the fixing of the compression coil spring of the locking pin on its counter holder and the first embodiment of the fixing of the counter holder in the through hole in the wheel hub of the impeller;
Figur 4 eine vergrößerte Darstellung der Einzelheit Z nach Figur 1 mit der zweiten Ausführungsform der Fixierung der Druckschraubenfeder des Verriegelungsstiftes an deren Gegenhalter und einer zweiten Ausführungsform der Fixierung des Gegenhalters in der Durchgangsbohrung in der Radnabe des Flügelrades;Figure 4 is an enlarged view of the detail Z of Figure 1 with the second embodiment of the fixing of the compression coil spring of the locking pin on its counter-holder and a second embodiment of the fixing of the counter-holder in the through hole in the wheel hub of the impeller;
Figur 5 eine vergrößerte Darstellung der Einzelheit Z nach Figur 1 mit der zweiten Ausführungsform der Fixierung der Druckschrau- benfeder des Verriegelungsstiftes an deren Gegenhalter und einer dritten Ausführungsform der Fixierung des Gegenhalters in der Durchgangsbohrung in der Radnabe des Flügelrades. Ausführliche Beschreibung der Zeichnung5 shows an enlarged view of the detail Z according to FIG. 1 with the second embodiment of fixing the compression coil spring of the locking pin to its counter-holder and a third embodiment of fixing the counter-holder in the through hole in the wheel hub of the impeller. Detailed description of the drawing
Aus Figur 1 geht deutlich eine Vorrichtung 1 zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine hervor, die konkret als Ro- tationskolben-Verstelleinrichtung zur Drehwinkelverstellung einer Nockenwelle gegenüber einer Kurbelwelle ausgebildet und am antriebsseitigen Ende einer im Zylinderkopf der Brennkraftmaschine gelagerten, nicht näher dargestellten Nockenwelle befestigt ist. Diese Vorrichtung 1 ist im Prinzip als in Abhängigkeit von verschiedenen Betriebsparametern der Brennkraftmaschine steuerbarer hydraulischer Stellantrieb ausgebildet und besteht im Wesentlichen aus einem mit der Kurbelwelle der Brennkraftmaschine in Antriebsverbindung stehenden Antriebsrad 2 sowie aus einem drehfest mit der Nockenwelle der Brennkraftmaschine verbundenen Flügelrad 3. Das Antriebsrad 2 weist dabei, wie ebenfalls aus Figur 1 ersichtlich ist, einen durch eine hohlzylindrische Umfangswand 4 und zwei Seitenwände 5, 6 gebildeten Hohlraum auf, in dem durch mehrere radiale Begrenzungswände 7 mehrere hydraulische Arbeitsräume gebildet werden. Das Flügelrad 3 weist dementsprechend am Umfang seiner Radnabe 8 die gleiche Anzahl sich radial in einen Arbeitsraum des Antriebsrades erstreckende Flügel 9 auf, welche die Arbeitsräume in jeweils zwei gegeneinander wirkende hydraulische Druckkammern 10, 11 unterteilen, die bei wahlweiser oder gleichzeitiger Druckbeaufschlagung mit einem hydraulischen Druckmittel eine Schwenkbewegung oder Fixierung des Flügelrades 3 gegenüber dem Antriebsrad 2 und damit der Nockenwelle gegenüber der Kurbelwelle bewirken. Darüber hinaus ist in Figur 1 zu sehen, dass die Vorrichtung 1 ein gesondertes Verriegelungselement aufweist, mit dem das Flügelrad 3 bei Unterschreitung eines zur Verstellung erforderlichen Druckmitteldrucks in einer bevorzugten Basisposition innerhalb seines Verstellbereiches mit dem Antriebsrad 2 mechanisch koppelbar ist. Dieses Verriegelungselement ist deutlich sichtbar als zylindrischer Verriegelungsstift 12 ausgebildet, der durch ein Federelement in eine Verriegelungsstellung innerhalb einer Aufnahme 13 in der Seitenwand 5 des Antriebsrades 2 verschiebbar ist. Das Federelement ist dabei als Druckschraubenfeder 14 ausgebildet, die zusammen mit dem Verriegelungsstift 12 in einer zur Längsmittelachse der Vorrichtung 1 parallelen Durchgangsbohrung 15 in der Radnabe 8 des Flügelrades angeordnet ist und deren eines Ende 17 in einer axialen Grundbohrung 16 an der Rückseite des Verriegelungsstiftes 12 fixierbar ist. Das andere Ende 18 der Druckschraubenfeder 14 für den Verriegelungsstift 12 stützt sich dagegen an einem in der Durchgangsbohrung 15 angeordneten, ebenfalls in Figur 1 deutlich sichtbaren Gegenhalter ab, der erfindungsgemäß als durch Kraft- oder Formschluss in einer beliebigen Axialposition innerhalb der Durchgangsbohrung 15 in der Radnabe 8 des Flügelrades 3 arretierbare hohlzylindrische Patrone 19 ausgebildet ist.1 clearly shows a device 