EP1075589B1 - Hydraulic valve-play compensation element - Google Patents
Hydraulic valve-play compensation element Download PDFInfo
- Publication number
- EP1075589B1 EP1075589B1 EP99919221A EP99919221A EP1075589B1 EP 1075589 B1 EP1075589 B1 EP 1075589B1 EP 99919221 A EP99919221 A EP 99919221A EP 99919221 A EP99919221 A EP 99919221A EP 1075589 B1 EP1075589 B1 EP 1075589B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- compensating element
- force
- element according
- hydraulic valve
- 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.)
- Expired - Lifetime
Links
Images
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
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
Definitions
- the invention relates to a hydraulic valve lash adjuster (HVA) according to the preamble of the claim.
- HVA hydraulic valve lash adjuster
- valve clearance compensation element is from DE-OS 38 19 927 known.
- HVA is known from EP 324085. There should the HVA adjustment function is switched off in engine braking mode his. For this, the HVA has a sealed High pressure space and a capillary overflow hole - over the "leakage oil" to ensure a decrease in length of the HVA can flow - on.
- engine braking mode one of a piston actuated valve body pressed into the valve seat. Both the inlet to the high pressure room and also the opening of the capillaries in the valve seat surface Overflow hole closed. Through the confluence the capillary overflow hole directly into the seat of the valve should probably be prevented that the effective pressure in the high pressure chamber also on the valve body acts in total and so the valve opens. Whether this goal is reached, however, appears uncertain.
- the invention deals with the problem of a hydraulic To create valve lash adjuster that in The set state of rest even under high force Length not changed. This problem is solved with a hydraulic valve lash adjuster Claim 1.
- Advantageous further developments are the subject of subclaims.
- the basic idea of the invention is that of hydraulic Valve clearance compensation elements available for the function necessary leakage oil loss between the cylinder part and the piston part occurs when the engine is at a standstill prevent.
- the valve clearance compensation element consists of a cylinder part 1 and a piston part 2, which by a spring 3rd are braced against each other.
- a spring 3rd is the relative movement of cylinder part 1 and piston part 2 by means of a spring ring 8 limited.
- the oil is supplied through the supply hole 19 in the pressure piece 7.
- the spring 3 lies in a between the cylinder part 1 and the piston part 2 formed high pressure or work space 20, the through a check valve 4 - consisting of a closure part 11, a valve spring 12 and a valve cage 13 - is sealed.
- the valve lash adjuster corresponds the conventional design.
- check valve 4 second valve 5 which has a valve cage 10 with integrated Has valve spring and a closure part 9.
- the closure part 9 can against the pressure of the valve spring lifted out of the valve seat by an actuating piston 6 become.
- the actuating piston 6 has on its top a larger effective area for the pending oil pressure than at its bottom.
- the resulting force on the piston 6 stands for the opening function of the valve Available and is on the surface 16 on the closure part 9 transferred. That between piston part 2 and actuating piston 6 escaping leakage oil flows through the relief bore 14 depressurized from the HVA.
- the piston 6 has a bore through which oil from the reservoir 19 on the storage room 18 and between the Valve lying space 17 flow into the high pressure space 20 can.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Description
Die Erfindung betrifft ein hydraulisches Ventilspielausgleichselement (HVA) nach dem Oberbegriff des Patentanspruchs. Bei hydraulischen Spielausgleichselementen erfolgt das Nachstellen bzw. eine Längenzunahme bei vorhandenem Spiel durch den Schmieröldruck, eine Längenabnahme aufgrund eines kleinen Leckageölstroms in Verbindung mit dem das Ausgleichselement zusammenpressenden Nocken der Nockenwelle.The invention relates to a hydraulic valve lash adjuster (HVA) according to the preamble of the claim. With hydraulic lash adjusters readjustment or an increase in length takes place if there is one Game through the oil pressure, a decrease in length due to a small leakage oil flow in connection with the cam pressing the compensating element Camshaft.
