EP2564040A1 - Système d'accumulation de pression pour un système de réglage d'arbre à cames - Google Patents

Système d'accumulation de pression pour un système de réglage d'arbre à cames

Info

Publication number
EP2564040A1
EP2564040A1 EP11714014A EP11714014A EP2564040A1 EP 2564040 A1 EP2564040 A1 EP 2564040A1 EP 11714014 A EP11714014 A EP 11714014A EP 11714014 A EP11714014 A EP 11714014A EP 2564040 A1 EP2564040 A1 EP 2564040A1
Authority
EP
European Patent Office
Prior art keywords
pressure accumulator
camshaft
housing
control valve
pressure
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
EP11714014A
Other languages
German (de)
English (en)
Other versions
EP2564040B1 (fr
Inventor
Michael Busse
Mathias Boegershausen
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 EP2564040A1 publication Critical patent/EP2564040A1/fr
Application granted granted Critical
Publication of EP2564040B1 publication Critical patent/EP2564040B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • F01L1/3442—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear using hydraulic chambers with variable volume to transmit the rotating force
    • F01L2001/34423—Details relating to the hydraulic feeding circuit
    • F01L2001/34446—Fluid accumulators for the feeding circuit

Definitions

  • the invention relates to a pressure accumulator arrangement in a camshaft for a camshaft adjusting system of an internal combustion engine having at least one pressure accumulator and at least one control valve.
  • camshaft adjustment systems are used for the variable adjustment of the timing of gas exchange valves, in order to be able to make the phase relation between crankshaft and camshaft variable within a defined angular range.
  • hydraulic camshaft adjustment systems require energy for the adjustment process which is made available to them via a pressure medium system.
  • the energy available in the pressure medium system is formed from the product of pressure medium pressure and pressure medium volume flow.
  • the required pressure medium flow flowing in the camshaft adjuster In an adjustment of one or more camshafts of the internal combustion engine is branched off by means of at least one control valve which is connected upstream of the camshaft adjuster, the required pressure medium flow flowing in the camshaft adjuster.
  • the volume accumulator is formed in a cavity of a camshaft and is connected via a disposed in the camshaft pressure medium passage with a control valve, which serves to supply the camshaft adjuster with pressure medium, in conjunction.
  • control valve and volume memory are designed separately. As a result, these components must be mounted individually on each side of the camshaft and connected to each other by a pressure medium channel in the camshaft. In addition, throttling losses may occur in the pressure medium channel, in particular due to cross-sectional constrictions, additional internals or deflections, as a result of which the function of the pressure accumulator is impaired.
  • the invention is therefore an object of the invention to simplify an accumulator assembly of the aforementioned type in terms of their structure and to make cost-effective.
  • the object is solved by the features of claim 1.
  • an accumulator assembly are connected to the pressure accumulator and control valve to form a unit.
  • the accumulator assembly is easy to manufacture and easily mounted in the camshaft on one side.
  • such a structural unit improves the function of the pressure accumulator; in particular, throttling losses between it and the pressure accumulator can be avoided by the direct connection of the pressure accumulator to the control valve.
  • An assembly of pressure accumulator and control valve for arrangement in the camshaft can be achieved in a particularly simple manner when pressure Memory and control valve at end portions of their housing are inserted into each other and form a press fit. Also conceivable are other non-positive and / or positive and / or cohesive connections of the housing.
  • control valve and pressure accumulator are designed at their nested housing end sections with retracted diameter.
  • a radial annular gap with respect to the inner wall of the camshaft.
  • the pressure medium supply of the assembly can take place directly on the housing end sections.
  • a plurality of radially aligned openings are preferably provided on the housing end sections in the region of the annular gap, which communicate via the annular gap with a pressure medium supply connection on the camshaft.
  • the housing end portion of the control valve is axially inserted into the end portion of the housing of the pressure accumulator and designed extended such that it forms at its front end in the housing of the pressure accumulator at the same time an end stop for a piston axially displaceable in this.
  • FIG. 1 shows a longitudinal section of an accumulator assembly according to the invention in a camshaft
  • FIG. 1 shows an embodiment of an accumulator assembly according to the invention for a not shown hydraulic Nockenwellenverstell- system of an internal combustion engine.
  • the accumulator assembly is arranged in a camshaft of the internal combustion engine and consists of a pressure accumulator and a control valve, which are formed as a structural unit.
  • the camshaft is axially open on both sides, for example, designed as a hollow shaft.
  • the camshaft for receiving the building unit has a cylindrical cavity, which is designed in two sections with different diameters in each case as an axial central bore.
  • the control valve designed as a central valve is arranged in a first section of the cavity.
  • the control valve is upstream of the camshaft adjusting system and consists of a central valve assembly 6, which has a substantially cylindrical housing.
  • the first section of the cavity is adjoined at an annular step 7 by a second section, which is of a slightly reduced diameter and has the pressure accumulator consisting of a pressure accumulator subassembly 8.
  • This comprises a substantially hollow cylindrical housing, a piston 5 and a compression spring 9.
  • the piston 5 separates in the interior of the housing a the control valve axially facing and about this with the camshaft adjusting system in fluid communication pressure chamber of a non-pressurized complementary space in which the compression spring 9 up - is taken.
