EP1358397A1 - Culbuteur pour mecanisme de distribution de moteur a combustion interne et dispositif d'ajustement/reajustement automatique du jeu des soupapes - Google Patents

Culbuteur pour mecanisme de distribution de moteur a combustion interne et dispositif d'ajustement/reajustement automatique du jeu des soupapes

Info

Publication number
EP1358397A1
EP1358397A1 EP02715421A EP02715421A EP1358397A1 EP 1358397 A1 EP1358397 A1 EP 1358397A1 EP 02715421 A EP02715421 A EP 02715421A EP 02715421 A EP02715421 A EP 02715421A EP 1358397 A1 EP1358397 A1 EP 1358397A1
Authority
EP
European Patent Office
Prior art keywords
valve
rocker arm
sliding block
hollow cylinder
flat surface
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
EP02715421A
Other languages
German (de)
English (en)
Other versions
EP1358397B1 (fr
Inventor
Günter Kampichler
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.)
Motorenfabrik Hatz GmbH and Co KG
Original Assignee
Motorenfabrik Hatz GmbH 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 Motorenfabrik Hatz GmbH and Co KG filed Critical Motorenfabrik Hatz GmbH and Co KG
Publication of EP1358397A1 publication Critical patent/EP1358397A1/fr
Application granted granted Critical
Publication of EP1358397B1 publication Critical patent/EP1358397B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms
    • F01L1/182—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft
    • F01L1/183—Centre pivot rocking arms the rocking arm being pivoted about an individual fulcrum, i.e. not about a common shaft of the boat type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/34—Lateral camshaft position