Ein derartiges Ventilspielausgleichselement ist aus der DE-OS 38 19 927 bekannt. Dort ist bei einem üblichen hydraulischen Ventilspielausgleichselement ein zusätzliches Rückschlagventil vorgesehen, das bei Motorstillstand eine Entleerung des vor dem Hochdruckraum liegenden ölbefüllten Vorratsraums verhindern soll. Dabei wird jedoch nicht verhindert, daß, solange das Spielausgleichselement bei geöffnetem Ventil im Motorstillstand durch den Nocken der Nokkenwelle belastet ist, die Ölfüllung des Arbeits- bzw. Hochdruckraums infolge des zwischen Zylinderteil und Kolbenteil durchtretenden Leckageöls abnimmt und das Spielausgleichselement dementsprechend seine Länge verkürzt. Dies ist im Ruhezustand unerwünscht, da es beim nachfolgenden Startvorgang zu erhöhtem Ventilspiel führt.Such a valve clearance compensation element is from DE-OS 38 19 927 known. There is a usual hydraulic Valve clearance compensation element an additional check valve provided that an emptying at engine standstill of the oil-filled in front of the high-pressure room Prevent pantry. However, this does not prevent that as long as the game compensation element is open Valve in the engine standstill through the cam of the camshaft is loaded, the oil filling of the work or High pressure space due to the between the cylinder part and piston part leakage oil penetrating decreases and the play compensation element accordingly its length is shortened. This is undesirable in the idle state, since it is the following Starting process leads to increased valve clearance.
Ein weiteres HVA ist aus der EP 324085 bekannt. Dort soll im Motorbremsbetrieb die Nachstellfunktion des HVA ausgeschaltet sein. Hierfür weist das HVA einen abgedichteten Hochdruckraum und eine kapillare Überströmbohrung - über die "Leckageöl" zur Gewährleistung einer Längenabnahme des HVA abströmen kann - auf. Im Motorbremsbetrieb wird ein von einem Kolben betätigter Ventilkörper in den Ventilsitz gedrückt. Dabei wird sowohl der Zulauf zum Hochdruckraum als auch die in der Ventilsitzfläche liegende Öffnung der kapillaren Überströmbohrung verschlossen. Durch die Einmündung der kapillaren Überströmbohrung direkt in die Sitzfläche des Ventils soll vermutlich verhindert werden, daß der im Hochdruckraum wirksame Druck auch auf den Ventilkörper insgesamt einwirkt und so das Ventil öffnet. Ob dieses Ziel erreicht wird, erscheint jedoch unsicher.Another HVA is known from EP 324085. There should the HVA adjustment function is switched off in engine braking mode his. For this, the HVA has a sealed High pressure space and a capillary overflow hole - over the "leakage oil" to ensure a decrease in length of the HVA can flow - on. In engine braking mode, one of a piston actuated valve body pressed into the valve seat. Both the inlet to the high pressure room and also the opening of the capillaries in the valve seat surface Overflow hole closed. Through the confluence the capillary overflow hole directly into the seat of the valve should probably be prevented that the effective pressure in the high pressure chamber also on the valve body acts in total and so the valve opens. Whether this goal is reached, however, appears uncertain.
Die Erfindung beschäftigt sich mit dem Problem, ein hydraulisches
Ventilspielausgleichselement zu schaffen, das im
Ruhezustand auch unter hoher Krafteinwirkung die eingestellte
Länge nicht verändert. Dieses Problem wird gelöst
durch ein hydraulisches Ventilspielausgleichselement nach
Anspruch 1. Vorteilhafte Weiterbildungen sind Gegenstand
der Unteransprüche.The invention deals with the problem of a hydraulic
To create valve lash adjuster that in
The set state of rest even under high force
Length not changed. This problem is solved
with a hydraulic valve
Grundgedanke der Erfindung ist es, den bei hydraulischen Ventilspielausgleichselementen vorhandenen, für die Funktion notwendigen Leckageölverlust, der zwischen dem Zylinderteil und dem Kolbenteil auftritt, bei Motorstillstand zu verhindern. Dies erfolgt erfindungsgemäß dadurch, daß das Leckageöl in den Raum eingeleitet wird, der zwischen dem Rückschlagventil des Hochdruckraums und einem zweiten Ventil liegt. Dies führt bei Motorstillstand zu einer selbstverstärkenden Dichtfunktion des zweiten Ventils. Voraussetzung hierfür ist, daß das Leckageöl nicht auf anderem Weg abfließen kann. Deshalb ist der Spalt zwischen Zylinderteil und Kolbenteil des Spielausgleichselements jenseits der Überströmbohrung besonders abzudichten, z. B. durch besonders enge Spielgebung oder eine besondere Dichtung.The basic idea of the invention is that of hydraulic Valve clearance compensation elements available for the function necessary leakage oil loss between the cylinder part and the piston part occurs when the engine is at a standstill prevent. This takes place according to the invention in that the Leakage oil is introduced into the space between the Check valve of the high pressure chamber and a second valve lies. This leads to a self-reinforcing when the engine is stopped Sealing function of the second valve. requirement this is because the leakage oil is not in any other way can drain off. That is why the gap is between Cylinder part and piston part of the play compensation element to seal especially beyond the overflow hole, e.g. B. through particularly tight play or a special seal.
