EP2459851A1 - Volume store - Google Patents

Volume store

Info

Publication number
EP2459851A1
EP2459851A1 EP10728202A EP10728202A EP2459851A1 EP 2459851 A1 EP2459851 A1 EP 2459851A1 EP 10728202 A EP10728202 A EP 10728202A EP 10728202 A EP10728202 A EP 10728202A EP 2459851 A1 EP2459851 A1 EP 2459851A1
Authority
EP
European Patent Office
Prior art keywords
housing
camshaft
cavity
volume
volume memory
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
EP10728202A
Other languages
German (de)
French (fr)
Other versions
EP2459851B1 (en
Inventor
Mathias Boegershausen
Michael Busse
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 EP2459851A1 publication Critical patent/EP2459851A1/en
Application granted granted Critical
Publication of EP2459851B1 publication Critical patent/EP2459851B1/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
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/027—Installations or systems with accumulators having accumulator charging devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/02—Installations or systems with accumulators
    • F15B1/04—Accumulators
    • F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
    • F15B1/24—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with rigid separating means, e.g. pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L2001/0475—Hollow camshafts
    • 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
    • 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
    • F01L2303/00—Manufacturing of components used in valve arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/20—Accumulator cushioning means
    • F15B2201/21—Accumulator cushioning means using springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2201/00—Accumulators
    • F15B2201/40—Constructional details of accumulators not otherwise provided for
    • F15B2201/405—Housings
    • F15B2201/4056—Housings characterised by the attachment of housing components
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S303/00—Fluid-pressure and analogous brake systems
    • Y10S303/11—Accumulator

Definitions

  • the invention relates to a volume accumulator having a substantially hollow-cylindrical housing and a separating element disposed displaceably within the housing, the housing being arranged immovably within a cavity of a camshaft.
  • Volume accumulators are used in internal combustion engines to be able to serve short-term consumption peaks of hydraulic fluid.
  • An application is, for example, in the field of camshaft adjustment, by which a phase angle between a crankshaft and a camshaft is variable designable.
  • the camshaft adjuster is integrated into a drive train via which torque is transmitted from the crankshaft to the camshaft.
  • the phase adjustment is usually carried out by means of a hydraulic Stellan- drive, which is fed by a pressure medium pump of the internal combustion engine with pressure medium. If fast phase adjustments over a large phase angle are requested during operation of the internal combustion engine, the required pressure medium volume may exceed the pressure medium volume delivered by the pressure medium pump. In this case, the difference is provided from the volume memory.
  • the volume accumulator supports the camshaft adjustment in operating phases in which the speed-dependent delivery volume of the pressure medium pump is too low to supply the camshaft adjuster sufficient. This is usually at low Speeds and high pressure medium temperatures of the case.
  • volume accumulator supports the camshaft adjuster upon reaching a base position during the shutdown of the internal combustion engine.
  • a volume accumulator for supporting a camshaft adjuster is known, for example, from DE 102 28 354 A1.
  • the volume accumulator is arranged in a cavity of a camshaft, wherein a piston is arranged axially displaceable against a gas spring within the cavity.
  • the pressure medium supply to the camshaft adjuster and the volume accumulator via a common inlet via a camshaft bearing.
  • the volume accumulator is filled in operating phases of low pressure medium consumption. This stored in the volume accumulator pressure fluid volume is the camshaft adjuster in operating phases with higher pressure medium consumption available.
  • a check valve is usually provided upstream of the camshaft bearing. This is disclosed, for example, in DE 10 2007 056 683 A1, in which the mode of operation of a vane-type camshaft adjuster is also explained.
  • the invention has for its object to provide a arranged in a cavity of a camshaft volume storage, the cost and the production cost to be reduced.
  • the object is achieved in that the axial ends of the volume accumulator abut a respective conical contact surface, which are arranged within the cavity.
  • the separating element for example an axially displaceable piston, is arranged inside the housing, wherein an inner lateral surface of the housing serves as a running surface for the piston.
  • the high demands on the accuracy of the tread can be met in the housing without additional effort, for example by a chipless forming process, such as a deep drawing process.
  • the invention proposes to fix the housing of a volume accumulator, which is arranged within a hollow space of a camshaft, immovably between two conical abutment surfaces. Due to the conical contact surfaces, the housing is arranged centrally to the camshaft axis, wherein the centering takes place automatically during assembly of the volume memory. It is provided that an inner diameter of the cavity of the camshaft is formed larger than an outer diameter of the housing. Thus, the housing is not applied to the lateral surface of the cavity. Thus, there is no risk that the housing is deformed by bumps on the lateral surface of the camshaft, which could lead to jamming of the separating element.
  • the piston runs along a cost-effectively produced, highly accurate surface of the housing and on the other hand, the housing has no points of contact with the lateral surface of the cavity of the camshaft, can be dispensed with a costly reworking of the lateral surface.
  • one of the conical contact surfaces is formed on a lateral surface of the cavity.
