DE10121798A1 - Valve gear for internal combustion engine has valve operating element with rotatably mounted stepped roller with center section of larger diameter and edge sections on both sides with smaller diameter - Google Patents

Valve gear for internal combustion engine has valve operating element with rotatably mounted stepped roller with center section of larger diameter and edge sections on both sides with smaller diameter

Info

Publication number
DE10121798A1
DE10121798A1 DE10121798A DE10121798A DE10121798A1 DE 10121798 A1 DE10121798 A1 DE 10121798A1 DE 10121798 A DE10121798 A DE 10121798A DE 10121798 A DE10121798 A DE 10121798A DE 10121798 A1 DE10121798 A1 DE 10121798A1
Authority
DE
Germany
Prior art keywords
roller
cam
valve
combustion engine
internal combustion
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.)
Withdrawn
Application number
DE10121798A
Other languages
German (de)
Inventor
Stefan Dengler
Murat Serifsoy
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Priority to DE10121798A priority Critical patent/DE10121798A1/en
Publication of DE10121798A1 publication Critical patent/DE10121798A1/en
Withdrawn legal-status Critical Current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
    • 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/18—Rocking arms or levers
    • 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
    • F01L2305/02—Mounting of rollers

Abstract

The valve gear for an internal combustion engine with a camshaft and at least one cam has a valve operating element with a rotatably mounted roller running onto the cam. The roller in the region of the bearing bore (24d) is designed wider than in the region of its running surface (24a). The roller is therefore stepped, with a center section of larger diameter and edge sections (24b,24c) on both sides with a smaller diameter. The center section corresponds approximately to the width of the cam (12,14) and the edge sections are about 30 per cent of the width.

Description

Die Erfindung betrifft einen Ventiltrieb für eine Brennkraftmaschine, mit einer Nockenwelle mit zumindest einem Nocken und einem Ventilbetätigungsele­ ment mit einer drehbar gelagerten Rolle, die an dem Nocken anläuft.The invention relates to a valve train for an internal combustion engine, with a Camshaft with at least one cam and one valve actuating element ment with a rotatably mounted roller that runs against the cam.

Einen derartigen Ventiltrieb zeigt beispielsweise die DE 100 54 623 A1 mit Rollenschlepphebeln als Ventilbetätigungselemente. Insbesondere bei Mehr­ ventilmotoren (z. B. vier oder fünf Ventile je Zylinder der Brennkraftmaschine) ergeben sich zwangsläufig sehr schmale Nacken und damit verbunden hohe spezifische Flächenpressungen und Freigangprobleme des Ventiltriebs.Such a valve train is shown, for example, in DE 100 54 623 A1 Roller rocker arms as valve actuators. Especially with more valve motors (e.g. four or five valves per cylinder of the internal combustion engine) this inevitably results in very narrow necks and the resulting high ones specific surface pressures and clearance problems of the valve train.

Aufgabe der Erfindung ist es, mit einfachen Mitteln einen verbesserten Ven­ tiltrieb der gattungsgemäßen Art vorzuschlagen.The object of the invention is to provide an improved Ven with simple means propose a til drive of the generic type.

Diese Aufgabe wird erfindungsgemäß mit den kennzeichnenden Merkmalen des Patentanspruches 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind den weiteren Patentansprüchen entnehmbar.This object is achieved with the characterizing features of claim 1 solved. Advantageous developments of the invention can be found in the further claims.