Da die Spielausgleichsfunktion durch Schaffung eines abgedichteten Raums, aus dem das Leckageöl nicht entweichen kann, behindert würde, muß für den Motorbetrieb gewährleistet werden, daß das Leckageöl entweichen kann. Dies erfolgt erfindungsgemäß dadurch, daß das zweite, versorgungsseitige Ventil durch einen von einer definierten Kraft betätigten Kolben im Motorbetrieb geöffnet und offengehalten wird.Because the game balancing function by creating a sealed Space from which the leakage oil does not escape can, would be hindered, must be guaranteed for engine operation that the leakage oil can escape. this happens according to the invention in that the second supply side Valve operated by a defined force Pistons opened and kept open during engine operation becomes.
Durch die Ausbildung des Betätigungskolbens gemäß Anspruch 4 als vom Schmieröl durchströmtes Bauteil läßt sich, verglichen mit dem in der EP 324085 dargestellten HVA, eine platzsparende Ausführung erzielen.By designing the actuating piston according to claim 4 as a component through which the lubricating oil flows can be compared with the HVA shown in EP 324085, a achieve space-saving execution.
Die Erfindung wird im folgenden anhand eines Ausführungsbeispiels beschrieben. Es zeigt:
- Fig. 1
- ein erfindungsgemäßes Ventilspielausgleichselement.
- Fig. 1
- an inventive valve clearance compensation element.
Das Ventilspielausgleichselement besteht aus einem Zylinderteil
1 und einem Kolbenteil 2, die durch eine Feder 3
gegeneinander verspannt sind. Dabei ist die Relativbewegung
von Zylinderteil 1 und Kolbenteil 2 durch einen Federring 8
begrenzt. Die Ölzufuhr erfolgt durch die Zuleitungsbohrung
19 im Druckstück 7.The valve clearance compensation element consists of a
Die Feder 3 liegt in einem zwischen Zylinderteil 1 und Kolbenteil
2 gebildeten Hochdruck- bzw. Arbeitsraum 20, der
durch ein Rückschlagventil 4 - bestehend aus einem Verschlußteil
11, einer Ventilfeder 12 und einem Ventilkäfig
13 - abgedichtet ist. Insoweit entspricht das Ventilspielausgleichselement
der konventionellen Bauart.The
In Strömungsrichtung vor dem Rückschlagventil 4 liegt ein
zweites Ventil 5, das einen Ventilkäfig 10 mit integrierter
Ventilfeder und ein Verschlußteil 9 aufweist.In the direction of flow there is a check valve 4
Das Verschlußteil 9 kann gegen den Druck der Ventilfeder
durch einen Betätigungskolben 6 aus dem Ventilsitz gehoben
werden. Der Betätigungskolben 6 weist auf seiner Oberseite
eine größere Wirkfläche für den anstehenden Öldruck auf als
an seiner Unterseite. Die hieraus resultierende Kraft auf
den Kolben 6 steht für die Öffnungsfunktion des Ventils zur
Verfügung und wird über die Fläche 16 auf das Verschlußteil
9 übertragen. Das zwischen Kolbenteil 2 und Betätigungskolben
6 entweichende Leckageöl strömt durch die Entlastungsbohrung
14 drucklos aus dem HVA.The closure part 9 can against the pressure of the valve spring
lifted out of the valve seat by an actuating piston 6
become. The actuating piston 6 has on its top
a larger effective area for the pending oil pressure than
at its bottom. The resulting force on
the piston 6 stands for the opening function of the valve
Available and is on the
Der Kolben 6 weist eine Bohrung auf, über die Öl vom Vorratsraum
19 über den Vorratsraum 18 und den zwischen den
Ventilen liegenden Raum 17 in den Hochdruckraum 20 strömen
kann.The piston 6 has a bore through which oil from the
Das unter bestimmten Umständen wie z. B. bei von der Nokkenwelle
betätigtem Ventil auch im Motorstillstand zwischen
dem Zylinderteil 1 und dem Kolbenteil 2 abfließende Leckageöl
wird über eine Überströmbohrung 21 dem zwischen den
Ventilen 4 und 5 liegenden Raum 17 zugeführt und wirkt bei
geschlossenem Ventil 5 verstärkend auf dessen Dichtfunktion.