1 for changing the control times of gas exchange valves of an internal combustion engine, which is designed specifically as a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft and is fastened to the drive-side end of a camshaft, not shown, mounted in the cylinder head of the internal combustion engine is. In principle, this device 1 is designed as a hydraulic actuator which can be controlled as a function of various operating parameters of the internal combustion engine and essentially consists of a drive wheel 2 which is in drive connection with the crankshaft of the internal combustion engine and an impeller 3 which is non-rotatably connected to the camshaft of the internal combustion engine has, as can also be seen from FIG. 1, a cavity formed by a hollow cylindrical peripheral wall 4 and two side walls 5, 6, in which several hydraulic working spaces are formed by a plurality of radial boundary walls 7. Accordingly, the impeller 3 on the circumference of its wheel hub 8 has the same number of vanes 9 which extend radially into a working space of the drive wheel and which divide the working spaces into two hydraulic pressure chambers 10, 11 which act against one another and which, when selectively or simultaneously pressurized with a hydraulic pressure medium cause a pivoting movement or fixation of the impeller 3 with respect to the drive wheel 2 and thus the camshaft with respect to the crankshaft. In addition, it can be seen in FIG. 1 that the device 1 has a separate locking element with which the impeller 3 can be mechanically coupled to the drive wheel 2 in a preferred base position within its adjustment range when the pressure of the pressure medium required for adjustment is undershot. This locking element is clearly visible as a cylindrical locking pin 12 which can be moved by a spring element into a locking position within a receptacle 13 in the side wall 5 of the drive wheel 2. The spring element is designed as a compression coil spring 14, which together with the locking pin 12 in a through hole parallel to the longitudinal central axis of the device 1 15 is arranged in the wheel hub 8 of the impeller and one end 17 of which can be fixed in an axial basic bore 16 on the rear side of the locking pin 12. The other end 18 of the compression coil spring 14 for the locking pin 12, on the other hand, is supported on a counter-holder which is arranged in the through-bore 15 and is also clearly visible in FIG. 1 and which according to the invention as a force or form fit in any axial position within the through-bore 15 in the wheel hub 8 of the impeller 3 lockable hollow cylindrical cartridge 19 is formed.
Durch die in Figur 2 gezeigte vergrößerte Darstellung der Einzelheit Z nach Figur 1 wird dabei deutlich, dass die hohlzylindrische Patrone 19 als Stanzziehteil aus einem Stahlblech ausgebildet ist, welche zur Fixierung des anderen Endes 18 der Druckschraubenfeder 14 in ihrer Bodenstirnfläche 20 eine tellerförmige Axialvertiefung 21 aufweist, deren Durchmesser dem Außen- durchmesser der Federwindungen 22 der Druckschraubenfeder 14 entspricht. Alternativ dazu ist in Figur 3 dargestellt, dass die hohlzylindrische Patrone 19 auch als Stanzziehteil aus einem Stahlblech ausgebildet sein kann, welche zur Fixierung des anderen Endes 18 der Druckschraubenfeder 14 an ihrer Bodenstirnfläche 20 eine zapfenförmige Axialverlängerung 23 aufweist, deren Durchmesser dem Innendurchmesser der Federwindungen 22 der Druckschraubenfeder 14 entspricht.The enlarged representation of the detail Z according to FIG. 1 shown in FIG. 2 clearly shows that the hollow cylindrical cartridge 19 is designed as a stamped and drawn part made of sheet steel, which has a plate-shaped axial recess 21 in its bottom end face 20 for fixing the other end 18 of the compression coil spring 14 , whose diameter corresponds to the outside diameter of the spring windings 22 of the compression coil spring 14. As an alternative to this, it is shown in FIG. 3 that the hollow cylindrical cartridge 19 can also be designed as a stamped and drawn part made of sheet steel, which, in order to fix the other end 18 of the compression coil spring 14 to its bottom end face 20, has a peg-shaped axial extension 23 whose diameter corresponds to the inside diameter of the spring windings 22 corresponds to the compression coil spring 14.