  • at least one of the conical bearing surfaces is formed on a separate component which is fixedly secured to the camshaft, and thus immovably to this.
  • one of the conical bearing surfaces on which an axial end of the housing rests are formed directly on a lateral surface of the cavity of the camshaft, while the other axial end of the housing rests against a conical contact surface of a separate component.
  • both ends separate component is present.
  • both ends of the housing may rest against conical abutment surfaces of a separate component.
  • the separate component which has the conical contact surface
  • the housing is clamped in the axial direction between two camshaft-fixed components, wherein the conical contact surfaces center the housing during assembly and prevent radial movement of the housing.
  • the connection between the separate component and the camshaft can be produced, for example, by means of an interference fit, a welding or soldering connection.
  • the conical contact surface may be formed on an outer circumferential surface of the separate component, engages in the housing. Alternatively it can be provided that the conical contact surface is formed on an inner circumferential surface of the separate component, in which engages the housing.
  • FIG. 1 shows a longitudinal section through a first embodiment according to the invention of a volume accumulator within a camshaft
  • FIG. 2 shows an enlarged illustration of the detail X from FIG. 1
  • FIG. 3 shows an enlarged representation of the detail Z from FIG. 1
  • FIG. 4 shows a partial longitudinal section through a second embodiment according to the invention of a volume accumulator within a camshaft. Detailed description of the drawings
  • FIG. 1 shows a volume accumulator 1, which is arranged within a cavity 2 of a camshaft 3.
  • the volume memory 1 has a housing 4, a separating element 5, which is designed as a piston 5, and a spring element 6.
  • the piston 5 is formed as a thin-walled, cup-shaped sheet metal component and mounted axially displaceable within the housing 4. In this case, the piston 5 separates the interior of the housing 4 into a storage space 7 and a complementary space 8.
  • the housing 4 is substantially hollow cylindrical, each having an opening 9 formed on each axial end face, wherein the housing 4 at its axial ends 1 1 extends radially inward.
  • the spring element 6 is arranged, which on the one hand on the side facing away from the reservoir 7 of the piston 5 and on the other hand on the radially inwardly extending portion of the housing 4 is supported.
  • pressure medium is supplied via a pressure medium line 10 and the reservoir-side opening 9 to the reservoir 7 and thus the piston 5 is displaced against the force of the spring element 6.
  • the volume of the storage space 7 increases at the expense of the volume of the complementary space 8. If the pressure medium volume required by a consumer, for example a camshaft adjuster, exceeds the pressure medium volume delivered by a pressure medium pump, the piston 5 is displaced in the opposite direction due to the force exerted by the spring element 6 and pressure medium is supplied from the reservoir 7 to the pressure medium line 10 ,
  • the axial ends 1 1 of the housing 4 are in each case on a conical contact surface 12 ( Figures 2 and 3), whereby the housing 4 is centered to the longitudinal axis of the cavity 2. Since the outer diameter of the substantially hollow cylindrical housing 4 is formed smaller than the inner diameter of the lateral surface of the cavity 2 of the camshaft 3, the housing 4 is located at no point on the lateral surface of the cavity 2. Thus, there is no risk that the housing 4 is deformed during positioning in the cavity 2 by bumps on the lateral surface. There- by ensuring that the piston 5 is not jammed inside the housing 4, but is easily displaced. Thus, a costly and time-consuming machining post-processing of the lateral surface of the cavity 2 of the camshaft 3.
  • the inner surface of the housing 4 can be produced cost-neutral by appropriate manufacturing processes the requirements that are placed on an optimal running surface for the piston 5.
  • non-cutting production methods can be used, for example deep-drawing process, are automatically generated by the surfaces of appropriate quality.
  • the reservoir-side end of the housing 4 rests against a rotationally symmetrical, conical abutment surface 12, which is formed directly on the lateral surface of the cavity 2 of the camshaft 3 (FIG. 2).
  • the conical contact surface 12 is formed on an inner circumferential surface of the cavity 2 and the axial end 1 1 of the housing 4 engages in the region of the inner cone.
  • the other axial end 1 1 of the housing 4 is located on a conical contact surface 12 of a component 13, which was made separately from the volume memory 1 and the camshaft 3 and was subsequently connected by means of a press fit with the inner circumferential surface of the cavity 2 of the camshaft 3 (FIG 3).
  • the conical bearing surface 12 is formed on an inner circumferential surface of the component 13 and the axial end 1 1 of the housing 4 engages in the region of the inner cone.
  • the component 13 has a central passage opening 14, via which the complementary space 8 communicates with the interior of the internal combustion engine. Thus, the complementary space 8 can be vented and escape pressure medium from this.
  • FIG. 4 shows a partial longitudinal section through a second volume accumulator 1 according to the invention, which is arranged in a cavity 2 of a camshaft 3. Only the area of the complementary space 8 is shown here.