Erfindungsgemäß wird vorgeschlagen, die Rolle des Ventilbetätigungsele­ mentes, z. B. eines Schlepphebels oder Kipphebels, im Bereich der Lager­ bohrung breiter als im Außenumfangsbereich auszubilden und somit die spezifische Flächenpressung an der Lagerung der Rolle (z. B. Nadellage­ rung) zu vermindern. Insbesondere durch eine gestufte Ausbildung der Rolle können zudem Freigangprobleme mit benachbarten Nocken bei Mehrventil­ motoren und/oder umschaltbaren Nocken (z. B. zur Aktivierung unterschied­ licher Ventilhübe) behoben werden.According to the invention, the role of the valve actuating element is proposed mentes, e.g. B. a rocker arm or rocker arm, in the area of the bearings drill hole wider than in the outer peripheral area and thus the specific surface pressure on the bearing of the roll (e.g. needle position tion). In particular through a staged training of the role can also have clearance problems with adjacent cams with a multi-valve motors and / or switchable cams (e.g. differentiated for activation valve strokes).

Ein Ausführungsbeispiel der Erfindung ist im folgenden mit weiteren Einzel­ heiten näher erläutert. Die schematische Zeichnung zeigt einen teilweisen Längsschnitt durch eine Nockenwelle und einen Schlepphebel mit einer na­ delgelagerten Rolle als Ventilbetätigungselement.An embodiment of the invention is in the following with further details explained in more detail. The schematic drawing shows a partial Longitudinal section through a camshaft and a rocker arm with a na roller bearing as valve actuating element.

Die nur abschnittsweise dargestellte Nockenwelle 10 einer mehrzylindrigen Hubkolben-Brennkraftmaschine ist in bekannter Weise in einem nicht darge­ stellten Zylinderkopf drehbar gelagert und trägt je Zylinder mehrere Nocken 12, 14. Die Nocken 12, 14 sind auf der Nockenwelle 10 über eine nicht darge­ stellte Vorrichtung axial verschiebbar geführt und in Drehrichtung form­ schlüssig über eine in eine Nut 16 eingreifende Passfeder 18 gehalten.The camshaft 10 shown only in sections of a multi-cylinder reciprocating piston internal combustion engine is rotatably supported in a known manner in a cylinder head not shown and carries several cams 12 , 14 per cylinder. The cams 12 , 14 are guided axially displaceably on the camshaft 10 via a device not shown and are held in a form-fitting manner in the direction of rotation via a key 18 engaging in a groove 16 .

Unterhalb der Nockenwelle 10 ist ein Schlepphebel 20 angeordnet, der eine­ nends am nicht dargestellten Zylinderkopf schwenkbeweglich abgestützt ist und andernends auf ein Hubventil, z. B. ein Einlassventil, wirkt. Im mittleren Bereich trägt der Schlepphebel 20 über einen Lagerbolzen 22 eine Rolle 24, die über eine Lagerbohrung 24d und unter Zwischenschaltung von Nadeln 26 auf dem Bolzen 22 drehbar gelagert ist.Below the camshaft 10 , a rocker arm 20 is arranged, which is pivotally supported at one end on the cylinder head, not shown, and at the other end on a globe valve, for. B. an inlet valve acts. In the middle area of the drag lever 20 carries a bearing pin 22, a roller 24 is rotatably supported by a bearing hole 24 d and with the interposition of needles 26 on the bolt 22nd

Die Rolle 24 läuft mit ihrem mittleren Bereich 24a größeren Außendurchmes­ sers an dem Außenumfang der Nocken 14 an, wobei die Breite deren An­ lauffläche wie ersichtlich etwa gleich der Nockenbreite ist.The roller 24 runs with its central region 24 a larger outer diameter sers on the outer circumference of the cams 14 , the width of the running surface of which, as can be seen, is approximately equal to the cam width.

Ferner weist die Rolle 24 beiderseits des mittleren Bereiches 24a liegende, abgestufte Randbereiche 24b, 24c auf, die einen geringeren Außenumfang bzw. Außendurchmesser besitzen. Die Breite der Randbereiche 24b, 24c be­ trägt jeweils etwa 30% der Breite des mittleren Bereiches 24a.Further, the roller 24 on either side of the central portion 24 a located stepped edge portions 24 b, 24 c, which have a smaller external circumference or outer diameter. The width of the edge areas 24 b, 24 c each is about 30% of the width of the central area 24 a.