Definitions

  • the present invention relates to a rocker arm for a valve drive of an internal combustion engine for the open actuation of a valve stem against the spring force of a valve spring closing the valve, which is equipped with a mechanical valve lash adjusting element.
  • a typical internal combustion engine uses an array of valves to control the intake and discharge of gases into and out of an engine cylinder.
  • a valve is usually opened and closed electromagnetically or purely mechanically, in that the valve stem is actuated via a lever arrangement which in turn is controlled by a camshaft driven by the crankshaft of the engine.
  • the generally downward movement of the lever arrangement and the associated actuation of the valve stem end are associated with a lifting of the valve head from its valve seat. This movement is countered by the restoring force of a suitably arranged valve spring, which ensures that the valve head is pulled back into its sealing engagement with the valve seat at a suitable time in the engine cycle.
  • ⁇ ⁇ SD 3 P ⁇ - li Ch tr 3 ⁇ h- 1
  • DE 43 39 433 AI describes a valve lever with a deflection device which comprises an adjustment wedge having two wedge surfaces, which is arranged between a support wedge arranged in the valve lever in the adjustment direction of the adjustment wedge and a feed wedge in the valve lever transversely to the adjustment direction of the adjustment wedge in the direction of the gas exchange valve movably guided valve thrust piece is arranged.
  • a deflection device which comprises an adjustment wedge having two wedge surfaces, which is arranged between a support wedge arranged in the valve lever in the adjustment direction of the adjustment wedge and a feed wedge in the valve lever transversely to the adjustment direction of the adjustment wedge in the direction of the gas exchange valve movably guided valve thrust piece is arranged.
  • a mechanical valve lash adjuster is also described in EP 0 331 901 A2, in which a rocker arm interacts with an eccentric disk to eliminate the valve lash.
  • the eccentricity of the eccentric disc is selected so that during the actuating stroke of the valve the gear ratio of the rocker arm is reduced, but after the valve returns to its closed position and the transmission forces cease to exist, the spring swivels the eccentric disc until the valve clearance is eliminated.
  • valve lash adjusting element mentioned at the outset is characterized in that it comprises a hollow cylinder rotatably mounted in the rocker arm with flat surfaces (“sliding block”) formed around the hollow cylinder circumference and a torsion spring rotating the sliding block in a predetermined direction of rotation. Adjacent flat surfaces are separated from one another by their surface edges.
  • the torsion spring for rotating the sliding block in a predetermined direction of rotation has a much lower spring force than the valve spring closing the valve, so that the closing of the valve is not impaired by a force component in the opposite direction of the spring force of the torsion spring.
  • the sliding block is designed such that the flat surfaces formed around the circumference of the hollow cylinder are each arranged parallel to the hollow cylinder axis. This implies that there is a perpendicular to the hollow cylinder axis for each flat surface.
  • the direction of this solder corresponds to a radial direction of the circular cross sections of the hollow cylinder.
  • the solder defines the shortest distance of the flat surface from the hollow cylinder axis by means of a flat surface on the hollow cylinder axis.
  • P tr 0 ⁇ - PP 4 ⁇ - ⁇ - SD ⁇ ⁇ - Q ⁇ 1- "P ⁇ - PP ⁇ - P 3 3 ⁇ PP ⁇ PM! CQ P rt ⁇ H ⁇ ⁇ ⁇ ü P ⁇
  • Ch Mi SD P P ⁇ P ⁇ rt SD: 0 ⁇ Pi li ⁇ P ⁇ P P 0 ⁇
  • 0 SD CQ ⁇ - Q CQ ⁇ rt ⁇ CQ rt li li 0 0 ⁇ ii ⁇ ⁇ - ⁇ ⁇ ⁇ li ⁇ - Pi cd tr Q CQ ⁇ ⁇ "d ⁇ ⁇ > tr ⁇ ⁇ I- 1 ⁇ - Mi tr SD PP ⁇ - P ⁇ - ⁇ ⁇ ⁇ SD ⁇
  • ⁇ SD ü ⁇ ⁇ P CQ rt tr Q Ml tr ⁇ tr • ⁇ Pi ⁇ li ö P • d 0 H ⁇ ⁇ ii ⁇ SD P 4 CQ ⁇ ⁇ CQ ⁇ ⁇ ü SD ⁇ ⁇ SD PN li i rt 0 PJ ü ⁇ - ü tr Ml ⁇ Ch ⁇ CQ N CD et tu l ⁇ - Mi ⁇ - ii Pi P ⁇ ⁇ ⁇ D ⁇ P li tr tr J ⁇ rt ⁇ 0 PJ 0 ⁇ ⁇ rt SD rt ⁇ CQ tr CQ rt PJ ⁇ Ml *
  • the sliding block In the basic setting of the sliding block, it is set so that the flat surface with the smallest shortest distance from the hollow cylinder axis reaches a rotary position for actuating the valve stem.
  • the first predetermined valve clearance is set.
  • the rocker arm is preferably designed in such a way that the torsion spring is a two-mounted helical spring which is arranged around the hollow cylinder axis and has a fixed bearing on the sliding block and the other fixed bearing on the rocker arm. This simplifies the design, saves space and costs.
  • An advantageous embodiment of the invention provides that the rocker arm is equipped with at least four flat surfaces, whereby at least one four times on / adjustment of the first predetermined valve clearance can be detected.
  • the first predetermined valve clearance is the same for each flat surface in its rotational position for actuating the valve stem. This results in repeated readjustment of the valve clearance to the same predetermined value.
  • a constant minimum valve clearance can be set for each readjustment stage.
  • the second predetermined valve clearance is the same for each flat surface in its rotational position for actuating the valve stem. This ensures that a certain valve clearance, which is the same for each flat surface in the rotational position for actuating the valve stem, is not exceeded. In conjunction with a constant first predetermined valve clearance, the valve clearance can thus be kept within the limits defined by the first and the second predetermined valve clearance.
  • the first predetermined valve clearance is preferably in the range from 0.01 mm to 1 mm; this is preferably 0.1 mm.
  • the second predetermined valve clearance preferably has a difference from the first predetermined valve clearance which is in the range of 0.05 mm-1 mm; this is preferably 0.2 mm.
  • An advantageous embodiment of the invention provides that the flat surfaces of the sliding block on both sides 3 3 ⁇ - ⁇ rt ii rt
  • FIG. 1 shows a perspective view of a rocker arm according to the invention in engagement with a valve stem
  • FIG. 2b shows a top view of an enlarged section of the rocker arm according to the invention from FIG. 2a;
  • Fig. 3 shows a cross-sectional view of a first example of the sliding block with seven flat surfaces
  • Fig. 4 shows a cross-sectional view of a second example of the sliding block with nine flat surfaces.
  • a rocker arm 1 is in engagement with the valve stem end of a valve stem 4 via a sliding block 2.
  • the valve stem 4 is slidably arranged in a valve stem guide 6.
  • the valve stem 4 is pressed by a valve spring 8 into a position in which the valve plate 11 comes into sealing engagement with the valve ring 12.
  • the valve spring 8 is supported on the one hand against the cylinder head 13 and on the other hand against a projection 10 attached to the valve stem.
  • the rocker arm 1 is attached to the engine block via a stem 3.
  • the sliding block 2 is rotatably mounted at one end of the rocker arm 1 in a corresponding recess between washers 7.
  • the flat surface remains in engagement with the valve stem end as long as the rear surface edge hurrying in the direction of rotation of the sliding block 2 lies against the valve stem end.
  • the sliding block 2 is only biased by the torsion spring 5 in this state.
  • valve clearance increases in the course of the operating life of the engine, the valve clearance can become so large that it reaches the value of the second predetermined valve clearance at which the rear surface edge no longer abuts the valve stem end.
  • the sliding block is then rotated due to the preloading spring force of the torsion spring until the next flat surface comes into contact with the valve stem by contacting its rear surface edge.
  • the originally increased valve clearance is reduced again by the comparatively larger shortest distance between the flat surfaces and adjusted to the first predetermined valve clearance.
  • valve clearance reaches the value 0.3 mm in the first stage
  • the sliding block rotates to the next surface stage and the output valve clearance of 0.1 mm is immediately obtained again. It is therefore ensured that a minimum there is valve clearance and the valves do not remain open.
  • the torsion spring 5 can be seen as a centrally arranged helical spring which has a fixed bearing on the sliding block 2 and the other fixed bearing in a clutch of the rocker arm 1.
  • the sliding block 2 has the shape of a hollow cylinder with flat surfaces formed around its circumference.
  • the torsion spring 5 is arranged in the hollow center of the hollow cylinder.
  • the sliding block is also equipped with two washers 7 arranged on both sides of the flat surfaces.
  • the sliding block 2 is shown in cross section.
  • the direction of the rotation of the sliding block caused by the torsion spring 5 is indicated by the arrow.
  • the hollow cylinder of the sliding block has the radius x in its circular cross section.
  • the flat surfaces likewise shown in section are formed around the circumference of the hollow cylinder.
  • the intersection lines of the flat surfaces form a closed polygon around the circumference of the hollow cylinder, which moves further and further away from the circumferential surface in the opposite direction of rotation. Only the straight line with the shortest vertical radial distance from the axis of rotation touches the circumferential surface of the hollow cylinder.
  • This line of intersection or the corresponding flat surface of the sliding block is set in the initial basic setting of the sliding block for actuating the valve stem end.
  • the vertical radial distance the line of intersection from the hollow cylinder axis corresponds to the perpendicular of the flat surface to the hollow cylinder axis.
  • the first predetermined valve clearance results from the difference between the vertical distance of the axis of rotation of the hollow cylinder from the end of the valve stem and the shortest distance between the flat surface and the cylinder axis.
  • the first predetermined valve play lies within ie the difference between R x and R J + J.
  • the second predetermined valve clearance corresponds to the difference between the radial distance of the rear surface edge of the flat surface from the cylinder axis and the shortest distance of the flat surface from the cylinder axis. In the basic setting of the sliding block, the second predetermined valve clearance is therefore x .
  • the sliding block jumps to the next rest position, in which the next flat surface in the opposite direction to the direction of rotation comes into engagement with the valve stem end.
  • the second predetermined valve clearance is x 3 .
  • FIG. 3 shows 7 steps or edges as examples.
  • Fig. 4 shows a second example of the sliding block according to the invention with nine flat surfaces. An exact design of the sliding block is given for clarification.
  • the first and second predetermined valve clearances are the same for each flat surface.
  • the first predetermined valve clearance is 0.1 mm. Every time the next flat surface assumes the rotary position for actuating the valve stem, the first predetermined valve clearance of 0.1 mm is readjusted.
  • a valve clearance of 0.1 mm is set.
  • the second predetermined valve clearance is 0.3 mm.
  • the difference between the second predetermined valve clearance and the first predetermined valve clearance is 0.2 mm. After wear of 0.2 mm, each flat surface snaps into the rotary position for actuating the valve stem and reduces the actual valve clearance from 0.3 mm to 0.1 mm again.
  • the angles between the adjacent solders are given by the flat surfaces on the hollow cylinder axis.
  • the hollow cylinder has a length of 14.4 mm, an outer diameter of 7 mm and an inner diameter of 3.7 mm.
  • the flat surfaces have a width along the hollow cylinder axis of 6 mm.
  • the length of the hollow cylinder on both sides of the area occupied by flat surfaces is 4.2 mm in each case.
  • an average service life of 5000 hours can be achieved until the last flat surface engages in the rotary position for actuating the valve stem.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