  • a guide element 15 is additionally provided, which supports the spring element 6 radially and on which the spring element 6 is axially supported.
  • the guide element 15 has axial dis- venting channels 16 which communicate with the through-hole 14 and the space in which the spring element 6 is received.
  • the conical contact surface 12 of the separate component 13 is formed on an outer circumferential surface of the component 13, wherein the outer cone formed thereby engages in the housing 4.
  • the guide element 15 which engages behind the housing in the direction of the conical contact surface 12, rests against the conical contact surface 12.
  • the guide element 15 rests against the conical bearing surface 12 and the housing 4 against the guide element 15, as a result of which it is fixed centrally within the camshaft 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention relates to a volume store (1) having a substantially hollow cylindrical housing (4) and a separating element (5) displaceably disposed within the housing (4), wherein the housing (4) is fixedly disposed within a hollow chamber (2) of a camshaft (3).

Description

Bezeichnung der Erfindung  Name of the invention
Volumenspeicher Beschreibung Volume memory description
Gebiet der Erfindung Die Erfindung betrifft einen Volumenspeicher mit einem im Wesentlichen hohlzylindrisch ausgebildeten Gehäuse und einem innerhalb des Gehäuses verlagerbar angeordneten Trennelement, wobei das Gehäuse unverschiebbar innerhalb eines Hohlraums einer Nockenwelle angeordnet ist. Hintergrund der Erfindung FIELD OF THE INVENTION The invention relates to a volume accumulator having a substantially hollow-cylindrical housing and a separating element disposed displaceably within the housing, the housing being arranged immovably within a cavity of a camshaft. Background of the invention
Volumenspeicher finden in Brennkraftmaschinen Einsatz um kurzzeitige Verbrauchspitzen von Hydraulikmittel bedienen zu können. Ein Einsatzgebiet liegt beispielsweise im Bereich der Nockenwellenverstellung, durch die eine Phasenlage zwischen einer Kurbelwelle und einer Nockenwelle variabel gestaltbar ist. Volume accumulators are used in internal combustion engines to be able to serve short-term consumption peaks of hydraulic fluid. An application is, for example, in the field of camshaft adjustment, by which a phase angle between a crankshaft and a camshaft is variable designable.
Der Nockenwellenversteller ist in einen Antriebsstrang integriert, über welchen Drehmoment von der Kurbelwelle auf die Nockenwelle übertragen wird. Die Phasenverstellung erfolgt üblicherweise mittels eines hydraulischen Stellan- triebs, der von einer Druckmittelpumpe der Brennkraftmaschine mit Druckmittel gespeist wird. Werden während des Betriebs der Brennkraftmaschine schnelle Phasenverstellungen über einen großen Phasenwinkel angefordert, kann das benötigte Druckmittelvolumen das von der Druckmittelpumpe geförderte Druckmittelvolumen übersteigen. In diesem Fall wird die Differenz aus dem Volumenspeicher bereitgestellt. Des Weiteren unterstützt der Volumenspeicher die Nockenwellenverstellung in Betriebsphasen, in denen das drehzahlabhängige Fördervolumen der Druckmittelpumpe zu gering ist, um den Nockenwellenversteller ausreichend zu versorgen. Dies ist üblicherweise bei geringen Drehzahlen und hohen Druckmitteltemperaturen der Fall. Darüber hinaus unterstützt der Volumenspeicher den Nockenwellenversteller beim Erreichen einer Basisposition während des Abstellvorgangs der Brennkraftmaschine. Ein Volumenspeicher, zur Unterstützung eines Nockenwellenverstellers ist beispielsweise aus der DE 102 28 354 A1 bekannt. Der Volumenspeicher ist in einem Hohlraum einer Nockenwelle angeordnet, wobei innerhalb des Hohlraums ein Kolben gegen eine Gasfeder axial verschiebbar angeordnet ist. Die Druckmittelzufuhr zu dem Nockenwellenversteller und dem Volumenspeicher erfolgt über einen gemeinsamen Zulauf über ein Nockenwellenlager. Während des Betriebs der Brennkraftmaschine wird der Volumenspeicher in Betriebsphasen geringen Druckmittelverbrauchs befüllt. Dieses in dem Volumenspeicher gespeicherte Druckmittelvolumen steht dem Nockenwellenversteller in Betriebsphasen mit höherem Druckmittelverbrauch zur Verfügung. Um zu ver- hindern, dass Druckmittel aus dem Volumenspeicher in Richtung der Druckmittelpumpe abfließt, ist üblicherweise ein Rückschlagventil stromaufwärts des Nockenwellenlagers vorgesehen. Dies ist beispielsweise in der DE 10 2007 056 683 A1 offenbart, in der auch die Funktionsweise eines Nockenwellenverstellers in Flügelzellenbauart erläutert ist. The camshaft adjuster is integrated into a drive train via which torque is transmitted from the crankshaft to the camshaft. The phase adjustment is usually carried out by means of a hydraulic Stellan- drive, which is fed by a pressure medium pump of the internal combustion engine with pressure medium. If fast phase adjustments over a large phase angle are requested during operation of the internal combustion engine, the required pressure medium volume may exceed the pressure medium volume delivered by the pressure medium pump. In this case, the difference is provided from the volume memory. Furthermore, the volume accumulator supports the camshaft adjustment in operating phases in which the speed-dependent delivery volume of the pressure medium pump is too low to supply the camshaft adjuster sufficient. This is usually at low Speeds and high pressure medium temperatures of the case. In addition, the volume accumulator supports the camshaft adjuster upon reaching a base position during the shutdown of the internal combustion engine. A volume accumulator for supporting a camshaft adjuster is known, for example, from DE 102 28 354 A1. The volume accumulator is arranged in a cavity of a camshaft, wherein a piston is arranged axially displaceable against a gas spring within the cavity. The pressure medium supply to the camshaft adjuster and the volume accumulator via a common inlet via a camshaft bearing. During operation of the internal combustion engine, the volume accumulator is filled in operating phases of low pressure medium consumption. This stored in the volume accumulator pressure fluid volume is the camshaft adjuster in operating phases with higher pressure medium consumption available. In order to prevent pressure fluid from flowing out of the volume accumulator in the direction of the pressure medium pump, a check valve is usually provided upstream of the camshaft bearing. This is disclosed, for example, in DE 10 2007 056 683 A1, in which the mode of operation of a vane-type camshaft adjuster is also explained.
