EP3164580B1 - Ventiltrieb mit einem schiebenockenelement - Google Patents

Ventiltrieb mit einem schiebenockenelement Download PDF

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Publication number
EP3164580B1
EP3164580B1 EP15732716.4A EP15732716A EP3164580B1 EP 3164580 B1 EP3164580 B1 EP 3164580B1 EP 15732716 A EP15732716 A EP 15732716A EP 3164580 B1 EP3164580 B1 EP 3164580B1
Authority
EP
European Patent Office
Prior art keywords
cam profile
cam
rollers
valve
profile sections
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.)
Active
Application number
EP15732716.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3164580A1 (de
Inventor
Ulf MÜLLER
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.)
Thyssenkrupp Dynamic Components Teccenter AG
Original Assignee
ThyssenKrupp Presta TecCenter AG
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 ThyssenKrupp Presta TecCenter AG filed Critical ThyssenKrupp Presta TecCenter AG
Publication of EP3164580A1 publication Critical patent/EP3164580A1/de
Application granted granted Critical
Publication of EP3164580B1 publication Critical patent/EP3164580B1/de
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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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • 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
    • F01L1/042—Cam discs
    • 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
    • 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
    • F01L1/185—Overhead end-pivot rocking arms
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction
    • F01L2013/0052—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction with cams provided on an axially slidable sleeve
    • 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
    • F01L2305/00—Valve arrangements comprising rollers