Um einen Druckverlust im Raum 17 weitgehend zu verhindern,
ist eine Ringdichtung 15 zwischen Zylinderteil 1 und
Kolbenteil 2 vorgesehen.The under certain circumstances such. B. from the camshaft
operated valve even when the engine is stopped
leakage oil flowing out of the
Claims (7)
- Hydraulic valve play compensating element for an internal-combustion engine with a cylinder part (1) and a piston part (2) displaceable in the cylinder part, the cylinder part (1) and piston part (2) being biased against each other by a spring (3) and enclosing a high pressure chamber (20) sealed by a high pressure-side return valve (4), and with a second supply-side valve (5) located upstream of the return valve (4) in the oil supply direction, the supply-side valve (5) being closed by a readjusting spring (10) when the engine is not running, characterised in that when the return valve (4) is closed the waste oil draining from the high pressure chamber (20) is conveyed into the chamber (17) between return valve (4) and valve (5) and there reinforces the sealing effect of the valve (5) when the engine is not running, in that the valve (5) is opened when the engine is running by means for producifig a defined force in the flow direction, and in that the valve (5) is held in the open position when the engine is running, irrespective of the through-flow direction of the lubricating oil, owing to the means for producing the defined force.
- Hydraulic valve play compensating element according to claim 1, characterised in that the force to open the valve (5) is a force of an actuating piston (6) produced by. the lubricating oil pressure.
- Hydraulic valve play compensating element according to claim 2, characterised in that the lubricating oil pressure is applied on both sides of the actuating piston (6) and the force to open the valve (5) is produced owing to different active faces.
- Hydraulic valve play compensating element according to claim 3, characterised in that the actuating piston (6) is flowed through.
- Hydraulic valve play compensating element according to claim 1, characterised in that the force to open the valve (5) is an actuating force produced electromagnetically.
- Hydraulic valve play compensating element according to any of the preceding claims, characterised in that a capillary overflow aperture is arranged between the high pressure chamber (20) and the chamber located between the valves (4) and (5).
- Hydraulic valve play compensating element according to any of the preceding claims, characterised in that at least one sealing ring (15) is arranged between cylinder part (1) and piston part (2).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19818893A DE19818893A1 (en) | 1998-04-28 | 1998-04-28 | Hydraulic valve lash adjuster |
| DE19818893 | 1998-04-28 | ||
| PCT/EP1999/002402 WO1999056007A1 (en) | 1998-04-28 | 1999-04-09 | Hydraulic valve-play compensation element |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1075589A1 EP1075589A1 (en) | 2001-02-14 |
| EP1075589B1 true EP1075589B1 (en) | 2002-07-31 |
Family
ID=7866007
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99919221A Expired - Lifetime EP1075589B1 (en) | 1998-04-28 | 1999-04-09 | Hydraulic valve-play compensation element |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6318325B1 (en) |
| EP (1) | EP1075589B1 (en) |
| DE (2) | DE19818893A1 (en) |
| WO (1) | WO1999056007A1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10012225A1 (en) | 2000-03-14 | 2001-09-20 | Mahle Ventiltrieb Gmbh | Hydraulic play compensation element to control gas exchange valve of internal combustion engine; has opposite clamp areas with moving parts to determine volume of pressure chamber between them |
| DE10031802B4 (en) * | 2000-07-04 | 2007-11-15 | Daimlerchrysler Ag | Hydraulic actuator |