Aufgabe der Erfindung Object of the invention
Der Erfindung liegt die Aufgabe zugrunde einen in einem Hohlraum einer Nockenwelle angeordneten Volumenspeicher anzugeben, wobei die Kosten und der Herstellungsaufwand verringert werden sollen. The invention has for its object to provide a arranged in a cavity of a camshaft volume storage, the cost and the production cost to be reduced.
Zusammenfassung der Erfindung Summary of the invention
Die Aufgabe wird erfindungsgemäß dadurch gelöst, dass die axialen Enden des Volumenspeichers an jeweils einer konischen Anlagefläche anliegen, die innerhalb des Hohlraums angeordnet sind. Dabei kann beispielsweise das Gehäuse oder ein mit dem Gehäuse verbundenes oder dieses in Richtung der konischen Anlagefläche hintergreifendes Zwischenbauteil an der konischen Anlagefläche anliegen. The object is achieved in that the axial ends of the volume accumulator abut a respective conical contact surface, which are arranged within the cavity. In this case, for example, the housing or connected to the housing or this in the direction of abut conical contact surface engaging intermediate component on the conical contact surface.
Das Trennelement, beispielsweise ein axialverschiebbarer Kolben, ist innerhalb des Gehäuses angeordnet, wobei eine Innenmantelfläche des Gehäuses dem Kolben als Lauffläche dient. Die hohen Anforderungen an die Genauigkeit der Lauffläche können in dem Gehäuse ohne Mehraufwand, beispielsweise durch ein spanloses Formgebungsverfahren, beispielsweise ein Tiefziehverfahren, erfüllt werden.  The separating element, for example an axially displaceable piston, is arranged inside the housing, wherein an inner lateral surface of the housing serves as a running surface for the piston. The high demands on the accuracy of the tread can be met in the housing without additional effort, for example by a chipless forming process, such as a deep drawing process.
Die Erfindung schlägt erstmals vor das Gehäuse eines innerhalb eines Hohl- raums einer Nockenwelle angeordneten Volumenspeichers unverschiebbar zwischen zwei konischen Anlageflächen zu fixieren. Durch die konischen Anlageflächen ist das Gehäuse zentrisch zur Nockenwelleachse angeordnet, wobei die Zentrierung während der Montage des Volumenspeichers selbsttätig erfolgt. Dabei ist vorgesehen, dass ein Innendurchmesser des Hohlraums der Nockenwelle größer als ein Außendurchmesser des Gehäuses ausgebildet ist. Somit liegt das Gehäuse nicht an der Mantelfläche des Hohlraums an. Somit besteht nicht die Gefahr, dass das Gehäuse durch Unebenheiten an der Mantelfläche der Nockenwelle deformiert wird, was zu einem Verklemmen des Trennelements führen könnte.  For the first time, the invention proposes to fix the housing of a volume accumulator, which is arranged within a hollow space of a camshaft, immovably between two conical abutment surfaces. Due to the conical contact surfaces, the housing is arranged centrally to the camshaft axis, wherein the centering takes place automatically during assembly of the volume memory. It is provided that an inner diameter of the cavity of the camshaft is formed larger than an outer diameter of the housing. Thus, the housing is not applied to the lateral surface of the cavity. Thus, there is no risk that the housing is deformed by bumps on the lateral surface of the camshaft, which could lead to jamming of the separating element.