L'invention concerne un culbuteur monté de manière à basculer et à tourner, pour un mécanisme de distribution de moteur à combustion interne, qui comporte un élément d'ajustement du jeu des soupapes, permettant un ajustement/réajustement automatique d'un premier jeu de soupape prédéterminé entre le culbuteur et l'extrémité de tige de soupape. L'élément d'ajustement du jeu de soupape comprend un cylindre creux monté rotatif dans le culbuteur, avec des surfaces planes (« coulisseau ») formées en périphérie du cylindre creux et un ressort de torsion faisant tourner le coulisseau dans un sens de rotation prédéterminé. La rotation automatique du coulisseau est évitée par application de chacune des arêtes arrière de la surface plane sur l'extrémité de la tige de soupape, tant qu'un second jeu de soupape prédéterminé n'a pas été atteint.
EP02715421A 2001-02-08 2002-01-12 Culbuteur pour mecanisme de distribution de moteur a combustion interne et dispositif d'ajustement/reajustement automatique du jeu des soupapes Expired - Lifetime EP1358397B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10105807A DE10105807C1 (de) 2001-02-08 2001-02-08 Kipphebel für einen Ventiltrieb eines Verbrennungsmotors mit Vorrichtung zur selbsttätigen Ein-/Nachstellung des Ventilspiels
DE10105807 2001-08-02
PCT/EP2002/000251 WO2002063142A1 (fr) 2001-02-08 2002-01-12 Culbuteur pour mecanisme de distribution de moteur a combustion interne et dispositif d'ajustement/reajustement automatique du jeu des soupapes