Definitions

  • the present invention relates to a valve train with a sliding cam element which is axially displaceably received on a support shaft in an axis of rotation of the support shaft and which has at least one cam profile group with mutually differently shaped cam profile sections and a tapping element, via which a control movement tapped from the cam profile sections and a Valve is transferable.
  • the DE 10 2007 010 155 A1 shows a valve train with a sliding cam element arranged on a support shaft and the sliding cam element can be axially displaced in the axis of rotation of the support shaft.
  • a cam profile group is applied, which has different cam profile sections.
  • a tapping element represented as a roller rocker arm, can interact with differently contoured cam profile sections of the cam profile group, so that the valve is actuated in dependence on the selected cam profile section.
  • the cam profile sections may be contoured differently so that the valve can perform different sized or different long opening strokes.
  • the roller rocker arm has a roller, and on the side facing away from the valve, the roller rocker arm is supported via a valve clearance compensation element.
  • the switching times between different cam profile sections extend in operative connection with the tapping element due to a widely-executed displacement element, with the fundamental intention of providing a valve drive in which the cam profile sections can be changed as quickly as possible in contact with the tapping element.
  • the sliding cam element must be moved in very short times axially between at least two positions, so that a narrow-build design of a sliding cam element would be effective.
  • the DE 10 2007 020 128 A1 shows a pick-off element with two rollers which are in contact with a single cam element.
  • the two spaced-apart rollers cause a guide a recording rocker, which rests in a cam follower and allows a tilt compensation of the cam follower relative to the cam member.
  • the object of the invention is the development of a valve train with a sliding cam element, on a support shaft which can be moved in the direction of rotation of the carrier shaft with short switching times between different axial positions.
  • the displacement length should be shortened in the direction of rotation axis, without premature wear of the valve train occurs.
  • the invention includes the technical teaching that at least two mutually identical cam profile groups are formed on the sliding cam element, which cooperate for the common control of a valve with a single tap element.
  • the invention is based on the idea of dividing a required contact width between the cam profile sections of a cam profile group with a tapping element in two individual widths.
  • a twin sliding cam member is formed, and the displacement speed of the sliding cam member in the rotation axis direction is considerably increased due to the shortened path.
  • the switching of the sliding cam element can also take place at higher rotational speeds of the camshaft, since the displacement length of the sliding cam element on the carrier shaft is shortened.
  • the paired cam profile sections need not necessarily have half the width, which has a common cam profile section with a single contact between the cam profile section and a tap element for controlling a valve.
  • An approximate halving is, however, possible because it allows the width of the cam profile group can be approximately halved, while always two individual lines of contact between the Abgriffselement and the sliding cam element on separately arranged cam profile sections are present, so that each transferable with a contact forces per cam profile section are approximately halved.
  • Over the line contact between the cam profile section and the tap element results in a line load, which is approximately equal to a conventional tap by a tap element with a continuous, single contact line.
  • the tapping element may comprise at least two rollers, wherein a first roller cooperates with the cam profile sections of a first cam profile group and wherein a second roller cooperates with the cam profile sections of a second cam profile group.
  • the cam profile groups can be formed adjacent and adjacent to each other on the sliding cam element, so that the sliding cam element does not widen unnecessarily.
  • the rollers on the tapping element can be received in a common roller axis and have a same diameter to each other.
  • the tapping element can be designed as a drag lever, in particular as a roller finger follower, and the two rollers can be mounted parallel to one another on a common axis.
  • the rollers may cooperate with cam profile sections which have a cam contour which is identical to one another, and a gap which is so large that it corresponds at least to the width of a cam profile section or two cam profile sections of a cam profile group may be formed between the rollers on the tapping element. If the cam profile group has, for example, three different cam profile sections, then the gap between the rollers must be at least so wide that two further cam profile sections that are temporarily not in contact with the tapping element can be inserted between the rollers.
  • the cam profile sections may have a common cam base circle section which in particular has a diameter which is the same across the width of the sliding cam element.
  • the sliding cam member may be integrally formed with the two cam profile groups, wherein the two cam profile groups also form a first contact portion with a first tap element, and another pair of cam profile groups may be mounted on the same slide cam element which controls a further valve via a further tap element.
  • valve drive 1 is shown with the features essential to the invention in second side views and in a perspective view.
  • the valve drive 1 has a sliding cam element 10, which is designed in one piece and is received on a support shaft 11 in a rotational axis 12 axially displaceable.
  • the support shaft 11 is shown only in sections, and the sliding cam member 10 may be provided not shown in detail means to move it in the rotation axis direction.
  • cam profile groups 13 On the sliding cam element 10, two mutually identically formed cam profile groups 13 are formed.
  • the cam profile groups 13 point for example, three cam profile sections 14, wherein a cam profile section 14 are designed as Nullhubnocke and two other cam profile sections 14 with different lifting heights.
  • the cam profile sections 14 adjoin one another in the axial direction.
  • a tapping element 15 cooperates, which transmits the lifting information of the cam profile groups 13 to a valve 16.
  • the valve 16 is further shown with a valve spring 21, and on the opposite side of the valve 16 of the Abgriffsiatas 15 is a support member 20 which can serve as a valve clearance compensation element and on which the tapping element 15 is supported.
  • the tapping element 15 is executed in the illustrated embodiment as a roller cam followers with rollers 17 which are received in a common roller axle 18 on the main body of the tapping element 15.
  • the rollers 17 are received at a distance from each other on the tapping element 15 and the distance corresponds to the distance of two equally executed cam profile sections 14 from the respective cam profile groups 13 of the sliding cam element 10. This creates a twin contact between the tapping element 15 and the sliding cam element 10th
  • the cam profile sections 14 of the cam profile groups 13 are designed with a width B which is smaller than a required width of cam profile sections 14 when they form the tap contact for controlling a valve 16 with one of the two rollers 17.
  • the width B of the cam profile sections 14 may be about half as large as a width of cam profile sections that form a single contact with a tapping element 15.
  • the rollers 17 may have a width which is about half as large as a width that would be required if only one roller 17 of a tapping element 15 is in contact with a cam profile section 14 and picks up a lifting movement thereof.
  • the sliding cam member 10 has an overall width substantially equal to a total width of a sliding cam member 10 having conventionally formed cam profile groups 13, the required axial displacement of the sliding cam member 10 in the rotational axis direction is smaller since the cam profile portions 14 are narrower and thus reduced also the way in the direction of rotation axis, by which the sliding cam member 10 must be displaced to make a change of the tap of the rollers 17 between different cam profile sections 14.
  • the actuating forces of the tapping element 15, which are caused by the cam profiles of the cam profile sections 14, are divided into equally formed cam profile sections 14 in contact with the two rollers 17 in equal parts. This creates a line load in the line of contact between the rollers 17 and the cam profile sections 14 which is the same as if only one roller 17 were made wider, and cooperated with a single cam profile section 14 of an individual cam contour. Due to the smaller Axialweg for adjusting the sliding cam member 10, a change of cam profile sections 14 in contact with the roller 17 can be done faster, the change must always be made when the roller 17 is in contact with the Nockengrund Vietnameseabêt 19, on the cam profile groups 13th opposite side of the sliding cam element 10 is present. Thus, the sliding cam member 10 can be adjusted even at higher speeds of the valve train 1, for example, above 4000 1 / min.
  • the invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.