Da einerseits der Kolben entlang einer kostenneutral hergestellten, hochgenauen Fläche des Gehäuses läuft und andererseits das Gehäuse keine Berührungspunkte mit der Mantelfläche des Hohlraums der Nockenwelle aufweist, kann auf eine kostenintensive Nachbearbeitung der Mantelfläche verzichtet werden. Since, on the one hand, the piston runs along a cost-effectively produced, highly accurate surface of the housing and on the other hand, the housing has no points of contact with the lateral surface of the cavity of the camshaft, can be dispensed with a costly reworking of the lateral surface.
Dabei kann vorgesehen sein, dass eine der konischen Anlageflächen an einer Mantelfläche des Hohlraums ausgebildet ist. Alternativ kann vorgesehen sein, dass zumindest eine der konischen Anlageflächen an einem separaten Bauteil ausgebildet ist, das fest an der Nockenwelle, und somit unverrückbar zu dieser, befestigt ist. Dabei sind Ausführungsformen vorstellbar, in denen eine der ko- nischen Anlageflächen, an der ein axiales Ende des Gehäuses anliegt, direkt an einer Mantelfläche des Hohlraums der Nockenwelle ausgebildet sind, während das andere axiale Ende des Gehäuses an einer konischen Anlagefläche eines separaten Bauteils anliegt. Alternativ können beide Enden separaten Bauteils anliegt. Alternativ können beide Enden des Gehäuses an konischen Anlageflächen eines separaten Bauteils anliegen. It can be provided that one of the conical contact surfaces is formed on a lateral surface of the cavity. Alternatively it can be provided that at least one of the conical bearing surfaces is formed on a separate component which is fixedly secured to the camshaft, and thus immovably to this. In this case, embodiments are conceivable in which one of the conical bearing surfaces on which an axial end of the housing rests, are formed directly on a lateral surface of the cavity of the camshaft, while the other axial end of the housing rests against a conical contact surface of a separate component. Alternatively, both ends separate component is present. Alternatively, both ends of the housing may rest against conical abutment surfaces of a separate component.
Das separate Bauteil, welches die konische Anlagefläche aufweist, kann kraft-, stoff- oder formschlüssig mit der Nockenwelle, beispielsweise der Mantelfläche des Hohlraums der Nockenwelle, verbunden sein. Somit wird das Gehäuse in axialer Richtung zwischen zwei nockenwellenfesten Bauteilen geklemmt, wobei die konischen Anlageflächen das Gehäuse während der Montage zentrieren und eine radiale Bewegung des Gehäuses unterbinden. Dabei kann die Verbindung zwischen dem separatem Bauteil und der Nockenwelle beispielsweise mittels eines Presssitzes, einer Schweiß- oder Lötverbindung hergestellt sein. Die konische Anlagefläche kann an einer Außenmantelfläche des separaten Bauteils ausgebildet sein, in das Gehäuse eingreift. Alternativ kann vorgesehen sein, dass die konische Anlagefläche an einer Innenmantelfläche des separaten Bauteils ausgebildet ist, in das das Gehäuse eingreift. The separate component, which has the conical contact surface, can be non-positively, material or positively connected to the camshaft, for example, the lateral surface of the cavity of the camshaft, connected. Thus, the housing is clamped in the axial direction between two camshaft-fixed components, wherein the conical contact surfaces center the housing during assembly and prevent radial movement of the housing. In this case, the connection between the separate component and the camshaft can be produced, for example, by means of an interference fit, a welding or soldering connection. The conical contact surface may be formed on an outer circumferential surface of the separate component, engages in the housing. Alternatively it can be provided that the conical contact surface is formed on an inner circumferential surface of the separate component, in which engages the housing.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Weitere Merkmale der Erfindung ergeben sich aus der nachfolgenden Be Schreibung und aus den Zeichnungen in denen Ausführungsbeispiele der Er findung vereinfacht dargestellt sind. Es zeigen: Further features of the invention will become apparent from the following Be spelling and from the drawings in which embodiments of the invention, He simplified. Show it:
Figur 1 einen Längsschnitt durch eine erste erfindungsgemäße Ausführungsform eines Volumenspeichers innerhalb einer Nockenwelle, Figur 2 eine vergrößerte Darstellung der Einzelheit X aus Figur 1 1 shows a longitudinal section through a first embodiment according to the invention of a volume accumulator within a camshaft, FIG. 2 shows an enlarged illustration of the detail X from FIG. 1
Figur 3 eine vergrößerte Darstellung der Einzelheit Z aus Figur 1 FIG. 3 shows an enlarged representation of the detail Z from FIG. 1
Figur 4 einen Teillängsschnitt durch eine zweite erfindungsgemäße Ausführungsform eines Volumenspeichers innerhalb einer Nockenwelle. Ausführliche Beschreibung der Zeichnungen FIG. 4 shows a partial longitudinal section through a second embodiment according to the invention of a volume accumulator within a camshaft. Detailed description of the drawings