Dementsprechend ist die Rolle 24 - wie ohne weiteres ersichtlich - im Be­ reich ihrer Lagerbohrung 24d deutlich breiter als im Bereich ihres Außenum­ fanges bzw. ihrer Anlauffläche 24a. Es versteht sich, dass dadurch die spe­ zifische Flächenpressung an der Lagerbohrung 24d bzw. an den Nadeln 26 der Lagerung der Rolle 24 entsprechend vermindert ist.Accordingly, the roller 24 - as can be seen readily - in the loading area of its bearing bore 24 d is significantly wider than in the area of its outer circumference or its contact surface 24 a. It is understood that the specific surface pressure on the bearing bore 24 d or on the needles 26 of the bearing of the roller 24 is accordingly reduced.

Ferner ist die Durchmesserdifferenz zwischen den Randbereichen 24b, 24c und dem mittleren Bereich 24a geringfügig größer als die Durchmesserdiffe­ renz der von den Nockenspitzen 12a, 14a der Nocken 12, 14 beschriebenen Hüllkreise D1 und D2. Dadurch ist sichergestellt, dass bei einem Verschieben bzw. Umschalten des Nockenpaares 12, 14 auf der Zeichnung nach rechts und einem entsprechenden Ineingriff kommen des Nockens 12 mit der Rolle 24 ein ausreichender Freiraum für den größeren Hüllkreis D2 der Nocken­ spitze 14a gegeben ist. Die Nockenspitze 14a kann dann mit geringem Ab­ stand an dem Randbereich 24c der Rolle 24 vorbeilaufen.Furthermore, the diameter difference between the edge regions 24 b, 24 c and the central region 24 a is slightly larger than the difference in diameter of the enveloping circles D1 and D2 described by the cam tips 12 a, 14 a of the cams 12 , 14 . This ensures that when moving or switching the pair of cams 12 , 14 in the drawing to the right and a corresponding engagement of the cam 12 with the roller 24 there is sufficient clearance for the larger enveloping circle D2 of the cam tip 14 a. The cam tip 14 a can then pass with little from the edge region 24 c of the roller 24 .

Die Erfindung ist nicht auf das beschriebene Ausführungsbeispiel be­ schränkt. Bei der Verwendung von drei Nocken unterschiedlicher Konfigura­ tion könnte auch ein dritter Hüllkreis D3 hinsichtlich des erforderlichen Frei­ raumes berücksichtigt werden. Die Rolle 24 könnte anstelle der gestuften Ausführung auch konisch sich verjüngende Randbereiche aufweisen, sofern der für den Ventiltrieb erforderliche Freiraum dies zulässt.The invention is not limited to the described embodiment. When using three cams of different configurations, a third enveloping circle D3 could also be taken into account with regard to the required free space. Instead of the stepped design, the roller 24 could also have conically tapering edge regions, provided that the clearance required for the valve train allows this.

Claims (4)