Sowohl aus Figur 2 als auch aus Figur 3 ist darüber hinaus eine erste Ausführungsform der Fixierung des Gegenhalters in der Durchgangsbohrung 15 in der Radnabe 8 des Flügelrades 3 ersichtlich, die darin besteht, dass die hohlzylindrische Patrone 19 an ihrer Mantelfläche 24 einen geringfügig größeren Durch-messer als die Durchgangsbohrung 15 in der Radnabe 8 des Flügelrades 3 aufweist und kraftschlüssig durch Presssitz in dieser Durchgangsbohrung 15 befestigt ist.Both FIG. 2 and FIG. 3 also show a first embodiment of the fixing of the counter-holder in the through bore 15 in the wheel hub 8 of the impeller 3, which consists in the hollow cylindrical cartridge 19 having a slightly larger diameter on its outer surface 24. knife than the through hole 15 in the wheel hub 8 of the impeller 3 and is non-positively fixed by press fit in this through hole 15.
Die in Figur 4 zweite Ausführungsform der Fixierung des Gegenhalters in der Durchgangsbohrung 15 unterscheidet sich dagegen dadurch, dass die hohlzylindrische Patrone 19 an ihrer Mantelfläche 24' einen geringfügig kleineren Durchmesser als die Durchgangsbohrung 15 in der Radnabe 8 des Flügelrades 3 aufweist und formschlüssig durch Anlage ihres Abschlussrandes 25 an einem in eine umlaufende Nut 26 in der Durchgangsbohrung 15 eingesetzten Sprengring 27 in der Durchgangsbohrung 15 befestigt ist.The second embodiment of fixing the counter-holder in the through-bore 15 in FIG. 4 differs in that the hollow cylindrical cartridge 19 has a slightly smaller surface area 24 ′ Diameter than the through hole 15 in the wheel hub 8 of the impeller 3 and is positively attached by abutment of its end edge 25 to a snap ring 27 inserted into a circumferential groove 26 in the through hole 15 in the through hole 15.
Eine ebenfalls formschlüssige Fixierung des Gegenhalters in der Durchgangsbohrung 15 wird schließlich alternativ noch als dritte Ausführungsform in Figur 5 gezeigt. Bei dieser Ausführungsform weist die an ihrer Mantelfläche 24" e- benfalls mit einem geringfügig kleineren Durchmesser als die Durchgangsboh- rung 15 in der Radnabe 8 des Flügelrades 3 ausgebildete hohlzylindrische Patrone 19 mehrere offene Axialschlitze 28 in ihrer Mantelfläche 24" sowie einen nach außen abgewinkelten Abschlussrand 25' auf, mit welchen die Patrone 19 durch Einklipsen ihres Abschlussrandes 25' in eine umlaufende Nut 29 in der Durchgangsbohrung 15 in selbiger befestigt ist. A likewise form-fitting fixation of the counter-holder in the through hole 15 is finally shown alternatively as a third embodiment in FIG. 5. In this embodiment, the hollow cylindrical cartridge 19 formed on its lateral surface 24 ", likewise with a slightly smaller diameter than the through bore 15 in the wheel hub 8 of the impeller 3, has a plurality of open axial slots 28 in its lateral surface 24" as well as an outwardly angled end edge 25 'on, with which the cartridge 19 is fastened by clipping its end edge 25' into a circumferential groove 29 in the through hole 15 in the same.