Figur 1 zeigt einen Volumenspeicher 1 , der innerhalb eines Hohlraums 2 einer Nockenwelle 3 angeordnet ist. Der Volumenspeicher 1 weist ein Gehäuse 4, ein Trennelement 5, welches als Kolben 5 ausgebildet ist, und ein Federelement 6 auf. Der Kolben 5 ist als dünnwandiges, topfförmiges Blechbauteil ausgebildet und innerhalb des Gehäuses 4 axialverschiebbar gelagert. Dabei trennt der Kolben 5 das Innere des Gehäuses 4 in einen Vorratsraum 7 und einen Komplementärraum 8. Das Gehäuse 4 ist im Wesentlichen hohlzylind- risch mit jeweils einer Öffnung 9 an jeder axialen Stirnseite ausgebildet, wobei sich das Gehäuse 4 an dessen axialen Enden 1 1 radial nach innen erstreckt. In dem Komplementärraum 8 ist das Federelement 6 angeordnet, welches sich einerseits an der dem Vorratsraum 7 abgewandten Seite des Kolbens 5 und andererseits an dem sich radial nach innen erstreckenden Bereich des Gehäu- ses 4 abstützt. FIG. 1 shows a volume accumulator 1, which is arranged within a cavity 2 of a camshaft 3. The volume memory 1 has a housing 4, a separating element 5, which is designed as a piston 5, and a spring element 6. The piston 5 is formed as a thin-walled, cup-shaped sheet metal component and mounted axially displaceable within the housing 4. In this case, the piston 5 separates the interior of the housing 4 into a storage space 7 and a complementary space 8. The housing 4 is substantially hollow cylindrical, each having an opening 9 formed on each axial end face, wherein the housing 4 at its axial ends 1 1 extends radially inward. In the complementary space 8, the spring element 6 is arranged, which on the one hand on the side facing away from the reservoir 7 of the piston 5 and on the other hand on the radially inwardly extending portion of the housing 4 is supported.
Während des Betriebs der Brennkraftmaschine wird über eine Druckmittelleitung 10 und die vorratsraumseitige Öffnung 9 dem Vorratsraum 7 Druckmittel zugeführt und somit der Kolben 5 gegen die Kraft des Federelements 6 verschoben. Dabei nimmt das Volumen des Vorratsraums 7 auf Kosten des Volu- mens des Komplementärraums 8 zu. Übersteigt das von einem Verbraucher, beispielsweise einem Nockenwellenversteller, benötigte Druckmittelvolumen das von einer Druckmittelpumpe geförderte Druckmittelvolumen, wird der Kolben 5 auf Grund der von dem Federelement 6 auf diesen ausgeübten Kraft in die entgegengesetzte Richtung verschoben und somit der Druckmittelleitung 10 Druckmittel aus dem Vorratsraum 7 zugeführt.  During operation of the internal combustion engine 7 pressure medium is supplied via a pressure medium line 10 and the reservoir-side opening 9 to the reservoir 7 and thus the piston 5 is displaced against the force of the spring element 6. The volume of the storage space 7 increases at the expense of the volume of the complementary space 8. If the pressure medium volume required by a consumer, for example a camshaft adjuster, exceeds the pressure medium volume delivered by a pressure medium pump, the piston 5 is displaced in the opposite direction due to the force exerted by the spring element 6 and pressure medium is supplied from the reservoir 7 to the pressure medium line 10 ,
Die axialen Enden 1 1 des Gehäuses 4 liegen jeweils an einer konischen Anlagefläche 12 an (Figuren 2 und 3), wodurch das Gehäuse 4 zur Längsachse des Hohlraums 2 zentriert wird. Da der Außendurchmesser des im Wesentlichen hohlzylindrisch ausgebildeten Gehäuses 4 kleiner als der Innendurchmesser der Mantelfläche des Hohlraums 2 der Nockenwelle 3 ausgebildet ist, liegt das Gehäuse 4 an keiner Stelle der Mantelfläche des Hohlraums 2 an. Somit besteht nicht die Gefahr, dass das Gehäuse 4 während des Positionierens in dem Hohlraum 2 durch Unebenheiten an dessen Mantelfläche deformiert wird. Da- durch ist sichergestellt, dass der Kolben 5 innerhalb des Gehäuses 4 nicht verklemmt, sondern leichtgängig verschiebbar ist. Somit entfällt eine kosten- und zeitintensive spanende Nachbearbeitung der Mantelfläche des Hohlraums 2 der Nockenwelle 3. Die Innenmantelfläche des Gehäuses 4 kann durch ent- sprechende Herstellungsverfahren kostenneutral den Anforderungen, die an eine optimale Lauffläche für den Kolben 5 gestellt werden, hergestellt werden. Dabei können spanlose Herstellungsverfahren genutzt werden, beispielsweise Tiefziehverfahren, durch die automatisch Flächen entsprechender Güte erzeugt werden. The axial ends 1 1 of the housing 4 are in each case on a conical contact surface 12 (Figures 2 and 3), whereby the housing 4 is centered to the longitudinal axis of the cavity 2. Since the outer diameter of the substantially hollow cylindrical housing 4 is formed smaller than the inner diameter of the lateral surface of the cavity 2 of the camshaft 3, the housing 4 is located at no point on the lateral surface of the cavity 2. Thus, there is no risk that the housing 4 is deformed during positioning in the cavity 2 by bumps on the lateral surface. There- by ensuring that the piston 5 is not jammed inside the housing 4, but is easily displaced. Thus, a costly and time-consuming machining post-processing of the lateral surface of the cavity 2 of the camshaft 3. The inner surface of the housing 4 can be produced cost-neutral by appropriate manufacturing processes the requirements that are placed on an optimal running surface for the piston 5. In this case, non-cutting production methods can be used, for example deep-drawing process, are automatically generated by the surfaces of appropriate quality.