| DE10129729A1 (en) * | 2001-06-20 | 2003-01-23 | Mahle Ventiltrieb Gmbh | Hydraulic lash adjuster for a valve train of an internal combustion engine |
| DE10143012A1 (en) * | 2001-09-03 | 2003-03-20 | Daimler Chrysler Ag | Engine charging valve play compensator has mutually sealed hollow cylinder parts forming pressure space with outwards link via spring-loaded valve |
| DE10231110A1 (en) | 2002-07-10 | 2004-01-29 | Daimlerchrysler Ag | Device for operating a hydraulically operated valve clearance compensation element of an internal combustion engine |
| DE10236492A1 (en) * | 2002-08-09 | 2004-02-19 | Daimlerchrysler Ag | Hydraulic play equalizing element for controlling gas exchange valve has both displaceable parts temporarily lockable to each other |
| US7273026B2 (en) * | 2002-10-18 | 2007-09-25 | Maclean-Fogg Company | Roller follower body |
| US6871622B2 (en) * | 2002-10-18 | 2005-03-29 | Maclean-Fogg Company | Leakdown plunger |
| DE102005029831A1 (en) | 2004-07-23 | 2006-03-16 | Ina-Schaeffler Kg | Hydraulic valve-lash-adjusting element for engine valve train, has valve shutter virtually stationary within piston which is moved relative to shutter to control upper and lower ports in piston |
| DE102006031706A1 (en) * | 2006-07-08 | 2008-01-10 | Daimlerchrysler Ag | Valve play element for compensating for play in an internal combustion engine's valves has a piston assigned with a pressurized space, a reservoir for a hydraulic substance and an adjusting element in the pressurized space |
| DE102010018208A1 (en) * | 2010-04-26 | 2011-10-27 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic valve clearance compensation element for reciprocating internal combustion engines |
| DE102011005575A1 (en) * | 2011-03-15 | 2012-09-20 | Schaeffler Technologies Gmbh & Co. Kg | Valve gear with additional lift in the cam base circle |
| EP2864600B1 (en) * | 2012-01-06 | 2018-08-08 | Scuderi Group, Inc. | Lost-motion variable valve actuation system |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1236857B (en) | 1963-05-15 | 1967-03-16 | Richard Kuechen | Hydraulic valve lash adjuster for internal combustion engines |
| US4633827A (en) * | 1985-10-07 | 1987-01-06 | Eaton Corporation | Hydraulic lash adjuster with combined reservoir extension and metering system |
| DE3635110A1 (en) * | 1985-10-15 | 1987-04-16 | Honda Motor Co Ltd | VALVE CONTROL DEVICE FOR AN INTERNAL COMBUSTION ENGINE |
| DE3819927A1 (en) * | 1987-06-22 | 1989-01-05 | Volkswagen Ag | Hydraulic valve clearance adjusting element |
| DE3800945C1 (en) * | 1988-01-15 | 1989-02-16 | Daimler-Benz Ag, 7000 Stuttgart, De | |
| JPH01232103A (en) | 1988-03-12 | 1989-09-18 | Mazda Motor Corp | Valve driving device for engine |
| US4977867A (en) * | 1989-08-28 | 1990-12-18 | Rhoads Jack L | Self-adjusting variable duration hydraulic lifter |
| DE4225012C1 (en) * | 1992-07-29 | 1993-07-15 | Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De | Hydraulic actuator for lifting valve with pressurised oil piston - has play compensation piston, located between working piston and valve, and loaded by compression spring |
| DE9318108U1 (en) | 1993-11-26 | 1994-01-20 | INA Wälzlager Schaeffler KG, 91074 Herzogenaurach | Pestle |
-
1998
- 1998-04-28 DE DE19818893A patent/DE19818893A1/en not_active Withdrawn
-
1999
- 1999-04-09 EP EP99919221A patent/EP1075589B1/en not_active Expired - Lifetime
- 1999-04-09 WO PCT/EP1999/002402 patent/WO1999056007A1/en active IP Right Grant
- 1999-04-09 DE DE59902193T patent/DE59902193D1/en not_active Expired - Lifetime
- 1999-04-09 US US09/673,469 patent/US6318325B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US6318325B1 (en) | 2001-11-20 |
| DE59902193D1 (en) | 2002-09-05 |
| DE19818893A1 (en) | 1999-11-04 |
| WO1999056007A1 (en) | 1999-11-04 |
| EP1075589A1 (en) | 2001-02-14 |
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