BezugszahlenlisteLIST OF REFERENCE NUMBERS
Vorrichtung 17 ein EndeDevice 17 one end
Antriebsrad 18 anderes EndeDrive wheel 18 other end
Flügelrad 19 PatroneVane 19 cartridge
Umfangswand 20 BodenstirnflächeCircumferential wall 20 bottom end face
Seitenwand 21 AxialvertiefungSide wall 21 axial recess
Seitenwand 22 FederwindungenSide wall 22 spring coils
Begrenzungswand 23 AxialverlängerungBoundary wall 23 axial extension
Radnabe 24 MantelflächeWheel hub 24 outer surface
Flügel 24' MantelflächeWing 24 'lateral surface
Druckkammer 24" MantelflächePressure chamber 24 "outer surface
Druckkammer 25 AbschlussrandPressure chamber 25 closing edge
Verriegelungsstift 25' AbschlussrandLocking pin 25 'edge
Aufnahme 26 NutRecording 26 groove
Druckschraubenfeder 27 SprengringCompression coil spring 27 snap ring
Durchgangsbohrung 28 AxialschlitzeThrough hole 28 axial slots
Grundbohrung 29 Nut Blind hole 29 groove

Claims

Patentansprüche claims
Vorrichtung zum Verändern der Steuerzeiten von Gaswechselventilen einer Brennkraftmaschine, insbesondere Rotationskolben-Versteileinrichtung zur Drehwinkelverstellung einer Nockenwelle gegenüber einer Kurbelwelle, mit folgenden Merkmalen:Device for changing the timing of gas exchange valves of an internal combustion engine, in particular a rotary piston adjusting device for adjusting the angle of rotation of a camshaft relative to a crankshaft, with the following features:
» die Vorrichtung (1 ) ist am antriebsseitigen Ende einer im Zylinderkopf der Brennkraftmaschine gelagerten Nockenwelle befestigt und im Prinzip als in Abhängigkeit von verschiedenen Betriebsparametern der Brennkraftmaschine steuerbarer hydraulischer Stellantrieb ausgebildet, "The device (1) is fixed to the drive-side end of a shaft mounted in the cylinder head of the engine camshaft and is formed in dependence on various operating parameters of the internal combustion engine controllable hydraulic actuator, in principle, as,
» die Vorrichtung (1 ) besteht im Wesentlichen aus einem mit einer Kurbelwelle der Brennkraftmaschine in Antriebsverbindung stehendem Antriebsrad (2) und aus einem drehfest mit einer Nockenwelle der Brennkraftmaschine verbundenem Flügelrad (3),The device (1) essentially consists of a drive wheel (2) which is in drive connection with a crankshaft of the internal combustion engine and an impeller (3) which is non-rotatably connected to a camshaft of the internal combustion engine,
» das Antriebsrad (2) weist einen durch eine hohlzylindrische Umfangswand (4) und zwei Seitenwände (5, 6) gebildeten Hohlraum auf, in dem durch mindestens eine radiale Begrenzungswand (7) mindestens ein hydraulischer Arbeitsraum gebildet wird,The drive wheel (2) has a cavity formed by a hollow cylindrical peripheral wall (4) and two side walls (5, 6), in which at least one hydraulic working space is formed by at least one radial boundary wall (7),
■ das Flügelrad (3) weist am Umfang seiner Radnabe (8) mindestens einen sich radial in einen Arbeitsraum des Antriebsrades (2) erstreckenden Flügel (9) auf, der diesen in jeweils zwei gegeneinander wirkende hydraulische Druckkammern (10, 11 ) unterteilt,The impeller (3) has at least one wing (9) extending radially into a working space of the drive wheel (2) on the circumference of its wheel hub (8) and dividing the latter into two hydraulic pressure chambers (10, 11) acting against each other,
■ die Druckkammern (10, 11 ) bewirken bei wahlweiser oder gleichzeitiger Druckbeaufschlagung mit einem hydraulischen Druckmittel eine Schwenkbewegung oder Fixierung des Flügelrades (3) gegenüber dem Antriebsrad (2) und damit der Nockenwelle gegenüber der Kurbelwelle, ■ das Flügelrad (3) ist bei Unterschreitung eines zur Verstellung erforderlichen Druckmitteldrucks durch ein gesondertes Verriegelungselement in einer bevorzugten Basisposition innerhalb seines Verstellbereiches mit dem Antriebsrad (2) mechanisch koppelbar, ■ the pressure chambers (10, 11) cause at selective or simultaneous pressurization with a hydraulic pressure medium or fixing a pivoting movement of the impeller (3) relative to the drive wheel (2) and therefore of the camshaft relative to the crankshaft, ■ the vane wheel (3) falls below a required for adjusting pressure fluid pressure by a separate locking element in a preferred base position within its adjustment with the drive wheel (2) mechanically coupled,
