EP0389609B1 - Vorrichtung zur betätigung der ventile an verbrennungsmotoren mit veränderlicher ventilerhebungskurve - Google Patents

Vorrichtung zur betätigung der ventile an verbrennungsmotoren mit veränderlicher ventilerhebungskurve Download PDF

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Publication number
EP0389609B1
EP0389609B1 EP89910856A EP89910856A EP0389609B1 EP 0389609 B1 EP0389609 B1 EP 0389609B1 EP 89910856 A EP89910856 A EP 89910856A EP 89910856 A EP89910856 A EP 89910856A EP 0389609 B1 EP0389609 B1 EP 0389609B1
Authority
EP
European Patent Office
Prior art keywords
joint
cam
casing
intermediate member
driven member
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
Application number
EP89910856A
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German (de)
English (en)
French (fr)
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EP0389609A1 (de
Inventor
Peter Kuhn
Helmut Schön
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Publication of EP0389609A1 publication Critical patent/EP0389609A1/de
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Publication of EP0389609B1 publication Critical patent/EP0389609B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/12—Transmitting gear between valve drive and valve
    • 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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0015—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque
    • F01L13/0063—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for optimising engine performances by modifying valve lift according to various working parameters, e.g. rotational speed, load, torque by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot

Definitions

  • the invention relates to a device for actuating the valves on internal combustion engines with a variable valve lift curve according to the preamble of patent claim 1.
  • a four-part adjusting or regulating gear is known from US 3,413,965.
  • Such a circulatory gear consists of a valve-guiding housing, a rotating cam connected to the housing via a swivel joint, the drive of which is derived from the crankshaft, an intermediate member actuated by the cam via a first cam joint and an output member which, on the one hand, has a joint supported on the housing, on the other is operatively connected to the intermediate link via a joint and which transmits the movement to the valve.
  • the intermediate link is designed as a rocker arm, which is supported on the housing via a second cam joint, the cam of the second cam joint arranged on the intermediate link having a section forming a detent and a control section.
  • the position of the curve supported on the housing and belonging to the second curve joint can be adjusted during operation.
  • the force emanating from the cam is deflected by approximately 180 ° to actuate the valve by the rocker arm, which acts as a flexible beam. This results in a particularly high load in the curve joint between the intermediate member and the housing and a relatively large flexibility of the transmission due to the indirect flow of force. After all, this transmission requires a large installation space in the cylinder head width of a reciprocating piston engine.
  • the invention has for its object to develop a device of the type mentioned in such a way that the size of the valve train is reduced and its overall rigidity is increased.
  • the intermediate member is essentially triangular, one side of which forms part of the first cam joint with the cam, the second side of which forms part of the second cam joint with the housing and the third side of which forms part of the joint with the output member.
  • the device according to the invention has three moving components during operation, namely the rotating cam, the intermediate member and the output member.
  • the second cam joint with which the intermediate member is supported on the housing or the swivel joint of the cam can be set to determine the valve opening times or the valve lift curve. These are determined by the curve arranged on the intermediate link as part of the second curve joint supporting the intermediate link in the housing, this curve having a latching or control section.
  • the housing-side curve of the second curve joint which interacts with the curve on the intermediate link, is formed by a cylindrical surface.
  • this can be a cylindrical bolt or a roll capable of circulation.
  • the device according to the invention is distinguished from the prior art mentioned at the outset by improved rigidity.
  • the forces acting in the curve joints are lower and the friction losses can also be reduced.
  • the device can be designed to save space in terms of design, so that short, direct force paths can be achieved with little construction effort.
  • the joint between the intermediate member and the output member and between this and the housing in each case is designed as a swivel joint.
  • Such a device represents a particularly wear-resistant arrangement due to its two swivel joints.
  • Another embodiment is characterized in that the joint between the intermediate member and the driven member is designed as a swivel joint and the joint between the driven member and the housing is designed as a thrust joint.
  • the swivel joint between the intermediate member and the output member can be formed by preferably circular sliding surfaces, while the thrust joint between the output member and the housing can be realized in that the output member is guided in a linearly displaceable manner in the housing.
  • the design is advantageously made such that the curve section which is arranged on the intermediate member and forms the detent is formed by a circular arc whose center coincides with the center of rotation of the swivel joint between the intermediate member and the output member.
  • the aforementioned embodiments give the possibility that the curve supported on the housing is adjustable in such a way that its point of contact with the curve section on the intermediate link moves on a circular arc with the center of rotation of the swivel joint between the intermediate link and the output link.
  • the design can be such that the curve supported on the housing is adjustable on a circular arc with the center of rotation of the swivel joint between the intermediate member and the output member.
  • the movement necessary for the control is designed as a rotary movement, which can be implemented particularly simply in terms of construction.
  • the thrust joint between the driven member and the intermediate member is a sliding surface, while the driven member is supported on the housing via a structurally simple swivel joint.