In der dargestellten Ausführungsform liegt das vorratsraumseitige Ende des Gehäuses 4 an einer rotationssymmetrischen, konischen Anlagefläche 12 an, die direkt an der Mantelfläche des Hohlraums 2 der Nockenwelle 3 ausgebildet ist (Figur 2). Die konische Anlagefläche 12 ist an einer Innenmantelfläche des Hohlraums 2 ausgebildet und das axiale Ende 1 1 des Gehäuses 4 greift in den Bereich des Innenkonus ein. In the illustrated embodiment, the reservoir-side end of the housing 4 rests against a rotationally symmetrical, conical abutment surface 12, which is formed directly on the lateral surface of the cavity 2 of the camshaft 3 (FIG. 2). The conical contact surface 12 is formed on an inner circumferential surface of the cavity 2 and the axial end 1 1 of the housing 4 engages in the region of the inner cone.
Das andere axiale Ende 1 1 des Gehäuses 4 liegt an einer konischen Anlagefläche 12 eines Bauteils 13 an, das separat zu dem Volumenspeicher 1 und der Nockenwelle 3 gefertigt wurde und nachträglich mittels eines Presssitzes mit der Innenmantelfläche des Hohlraums 2 der Nockenwelle 3 verbunden wurde (Figur 3). Die konische Anlagefläche 12 ist an einer Innenmantelfläche des Bauteils 13 ausgebildet und das axiale Ende 1 1 des Gehäuses 4 greift in den Bereich des Innenkonus ein. Das Bauteil 13 weist eine zentrale Durchgangsöffnung 14 auf, über die der Komplementärraum 8 mit dem Inneren der Brennkraftmaschine kommuniziert. Somit kann der Komplementärraum 8 entlüftet werden und Druckmittel aus diesem entweichen.  The other axial end 1 1 of the housing 4 is located on a conical contact surface 12 of a component 13, which was made separately from the volume memory 1 and the camshaft 3 and was subsequently connected by means of a press fit with the inner circumferential surface of the cavity 2 of the camshaft 3 (FIG 3). The conical bearing surface 12 is formed on an inner circumferential surface of the component 13 and the axial end 1 1 of the housing 4 engages in the region of the inner cone. The component 13 has a central passage opening 14, via which the complementary space 8 communicates with the interior of the internal combustion engine. Thus, the complementary space 8 can be vented and escape pressure medium from this.
Figur 4 zeigt einen Teillängsschnitt durch einen zweiten erfindungsgemäßen Volumenspeicher 1 , der in einem Hohlraum 2 einer Nockenwelle 3 angeordnet ist. Dabei ist nur der Bereich des Komplementärraums 8 dargestellt. Im Unter- schied zu der ersten Ausführungsform ist zusätzlich ein Führungselement 15 vorgesehen, welches das Federelement 6 radial unterstützt und an dem sich das Federelement 6 axial abstützt. Das Führungselement 15 weist axiale Ent- lüftungskanäle 16 auf, die mit der Durchgangsöffnung 14 und dem Raum, in dem das Federelement 6 aufgenommen ist, kommunizieren. FIG. 4 shows a partial longitudinal section through a second volume accumulator 1 according to the invention, which is arranged in a cavity 2 of a camshaft 3. Only the area of the complementary space 8 is shown here. In contrast to the first embodiment, a guide element 15 is additionally provided, which supports the spring element 6 radially and on which the spring element 6 is axially supported. The guide element 15 has axial dis- venting channels 16 which communicate with the through-hole 14 and the space in which the spring element 6 is received.