1. Ventiltrieb für eine Brennkraftmaschine, mit einer Nockenwelle mit zumin­ dest einem Nocken und einem Ventilbetätigungselement mit einer dreh­ bar gelagerten Rolle, die an dem Nocken anläuft, dadurch gekennzeich­ net, dass die Rolle (24) im Bereich ihrer Lagerbohrung (24d) breiter als im Bereich ihrer Anlauffläche (24a) ausgeführt ist.1. Valve train for an internal combustion engine, with a camshaft with at least one cam and a valve actuating element with a rotatably mounted roller that starts at the cam, characterized in that the roller ( 24 ) is wider in the area of its bearing bore ( 24 d) than in the area of their contact surface ( 24 a). 2. Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass die Rolle (24) gestuft mit einem mittleren Bereich (24a) größeren Durchmessers und mit beiderseitigen Randbereichen (24b, 24c) kleineren Durchmessers ausge­ bildet ist.2. Valve train according to claim 1, characterized in that the roller ( 24 ) is stepped out with a central region ( 24 a) of larger diameter and with bilateral edge regions ( 24 b, 24 c) of smaller diameter. 3. Ventiltrieb nach Anspruch 2, dadurch gekennzeichnet, dass der mittlere Bereich (24a) etwa der Breite des Nockens (12, 14) und die Randbereiche (24b, 24c) zwischen 10% und 50%, insbesondere ca. 30%, dieser Breite entsprechen.3. Valve train according to claim 2, characterized in that the central region ( 24 a) approximately the width of the cam ( 12 , 14 ) and the edge regions ( 24 b, 24 c) between 10% and 50%, in particular approximately 30% , correspond to this width. 4. Ventiltrieb nach einem der Ansprüche 1 bis 3, wobei das Ventilbetäti­ gungselement (20) relativ zu zumindest zwei Nocken (12, 14) aktivierbar ist und die Nockenspitzen (12a, 14a) dieser Nocken (12, 14) verschieden große Hüllkreise (D1, D2) beschreiben, dadurch gekennzeichnet, dass die Durchmesserdifferenz der Bereiche (24a zu 24b, 24c) der Rolle (24) zu­ mindest der Durchmesserdifferenz der Hüllkreise (D1, D2) entspricht.4. Valve train according to one of claims 1 to 3, wherein the Ventilbetäti supply element ( 20 ) relative to at least two cams ( 12 , 14 ) can be activated and the cam tips ( 12 a, 14 a) of these cams ( 12 , 14 ) different sized enveloping circles (D1, D2) describe, characterized in that the diameter difference of the areas (24a to 24b, 24c) of the roller ( 24 ) corresponds at least to the diameter difference of the enveloping circles (D1, D2).
DE10121798A 2001-05-04 2001-05-04 Valve gear for internal combustion engine has valve operating element with rotatably mounted stepped roller with center section of larger diameter and edge sections on both sides with smaller diameter Withdrawn DE10121798A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10121798A DE10121798A1 (en) 2001-05-04 2001-05-04 Valve gear for internal combustion engine has valve operating element with rotatably mounted stepped roller with center section of larger diameter and edge sections on both sides with smaller diameter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10121798A DE10121798A1 (en) 2001-05-04 2001-05-04 Valve gear for internal combustion engine has valve operating element with rotatably mounted stepped roller with center section of larger diameter and edge sections on both sides with smaller diameter

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DE10121798A1 true DE10121798A1 (en) 2002-11-07

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2182181A1 (en) * 2008-10-10 2010-05-05 Gen Tek Technologies Marketing, Inc. Cam follower rocker arm
DE102010005606A1 (en) 2010-01-25 2011-07-28 Schaeffler Technologies GmbH & Co. KG, 91074 Cam follower for actuating a gas exchange valve
DE102010024196A1 (en) 2010-06-17 2011-12-22 Schaeffler Technologies Gmbh & Co. Kg Drag lever for a valve train of an internal combustion engine
DE102010034201A1 (en) 2010-08-12 2012-02-16 Audi Ag Roller cam for actuating gas exchange valve of internal combustion engine, has side walls provided in region of cam roller
DE102011087557A1 (en) 2011-12-01 2013-06-06 Schaeffler Technologies AG & Co. KG follower
DE102011109256B4 (en) * 2011-08-02 2015-11-19 Audi Ag Valve gear of an internal combustion engine and internal combustion engine
DE102015206525A1 (en) 2015-04-13 2016-10-13 Schaeffler Technologies AG & Co. KG Valve train for an internal combustion engine
DE102018207438A1 (en) * 2018-05-14 2019-11-14 Thyssenkrupp Ag Camshaft, and method for producing a camshaft
EP2944800B1 (en) * 2014-05-13 2022-08-24 Aktiebolaget SKF Method for manufacturing a roller, adapted to equip a mechanical system forming a cam follower.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314308A (en) * 1964-09-28 1967-04-18 Gen Motors Corp Accessory drive mechanism
US3998190A (en) * 1975-06-13 1976-12-21 Caterpillar Tractor Co. Roller follower with anti-rotation retainer
US4727832A (en) * 1986-06-13 1988-03-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Roller rocker arm
DE19519048A1 (en) * 1995-05-24 1996-11-28 Hermann Prof Dr Ing Krueger Lift valve drive for internal combustion engines
DE19520117A1 (en) * 1995-06-01 1996-12-05 Porsche Ag Valve drive of internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3314308A (en) * 1964-09-28 1967-04-18 Gen Motors Corp Accessory drive mechanism
US3998190A (en) * 1975-06-13 1976-12-21 Caterpillar Tractor Co. Roller follower with anti-rotation retainer
US4727832A (en) * 1986-06-13 1988-03-01 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Roller rocker arm
DE19519048A1 (en) * 1995-05-24 1996-11-28 Hermann Prof Dr Ing Krueger Lift valve drive for internal combustion engines
DE19520117A1 (en) * 1995-06-01 1996-12-05 Porsche Ag Valve drive of internal combustion engine