  • the joint between the intermediate member and the output member and between this and the housing is designed as a sliding joint.
  • the curve supported on the housing is preferably adjustable in such a way that its point of contact with the curve section on the intermediate link runs parallel to the plane of the thrust joint, the curve itself being adjustable in this way in the simplest embodiment.
  • the driven member in the embodiments in which the driven member is supported on the housing via a swivel joint, can be designed as a lever, for example as a rocker arm or rocker arm, while in the cases in which it is supported on the housing by means of sliding joints, for example can be designed as a tappet which engages over the valve stem at its end.
  • the design is such that a device for automatic compensation of the valve clearance is arranged on one of the transmission members or between the output member and the valve stem.
  • FIGS. 1 to 4 each in a partially sectioned side view in the region of the outer end of a valve stem.
  • the housing 1 with the stem 2 of a valve that is not shown completely and a valve spring 3 seated on the stem can be seen.
  • the valve is driven by a cam 5 guided in the swivel joint 4, which, like the housing 1, is part of a four-membered transmission, the other two parts of which are formed by an intermediate member 6 and an output member 7.
  • the intermediate member 6 is supported on the housing via a second cam joint 8.
  • the curve joint 8 has a curve 9 on the intermediate member on the one hand, and a curve 10 supported on the housing on the other hand, which in all exemplary embodiments is formed by a cylindrical surface, for example a bolt seated in the housing 1, a roller or the like.
  • the cam 5 forms a first cam joint 28 with the intermediate member 6, which on the one hand by the control curve 11 of the cam 5, on the other hand is formed by, for example, a flat surface 12 on the intermediate member 6.
  • the intermediate member 6 is connected to the output member 7 via a swivel joint 13. Furthermore, the output member 7, which is designed as a rocker arm 14, is supported on the housing 1 via a swivel joint 15. The rocker arm 14 acts on the valve stem 2 with its end remote from the swivel joint 15.
  • the movement of the cam 5 is transmitted in the first cam joint 28 to the intermediate member 6, which pivots about the swivel joint 13 and at the same time is supported on the cylindrical surface 10 of the bolt 16. This support leads to a pivoting movement of the rocker arm 14 around the swivel joint 15, which is finally transmitted into a lifting movement of the valve stem 2.
  • the curve 9 on the intermediate member 6 has two sections, one section 17 of which forms a catch. This curve section forms a circular arc with the swivel joint 13 as the center. As long as the section 17 is in operative connection with the cylinder surface 10, no valve lift takes place.
  • the curve 9 also has a curve section 18 which acts as a control section and which brings about the valve lift.
  • a curve section 18 which acts as a control section and which brings about the valve lift.
  • the intermediate member 6 is substantially triangular, one side forming the flat surface 12 cooperating with the cam 5 and the other side forming a curve of the cam joint 8, while the third side is the swivel joint 13, which Intermediate member 6 connects to the output member 7.
  • the intermediate member 6 is again triangular.
  • the cam joint 28 between the cam 5 and the intermediate member 6 is designed in the same way as in the exemplary embodiment according to FIG. 1.
  • the intermediate member 6 is in turn supported on the housing via the cylindrical surface 10 of the bolt 16.
  • a swivel joint 13 is provided between the intermediate member 6 and the driven member 7, but is designed here in a different way than in the exemplary embodiment according to FIG. 1. It consists namely of a cylindrical surface 20 on one side of the triangular intermediate member 6 and a cylindrical surface 21 on the driven member 7. Instead of the cylindrical surface 21, a spherical surface can also be provided on the driven member 7.
  • the output member 7 is supported on the housing 1 via a sliding joint 22.
  • the output member 7 is designed as a cup tappet 23, which engages over the outer end of the valve stem 2 and sits in a sliding guide on the housing 1.
  • the intermediate member 6 in turn forms a cam joint 8 with the cylinder surface 10 and for this purpose has the cam 9 with the section 17 forming the catch and the control section 18.
  • the section 17 forming the detent runs in a circular arc with the center of rotation of the swivel joint 13 as the center point, which is indicated in FIG. 2 by a cross.
  • the valve opening times and the valve lift are changed again by adjusting of the bolt 16 on an arc in the direction of the double arrow 19, the center of which also coincides here with the center of rotation of the swivel 13.
  • the exemplary embodiment according to FIG. 3 in turn has a triangular intermediate member 6, which, however, in contrast to the aforementioned exemplary embodiments, is connected to the driven member 7 via a sliding joint 24, which is formed by flat sliding surfaces on the intermediate member 6 and on the driven member 7.
  • the output member 7 is in turn supported on the housing 1 via a swivel joint 15 and is also effective as a rocker arm 14.
  • the curve 9 cooperating with the cylindrical surface 10 of the bolt 16 on the intermediate member 6 has a linear section 25 and a curved section 26.
  • a thrust joint 24 is also provided between the latter and the driven member 7, which is formed by linear sliding surfaces between these two members.
  • the output member 7 is, however, in a modification compared to Figure 3 and similar to Figure 2 as a tappet 23 which engages over the upper end of the valve stem 2 with the valve spring 3.
  • the curve 9 forming part of the curve joint 8 between the intermediate member 6 and the housing 1 in turn has a linear section 25 as a catch and a control section 26.
  • valve opening times and valve lift are determined by linearly adjusting the bolt 16 in accordance with the double arrow 27.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP89910856A 1988-10-01 1989-09-28 Vorrichtung zur betätigung der ventile an verbrennungsmotoren mit veränderlicher ventilerhebungskurve Expired - Lifetime EP0389609B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3833540A DE3833540A1 (de) 1988-10-01 1988-10-01 Vorrichtung zur betaetigung der ventile an verbrennungsmotoren mit veraenderlicher ventilerhebungskurve
DE3833540 1988-10-01