Darüber hinaus ist die konische Anlagefläche 12 des separaten Bauteils 13 an einer Außenmantelfläche des Bauteils 13 ausgebildet, wobei der dadurch ge- bildete Außenkonus in das Gehäuse 4 eingreift. An der konischen Anlagefläche 12 liegt in dieser Ausführungsform nicht das Gehäuse 4, sondern das Führungselement 15 an, welches das Gehäuse in Richtung der konischen Anlagefläche 12 hintergreift. Somit liegt in axialer Richtung das Führungselement 15 an der konischen Anlagefläche 12 und das Gehäuse 4 an dem Führungsele- ment 15 an, wodurch dieses zentrisch innerhalb der Nockenwelle 3 fixiert ist. In addition, the conical contact surface 12 of the separate component 13 is formed on an outer circumferential surface of the component 13, wherein the outer cone formed thereby engages in the housing 4. In this embodiment, not the housing 4, but the guide element 15, which engages behind the housing in the direction of the conical contact surface 12, rests against the conical contact surface 12. Thus, in the axial direction, the guide element 15 rests against the conical bearing surface 12 and the housing 4 against the guide element 15, as a result of which it is fixed centrally within the camshaft 3.
Bezugszeichen reference numeral
1 Volumenspeicher 1 volume memory
2 Hohlraum  2 cavity
3 Nockenwelle  3 camshaft
4 Gehäuse  4 housing
5 Trennelement / Kolben  5 separating element / piston
6 Federelement  6 spring element
7 Vorratsraum  7 pantry
8 Komplementärraum  8 Complementary space
9 Öffnung  9 opening
10 Druckmittelleitung  10 pressure medium line
1 1 axiales Ende  1 1 axial end
12 konische Anlagefläche  12 conical contact surface
13 Bauteil  13 component
14 Durchgangsöffnung  14 passage opening
15 Führungselement  15 guide element
16 Entlüftungskanäle  16 ventilation channels

Claims

Patentansprüche claims
1 . Volumenspeicher (1 ) mit einem im Wesentlichen hohlzylindrisch ausgebildeten Gehäuse (4) und einem innerhalb des Gehäuses (4) verlagerbar an- geordneten Trennelement (5), 1 . Volume memory (1) with a substantially hollow cylindrical housing (4) and a within the housing (4) arranged displaceably separating element (5),
- wobei das Gehäuse (4) unverschiebbar innerhalb eines Hohlraums 2() einer Nockenwelle (3) angeordnet ist,  - Wherein the housing (4) is arranged immovably within a cavity 2 () of a camshaft (3),
dadurch gekennzeichnet, dass die axialen Enden (1 1 ) des Volumenspeichers (1 ) an jeweils einer konischen Anlagefläche (12) anliegen, die inner- halb des Hohlraums (2) angeordnet sind.  characterized in that the axial ends (1 1) of the volume memory (1) abut in each case on a conical bearing surface (12), which are arranged within the cavity (2).
2. Volumenspeicher (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass eine der konischen Anlageflächen (12) an einer Mantelfläche des Hohlraums (2) ausgebildet ist. 2. Volume memory (1) according to claim 1, characterized in that one of the conical bearing surfaces (12) on a lateral surface of the cavity (2) is formed.
3. Volumenspeicher (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass zumindest eine der konischen Anlageflächen (12) an einem separaten Bauteil (13) ausgebildet ist, das fest an der Nockenwelle (3) befestigt ist. 3. Volume memory (1) according to claim 1, characterized in that at least one of the conical bearing surfaces (12) on a separate component (13) is formed, which is fixedly secured to the camshaft (3).
4. Volumenspeicher (1 ) nach Anspruch 3, dadurch gekennzeichnet, dass die konische Anlagefläche (12) an einer Außenmantelfläche des separaten Bauteils (13) ausgebildet ist und in das Gehäuse (4) eingreift. 4. volume memory (1) according to claim 3, characterized in that the conical contact surface (12) is formed on an outer circumferential surface of the separate component (13) and engages in the housing (4).
5. Volumenspeicher (1 ) nach Anspruch 3, dadurch gekennzeichnet, dass die konische Anlagefläche (12) an einer Innenmantelfläche des separaten Bauteils (13) ausgebildet ist, in das das Gehäuse (4) eingreift. 5. Volume memory (1) according to claim 3, characterized in that the conical bearing surface (12) on an inner circumferential surface of the separate component (13) is formed, in which the housing (4) engages.
6. Volumenspeicher (1 ) nach Anspruch 3, dadurch gekennzeichnet, dass das separate Bauteil (13) kraft-, form- oder stoffschlüssig mit einer Mantel- fläche des Hohlraums (2) verbunden ist. 6. volume memory (1) according to claim 3, characterized in that the separate component (13) non-positively, positively or materially connected to a lateral surface of the cavity (2) is connected.
7. Volumenspeicher (1 ) nach Anspruch 1 , dadurch gekennzeichnet, dass ein Innendurchmesser des Hohlraums (2) größer als ein Außendurchmesser des Gehäuses (4) ausgebildet ist. 7. volume memory (1) according to claim 1, characterized in that an inner diameter of the cavity (2) is greater than an outer diameter of the housing (4) is formed.
EP10728202.2A 2009-08-01 2010-06-24 Volume store Not-in-force EP2459851B1 (en)

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CN102472128A (en) 2012-05-23
US20120125272A1 (en) 2012-05-24
CN102472128B (en) 2016-08-03

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