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2182181A1 (en) * 2008-10-10 2010-05-05 Gen Tek Technologies Marketing, Inc. Cam follower rocker arm
CN102725484A (en) * 2010-01-25 2012-10-10 谢夫勒科技股份两合公司 Cam follower for actuating a gas exchange valve
DE102010005606A1 (en) 2010-01-25 2011-07-28 Schaeffler Technologies GmbH & Co. KG, 91074 Cam follower for actuating a gas exchange valve
WO2011088924A1 (en) 2010-01-25 2011-07-28 Schaeffler Technologies Gmbh & Co. Kg Cam follower for actuating a gas exchange valve
CN102725484B (en) * 2010-01-25 2015-06-24 谢夫勒科技股份两合公司 Cam follower for actuating a gas exchange valve
US8656878B2 (en) 2010-01-25 2014-02-25 Schaeffler Technologies AG & Co. KG Cam follower for actuating a gas exchange valve
WO2011157499A1 (en) 2010-06-17 2011-12-22 Schaeffler Technologies Gmbh & Co. Kg Drag lever for a valve operating mecahnism of an internal combustion engine
CN102947552A (en) * 2010-06-17 2013-02-27 谢夫勒科技股份两合公司 Drag lever for a valve operating mecahnism of an internal combustion engine
CN102947552B (en) * 2010-06-17 2014-12-24 谢夫勒科技股份两合公司 Drag lever for a valve operating mecahnism of an internal combustion engine
DE102010024196A1 (en) 2010-06-17 2011-12-22 Schaeffler Technologies Gmbh & Co. Kg Drag lever for a valve train of an internal combustion engine
DE102010034201A1 (en) 2010-08-12 2012-02-16 Audi Ag Roller cam for actuating gas exchange valve of internal combustion engine, has side walls provided in region of cam roller
DE102011109256B4 (en) * 2011-08-02 2015-11-19 Audi Ag Valve gear of an internal combustion engine and internal combustion engine
US9255496B2 (en) 2011-08-02 2016-02-09 Audi Ag Valve train of an internal combustion engine, an internal combustion engine, and a method for producing a corresponding valve train
DE102011087557A1 (en) 2011-12-01 2013-06-06 Schaeffler Technologies AG & Co. KG follower
US8850925B2 (en) 2011-12-01 2014-10-07 Schaeffler Technologies Gmbh & Co. Kg Follower member
EP2944800B1 (en) * 2014-05-13 2022-08-24 Aktiebolaget SKF Method for manufacturing a roller, adapted to equip a mechanical system forming a cam follower.
DE102015206525A1 (en) 2015-04-13 2016-10-13 Schaeffler Technologies AG & Co. KG Valve train for an internal combustion engine
DE102018207438A1 (en) * 2018-05-14 2019-11-14 Thyssenkrupp Ag Camshaft, and method for producing a camshaft

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