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)
EP15732716.4A 2014-07-02 2015-07-01 Ventiltrieb mit einem schiebenockenelement Active EP3164580B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014109243.0A DE102014109243B3 (de) 2014-07-02 2014-07-02 Ventiltrieb mit einem Schiebenockenelement
PCT/EP2015/064930 WO2016001274A1 (de) 2014-07-02 2015-07-01 Ventiltrieb mit einem schiebenockenelement

Publications (2)

Publication Number Publication Date
EP3164580A1 EP3164580A1 (de) 2017-05-10
EP3164580B1 true EP3164580B1 (de) 2018-09-12

Family

ID=53496722

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15732716.4A Active EP3164580B1 (de) 2014-07-02 2015-07-01 Ventiltrieb mit einem schiebenockenelement

Country Status (5)

Country Link
US (1) US10711664B2 (zh)
EP (1) EP3164580B1 (zh)
CN (1) CN106471223B (zh)
DE (1) DE102014109243B3 (zh)
WO (1) WO2016001274A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016204892A1 (de) * 2016-03-23 2017-09-28 Mahle International Gmbh Ventiltrieb für eine Brennkraftmaschine
DE102016204889A1 (de) * 2016-03-23 2017-09-28 Mahle International Gmbh Ventiltrieb für eine Brennkraftmaschine
DE102018123030A1 (de) * 2018-09-19 2020-03-19 Thyssenkrupp Ag Schiebenockenelement, Ventiltrieb, Verbrennungsmotor, Verwendung und Verfahren zur Steuerung von Ventilen

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2753197A1 (de) * 1976-12-15 1978-06-22 Eaton Corp Ventilsteuervorrichtung
US4516542A (en) * 1982-06-02 1985-05-14 Nissan Motor Co., Ltd. Valve operation changing system of internal combustion engine
DE4142197A1 (de) * 1991-12-20 1993-04-08 Daimler Benz Ag Kipphebelanordnung fuer einen ventiltrieb mit variabler ventilbetaetigungszeit bei brennkraftmaschinen
DE102006058093A1 (de) * 2006-12-09 2008-06-12 Schaeffler Kg Ventiltrieb
DE102007010155A1 (de) * 2007-03-02 2008-09-04 Audi Ag Ventiltrieb einer Brennkraftmaschine mit dreistufigen Nockenprofilgruppen
DE102007020128A1 (de) * 2007-04-28 2008-10-30 Schaeffler Kg Ventiltrieb mit positionsausgeglichenen Abstützelementen für einen Nockenfolger
DE102010005790B4 (de) * 2010-01-25 2012-03-15 Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr Ventiltrieb zur Betätigung von Gaswechselventilen von Brennkraftmaschinen
DE102010011828A1 (de) * 2010-03-18 2011-09-22 Schaeffler Technologies Gmbh & Co. Kg Schaltbarer Hebel für einen Ventiltrieb einer Brennkraftmaschine
DE102012103751B4 (de) * 2012-04-27 2023-06-15 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Brennkraftmaschine und Ventiltrieb für eine Brennkraftmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
DE102014109243B3 (de) 2015-11-12
US20170138231A1 (en) 2017-05-18
CN106471223A (zh) 2017-03-01
EP3164580A1 (de) 2017-05-10
CN106471223B (zh) 2020-03-24
WO2016001274A1 (de) 2016-01-07
US10711664B2 (en) 2020-07-14

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