Publications (2)

Publication Number Publication Date
EP1358397A1 true EP1358397A1 (fr) 2003-11-05
EP1358397B1 EP1358397B1 (fr) 2008-07-02

Family

ID=7673337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02715421A Expired - Lifetime EP1358397B1 (fr) 2001-02-08 2002-01-12 Culbuteur pour mecanisme de distribution de moteur a combustion interne et dispositif d'ajustement/reajustement automatique du jeu des soupapes

Country Status (5)

Country Link
US (1) US6612278B2 (fr)
EP (1) EP1358397B1 (fr)
CN (1) CN1255620C (fr)
DE (2) DE10105807C1 (fr)
WO (1) WO2002063142A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115247582A (zh) * 2021-04-26 2022-10-28 北京福田康明斯发动机有限公司 一种调整发动机气门间隙的方法及装置

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US7883539B2 (en) 1997-01-02 2011-02-08 Edwards Lifesciences Llc Heart wall tension reduction apparatus and method
US6332893B1 (en) 1997-12-17 2001-12-25 Myocor, Inc. Valve to myocardium tension members device and method
US6260552B1 (en) 1998-07-29 2001-07-17 Myocor, Inc. Transventricular implant tools and devices
US6723038B1 (en) 2000-10-06 2004-04-20 Myocor, Inc. Methods and devices for improving mitral valve function
US6764510B2 (en) 2002-01-09 2004-07-20 Myocor, Inc. Devices and methods for heart valve treatment
DE10237560B4 (de) * 2002-08-16 2007-11-08 Man Nutzfahrzeuge Ag Spielfreier Ventiltrieb für eine Brennkraftmaschine
US7112219B2 (en) 2002-11-12 2006-09-26 Myocor, Inc. Devices and methods for heart valve treatment
DE102012001633A1 (de) * 2012-01-30 2013-08-01 Kolbenschmidt Pierburg Innovations Gmbh Mechanisch steuerbare Ventiltriebanordnung
CN107676141A (zh) * 2017-11-15 2018-02-09 宁波里尔汽车技术有限公司 机械式气门间隙调整机构

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US1948063A (en) * 1932-08-17 1934-02-20 Thompson Prod Inc Mechanical clearance regulator
DE621553C (de) * 1933-09-07 1935-11-12 Gen Motors Res Corp Vorrichtung zum Ausgleich des Spiels im Ventilantrieb von Brennkraftmaschinen u. dgl.
US2365401A (en) * 1943-09-17 1944-12-19 Fisk John Edwin Tappet
US2791260A (en) * 1954-04-21 1957-05-07 William I Pixley Guide means for roll straighteners
FR1207052A (fr) * 1957-06-26 1960-02-15 Ford Mécanisme de commande de soupape
FR1207502A (fr) 1958-06-13 1960-02-17 Herman Pneumatic Machine Co Perfectionnements apportés aux procédés et dispositifs pour tasser des moules de fonderie
US3658038A (en) * 1971-01-04 1972-04-25 Johnson Products Inc Tappet for overhead camshaft engine
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EP0331901B1 (fr) * 1988-02-05 1993-11-18 Dieter Voigt Entraînement de soupape pour une soupape à levée
DE4339433A1 (de) * 1993-11-18 1995-05-24 Bayerische Motoren Werke Ag Ventilhebel zur Steuerung eines Gaswechselventils einer Brennkraftmaschine, insbesondere Schlepphebel

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115247582A (zh) * 2021-04-26 2022-10-28 北京福田康明斯发动机有限公司 一种调整发动机气门间隙的方法及装置
CN115247582B (zh) * 2021-04-26 2023-07-21 北京福田康明斯发动机有限公司 一种调整发动机气门间隙的方法及装置

Also Published As

Publication number Publication date
WO2002063142A1 (fr) 2002-08-15
CN1457386A (zh) 2003-11-19
DE50212436D1 (de) 2008-08-14
US6612278B2 (en) 2003-09-02
CN1255620C (zh) 2006-05-10
DE10105807C1 (de) 2002-05-08
US20030029404A1 (en) 2003-02-13
EP1358397B1 (fr) 2008-07-02

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