  • the piston 5 is pot-shaped, arranged axially displaceable in the housing and is guided on the inner wall thereof.
  • Both the housing and the piston 5 are executable in sheet metal and without cutting, in particular by deep drawing, produced.
  • the control valve and pressure accumulator are arranged coaxially in the camshaft and connected to their housings to form a structural unit.
  • the mutually axially facing hollow cylindrical end portions 1, 2 of their housing are inserted into one another and form a press fit.
  • dere non-positive and / or positive and / or cohesive connections such as screw, adhesive bonds or connections by crimping.
  • the control valve and pressure accumulator form a pressure accumulator central valve assembly, which can be easily inserted as a component for mounting on the camshaft adjustment system facing the open end of the camshaft into the cavity.
  • the piston 5 In the housing of the pressure accumulator, the piston 5 is acted upon medium on its side facing the pressure chamber closed axial side via the end portion 2 with pressure and is at the same time facing away from the pressure chamber axial side with the running as a helical compression spring compression spring 9 in operative connection.
  • a helical compression spring compression spring 9 in operative connection.
  • the pressure medium leakage on the piston 5 in the housing of the accumulator can be removed at the averted from the camshaft adjusting open end of the camshaft via a drain connection to a pressure medium reservoir, such as the engine oil tank of the internal combustion engine, and at the same time the housing on the spring side and vented.
  • a pressure medium reservoir such as the engine oil tank of the internal combustion engine
  • the helical compression spring is arranged coaxially in the housing of the pressure accumulator and, with its spring end section facing the piston 5, engages in its spring-side open end. The spring end portion rests against the closed axial side of the piston 5 inside. At the end remote from the piston 5 Federendabterrorism the helical compression spring is at one in the Housing integrated spring support 10 axially supported. The helical compression spring is guided during a movement of the piston 5 on the inner wall of the housing and on the inner wall of the piston 5. To limit the movement of the piston 5 in the tensioned state of the helical compression spring an integrated into the housing axial stop 1 1 is provided. Figure 1 shows the piston 5 in the position on the stop 1 1 with tensioned helical compression spring.
  • the pressure accumulator arrangement is shown in an enlarged detail (detail Z from FIG. 1) on the end region of the camshaft facing the camshaft adjusting system.
  • the central valve assembly 6 is received in the first section of the cavity.
  • This comprises the housing, an intermediate sleeve and a control piston accommodated therein and a plate check valve 12 integrated into the control valve.
  • the control valve communicates with the camshaft adjusting system via working ports A, B.
  • the axially movable in the housing arranged control piston is controlled via a dashed lines schematically indicated central magnet.
  • a drain port T is formed, can flow through the pressure medium from the camshaft adjusting system in a pressure medium reservoir, not shown.
  • the plate check valve 12 serves to prevent a backflow in the direction of the pressure medium inlet port P and is integrated into the end region of the control valve facing the pressure-sensitive area in a separately designed housing part. This is formed on the outside of the housing of the control valve in an annular radial groove form-fitting attachable and running on its side facing the pressure accumulator by the remote with retracted diameter hollow cylindrical end portion 1 axially extended. For connection to the control valve of this facing hollow cylindrical end portion 2 of the housing of the pressure accumulator is retracted in diameter and pressed axially in a press fit on the end portion 1.
  • the end portion 1 is extended axially executed that it forms an end stop for the piston 5 at its front end in the housing of the pressure accumulator, approximately at the level of the paragraph formed by the retracted end portion 2 on the housing in the relaxed state of the helical compression spring.
  • a radial annular gap is formed in the cavity of the camshaft relative to the inner wall of the camshaft.
  • a pressure medium inlet port P is provided on the camshaft, which is connected via a not shown pressure fluid system, such as the Motorolniklauf the internal combustion engine, with a pressure medium pump in combination.
  • the pressure medium inlet port P has a plurality of distributed over the circumference radial through holes on the camshaft.
  • control valve and the accumulator can be inserted as a construction and mounting unit on the Camwellenverstellsystem facing open end of the camshaft until the annular shoulder 13 abuts the ring stage 7.
  • the assembly is axially secured in the assembled state at the ring stage 7 accumulator side in the camshaft.
  • Valve side, the axial position assurance of the assembly takes place by means of a locking ring 14 which is arranged in an annular groove on the inner wall in the first cavity of the camshaft on the axially remote from the pressure accumulator side of the housing.
  • the housing is located on the locking ring 14 frontally axially.
  • the housing of the control valve and the inner wall of the camshaft form a cylindrical clearance fit.
  • the control valve and pressure accumulator can be centered as a unit in the camshaft on the housing of the control valve.
  • the housing of the pressure accumulator in the second section of the cavity is arranged with a radial annular gap to the inner wall of the camshaft.
  • manufacturing tolerances on the outer diameter of the housing of the pressure accumulator can be compensated or the requirements for the manufacturing tolerances of the second portion of the cavity in the camshaft, be set lower.
  • a slight expansion of the housing may be provided on the end region of the housing facing away from the control valve.