Publications (2)

Publication Number Publication Date
EP0389609A1 EP0389609A1 (de) 1990-10-03
EP0389609B1 true EP0389609B1 (de) 1993-05-26

Family

ID=6364251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89910856A Expired - Lifetime EP0389609B1 (de) 1988-10-01 1989-09-28 Vorrichtung zur betätigung der ventile an verbrennungsmotoren mit veränderlicher ventilerhebungskurve

Country Status (4)

Country Link
US (1) US5119773A (enrdf_load_stackoverflow)
EP (1) EP0389609B1 (enrdf_load_stackoverflow)
DE (2) DE3833540A1 (enrdf_load_stackoverflow)
WO (1) WO1990003497A1 (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7044094B2 (en) 2002-12-27 2006-05-16 Gerlinde Bosl-Flierl Valve-lift device for the variable control of gas-exchange valves of an internal combustion engine
CN106523067A (zh) * 2016-12-20 2017-03-22 江苏三能动力总成有限公司 一种发动机连续可变气门升程结构

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WO1993008377A1 (de) * 1991-10-25 1993-04-29 Peter Kuhn Vorrichtung zur betätigung der ventile in verbrennungsmotoren mittels umlaufender nocken
DE4135257C2 (de) * 1991-10-25 1998-09-03 Peter Prof Dr Ing Kuhn Vorrichtung zur Betätigung der Ventile in Verbrennungsmotoren mittels umlaufender Nocken
US5456224A (en) * 1991-12-03 1995-10-10 Motive Holdings Limited Variable valve lift mechanism for internal combustion engine
US5365895A (en) * 1991-12-03 1994-11-22 Motive Holdings Limited Variable valve lift mechanism for internal combustion engine
DE4209062C1 (enrdf_load_stackoverflow) * 1992-03-20 1993-04-01 Mercedes-Benz Aktiengesellschaft, 7000 Stuttgart, De
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DE4308582C2 (de) * 1993-03-18 1997-02-20 Peter Prof Dr Ing Kuhn Ventilsteuerung zur Erhöhung der Ansaugtemperatur beim Kaltstart von Verbrennungsmotoren
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DE10164493B4 (de) 2001-12-29 2010-04-08 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Vorrichtung zur variablen Betätigung der Ladungswechselventile in Hubkolbenmotoren
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FR2839112A1 (fr) 2002-04-26 2003-10-31 Roger Lecal Mecanisme de distribution a levee angle d'ouverture calage et nombre de soupapes variables et moteur a combustion interne disposant de ce mecanisme
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DE10339658B4 (de) * 2003-08-26 2019-03-28 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Einrichtung zur variablen Betätigung von Ventilen mittels Nocken für Verbrennungsmotoren
DE10342075A1 (de) * 2003-09-10 2005-06-16 Rolf Jung Vollvariable Hubventilsteuerung einer Brennkraftmaschine
US6997433B2 (en) * 2004-01-21 2006-02-14 Ford Global Technologies, Llc Electronic valve actuator having vibration cancellation
US7314026B2 (en) 2004-01-21 2008-01-01 Ford Global Technologies, Llc Electronic valve actuator having hydraulic displacement amplifier
DE102006003002B3 (de) 2006-01-23 2007-03-08 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb für Ladungswechselventile von Verbrennungsmotoren
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7044094B2 (en) 2002-12-27 2006-05-16 Gerlinde Bosl-Flierl Valve-lift device for the variable control of gas-exchange valves of an internal combustion engine
CN106523067A (zh) * 2016-12-20 2017-03-22 江苏三能动力总成有限公司 一种发动机连续可变气门升程结构

Also Published As

Publication number Publication date
EP0389609A1 (de) 1990-10-03
WO1990003497A1 (de) 1990-04-05
DE58904505D1 (de) 1993-07-01
DE3833540C2 (enrdf_load_stackoverflow) 1991-08-01
US5119773A (en) 1992-06-09
DE3833540A1 (de) 1990-04-12

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