■ das Verriegelungselement ist als zylindrischer Verriegelungsstift (12) ausgebildet, der durch ein Federelement in eine Verriegelungsstellung innerhalb einer Aufnahme (13) in einer der Seitenwände (5, 6) des An- triebsrades (2) verschiebbar ist, ■ the locking element is designed as a cylindrical locking pin (12) is formed, the drive wheel by a spring element into a locking position within a receptacle (13) in one of the side walls (5, 6) of the AN (2) is displaceable,
■ das Federelement ist als Druckschraubenfeder (14) ausgebildet und zusammen mit dem Verriegelungsstift (12) in einer zur Längsmittelachse der Vorrichtung (1) parallelen Durchgangsbohrung (15) in der Radnabe (8) des Flügelrades (3) angeordnet,The spring element is designed as a compression coil spring (14) and, together with the locking pin (12), is arranged in a through bore (15) in the wheel hub (8) of the impeller (3) parallel to the longitudinal center axis of the device (1),
■ ein Ende (17) der Druckschraubenfeder (14) ist in einer axialen Grundbohrung (16) an der Rückseite des Verriegelungsstiftes (12) fixierbar, während das andere Ende (18) der Druckschraubenfeder (14) sich an ei- nem in der Durchgangsbohrung (15) angeordneten Gegenhalter abstützt, ■ one end (17) of the compression coil spring (14) can be fixed in an axial base bore (16) on the rear side of the locking pin (12), while the other end (18) of the compression coil spring (14) is attached to one in the through bore ( 15) supports the arranged counter support,
dadurch gekennzeichnet, dasscharacterized in that
■ der Gegenhalter für das andere Ende (18) der Druckschraubenfeder (14) des Verriegelungsstiftes (12) als hohlzylindrische Patrone (19) ausgebildet ist, die durch Kraft- oder Formschluss in einer beliebigen Axialposition innerhalb der Durchgangsbohrung (15) in der Radnabe (8) des Flügelrades (3) arretierbar ist. ■ the counter-holder for the other end (18) of the compression coil spring (14) of the locking pin (12) is designed as a hollow cylindrical cartridge (19), which can be locked in any axial position within the through-bore (15) in the wheel hub (8) by force or positive locking ) of the impeller (3) can be locked.
Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die hohlzylindrische Patrone (19) als Stanzziehteil aus einem Stahlblech ausgebildet ist und zur Fixierung des anderen Endes (18) der Druckschraubenfeder (14) in ihrer Bodenstirnfläche (20) eine tellerförmige Axialvertiefung (21 ) aufweist, deren Durchmesser dem Außendurchmesser der Federwindungen (22) der Druckschraubenfeder (14) entspricht. Device according to claim 1, characterized in that the hollow cylindrical cartridge (19) is designed as a stamped and drawn part made of sheet steel and has a plate-shaped axial depression (21) in its bottom end face (20) for fixing the other end (18) of the compression coil spring (14), whose diameter corresponds to the outer diameter of the spring windings (22) of the compression coil spring (14).
3. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, dass die hohlzylindrische Patrone (19) als Stanzziehteil aus einem Stahlblech ausgebildet ist und zur Fixierung des anderen Endes (18) der Druckschraubenfeder (14) an ihrer Bodenstirnfläche (20) eine zapfenförmige Axialverlängerung (23) aufweist, deren Durchmesser dem Innendurchmesser der Federwindungen (22) der Druckschraubenfeder (14) entspricht.3. Device according to claim 1, characterized in that the hollow cylindrical cartridge (19) is designed as a stamped and drawn part made of sheet steel and for fixing the other end (18) of the compression coil spring (14) on its bottom end face (20) a peg-shaped axial extension (23) has, whose diameter corresponds to the inner diameter of the spring windings (22) of the compression coil spring (14).
4. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die hohlzylindrische Patrone (19) an ihrer Mantelfläche (24) einen geringfügig größeren Durchmesser als die Durchgangsbohrung (15) in der Radnabe (8) des Flügelrades (3) aufweist und kraftschlüssig durch Presssitz in dieser Durchgangsbohrung (15) befestigt ist.4. The device according to claim 2 or 3, characterized in that the hollow cylindrical cartridge (19) on its outer surface (24) has a slightly larger diameter than the through hole (15) in the wheel hub (8) of the impeller (3) and non-positively through Press fit in this through hole (15) is attached.
5. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die hohlzylindrische Patrone (19) an ihrer Mantelfläche (24') einen geringfügig kleineren Durchmesser als die Durchgangsbohrung (15) in der Radnabe (8) des Flügelrades (3) aufweist und formschlüssig durch Anlage ihres Abschlussrandes (25) an einem in eine umlaufende Nut (26) in der Durch- gangsbohrung (15) eingesetzten Sprengring (27) in der Durchgangsbohrung (15) befestigt ist.5. The device according to claim 2 or 3, characterized in that the hollow cylindrical cartridge (19) on its lateral surface (24 ') has a slightly smaller diameter than the through hole (15) in the wheel hub (8) of the impeller (3) and positively is secured by a snap ring (27) inserted in a circumferential groove (26) in the through hole (15) in the through hole (15) by contact of its end edge (25).
6. Vorrichtung nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass die hohlzylindrische Patrone (19) an ihrer Mantelfläche (24") einen geringfügig kleineren Durchmesser als die Durchgangsbohrung (15) in der Radnabe (8) des Flügelrades (3) aufweist sowie mit mehreren offenen Axialschlitzen (28) in ihrer Mantelfläche (24") und einem nach außen abgewinkelten Abschlussrand (25') ausgebildet ist, mit welchem die Patrone (19) formschlüssig durch Einklipsen ihres Abschlussrandes (25') in eine umlaufende Nut (29) in der Durchgangsbohrung (15) in selbiger befestigt ist. 6. The device according to claim 2 or 3, characterized in that the hollow cylindrical cartridge (19) on its lateral surface (24 ") has a slightly smaller diameter than the through hole (15) in the wheel hub (8) of the impeller (3) and with a plurality of open axial slots (28) is formed in its lateral surface (24 ") and an outwardly angled end edge (25 ') with which the cartridge (19) is positively locked by clipping its end edge (25') into a circumferential groove (29) in the through hole (15) is fastened in the same.
EP04734221A 2003-07-19 2004-05-21 Device for altering the control times of gas exchange valves in an internal combustion engine, in particular a rotating piston adjustment device for the rotation angle adjustment of a camshaft relative to a crankshaft Expired - Lifetime EP1646769B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003132881 DE10332881A1 (en) 2003-07-19 2003-07-19 Valve timing adjustment device for IC engine, uses rotary piston hydraulic setting mechanism for adjusting camshaft angle relative to crankshaft
PCT/EP2004/005447 WO2005019611A1 (en) 2003-07-19 2004-05-21 Device for altering the control times of gas exchange valves in an internal combustion engine, in particular a rotating piston adjustment device for the rotation angle adjustment of a camshaft relative to a crankshaft

Publications (2)

Publication Number Publication Date
EP1646769A1 true EP1646769A1 (en) 2006-04-19
EP1646769B1 EP1646769B1 (en) 2010-08-18

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EP04734221A Expired - Lifetime EP1646769B1 (en) 2003-07-19 2004-05-21 Device for altering the control times of gas exchange valves in an internal combustion engine, in particular a rotating piston adjustment device for the rotation angle adjustment of a camshaft relative to a crankshaft

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EP (1) EP1646769B1 (en)
DE (2) DE10332881A1 (en)
WO (1) WO2005019611A1 (en)

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DE502004011559D1 (en) 2010-09-30
EP1646769B1 (en) 2010-08-18
WO2005019611A1 (en) 2005-03-03
DE10332881A1 (en) 2005-02-10

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