Landscapes

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

Abstract

L'invention concerne un système d'accumulation de pression dans un arbre à cames pour un système de réglage d'arbre à cames d'un moteur à combustion interne comprenant au moins un accumulateur de pression et au moins une soupape de commande, caractérisé en ce que l'accumulateur de pression et la soupape de commande sont reliés pour former une unité structurale.
EP11714014.5A 2010-04-26 2011-04-04 Système d'accumulation de pression pour un système de réglage d'arbre à cames Not-in-force EP2564040B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010018203A DE102010018203A1 (de) 2010-04-26 2010-04-26 Druckspeicheranordnung für ein Nockenwellenverstellsystem
PCT/EP2011/055173 WO2011134740A1 (fr) 2010-04-26 2011-04-04 Système d'accumulation de pression pour un système de réglage d'arbre à cames

Publications (2)

Publication Number Publication Date
EP2564040A1 true EP2564040A1 (fr) 2013-03-06
EP2564040B1 EP2564040B1 (fr) 2017-08-30

Family

ID=43881217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11714014.5A Not-in-force EP2564040B1 (fr) 2010-04-26 2011-04-04 Système d'accumulation de pression pour un système de réglage d'arbre à cames

Country Status (5)

Country Link
US (1) US8820282B2 (fr)
EP (1) EP2564040B1 (fr)
CN (1) CN102859129B (fr)
DE (1) DE102010018203A1 (fr)
WO (1) WO2011134740A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012201567B4 (de) * 2012-02-02 2013-12-05 Schaeffler Technologies AG & Co. KG Gestaltung eines Hydraulikölkanals zwischen einem Zentralventil und einem Volumenspeicher eines Nockenwellenverstellers
DE102012210795B3 (de) * 2012-06-26 2013-09-19 Schaeffler Technologies AG & Co. KG Druckspeicher
US9121358B2 (en) 2013-02-22 2015-09-01 Borgwarner Inc. Using camshaft timing device with hydraulic lock in an intermediate position for vehicle restarts
US8893677B2 (en) 2013-03-14 2014-11-25 Borgwarner Inc. Dual lock pin phaser
DE112014002471B4 (de) 2013-06-19 2017-01-19 Borgwarner Inc. Variabler Nockenwellenverstellmechanismus mit durch Öldruck eingerücktem Verriegelungsstift
US20170193644A1 (en) * 2015-12-30 2017-07-06 Ebay Inc Background removal
CN109209548B (zh) 2017-06-30 2022-01-25 博格华纳公司 具有两个锁定位置的可变凸轮轴正时装置
DE102019113638B3 (de) * 2019-05-22 2020-09-17 Schaeffler Technologies AG & Co. KG Steuerventil mit einem integriertem aktiven Druckspeicher

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3929621A1 (de) * 1989-09-06 1991-03-07 Bayerische Motoren Werke Ag Vorrichtung zur relativen drehwinkelverstellung einer welle zu einem antriebsrad, insbesondere nockenwelle einer brennkraftmaschine
DE4210580C2 (de) * 1992-03-31 2001-06-28 Bosch Gmbh Robert Vorrichtung zur Winkelverstellung der Nockenwelle einer Brennkraftmaschine
US6871620B2 (en) * 2002-04-09 2005-03-29 Ford Global Technologies, Llc Variable cam timing unit oil supply arrangement
DE10228354B4 (de) * 2002-06-25 2017-06-22 Daimler Ag Vorrichtung zur Druckversorgung einer Nockenwellen-Verstelleinrichtung
WO2008140897A1 (fr) * 2007-05-14 2008-11-20 Borgwarner Inc. Accumulateur monté sur came
US8215274B2 (en) * 2008-06-18 2012-07-10 GM Global Technology Operations LLC Hydraulic control system for engine cam phasing
JP2010014026A (ja) 2008-07-03 2010-01-21 Toyota Motor Corp 内燃機関の動弁装置
DE102009049459A1 (de) 2009-10-15 2011-04-21 Schaeffler Technologies Gmbh & Co. Kg Volumenspeicher

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2011134740A1 *

Also Published As

Publication number Publication date
WO2011134740A1 (fr) 2011-11-03
CN102859129A (zh) 2013-01-02
CN102859129B (zh) 2015-02-18
EP2564040B1 (fr) 2017-08-30
DE102010018203A1 (de) 2011-10-27
US20130008399A1 (en) 2013-01-10
US8820282B2 (en) 2014-09-02

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