EP2713018B1 - Arbre à cames pour un moteur à combustion interne - Google Patents

Arbre à cames pour un moteur à combustion interne Download PDF

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Publication number
EP2713018B1
EP2713018B1 EP13182637.2A EP13182637A EP2713018B1 EP 2713018 B1 EP2713018 B1 EP 2713018B1 EP 13182637 A EP13182637 A EP 13182637A EP 2713018 B1 EP2713018 B1 EP 2713018B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
bearing
region
drive wheel
diameter
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
EP13182637.2A
Other languages
German (de)
English (en)
Other versions
EP2713018A1 (fr
Inventor
Thomas Flender
Michael Kreisig
Falk Schneider
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.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
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 Mahle International GmbH filed Critical Mahle International GmbH
Publication of EP2713018A1 publication Critical patent/EP2713018A1/fr
Application granted granted Critical
Publication of EP2713018B1 publication Critical patent/EP2713018B1/fr
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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
    • F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
    • 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
    • F01L1/047—Camshafts
    • 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
    • F01L1/047—Camshafts
    • F01L2001/0471—Assembled camshafts
    • 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
    • F01L1/047—Camshafts
    • F01L2001/0476—Camshaft bearings

Definitions

  • the present invention relates to a hollow camshaft for an internal combustion engine having a longitudinally arranged drive wheel, in particular with a chain or pulley, and with at least a first and a second bearing, according to the preamble of claim 1.
  • Camshafts are well known and used in various designs in modern internal combustion engines. In order to achieve the smoothest possible storage of such a camshaft, they are usually stored on so-called rolling bearings, that is, for example, in the needle or ball bearings. Especially at the longitudinal end, on which the drive wheel is arranged, the bearing should not fall below a certain bearing diameter in order to be able to safely absorb the comparatively high bearing forces occurring there.
  • the minimum diameter for the camshaft was considered to be a diameter of 24 mm.
  • bearings for a hollow camshaft are known, but the inner diameter is smaller than the outer diameter of the camshaft.
  • the inner diameter is equal to the outer diameter of the camshaft.
  • the present invention addresses the problem of providing an improved embodiment for a camshaft of the generic type, which in particular allows the use of smaller camshaft diameters and thus lighter camshafts.
  • the invention is based on the general idea, a bearing of a camshaft, in particular in the region of a drive wheel, that is For example, in the range of a chain or a pulley, thereby improving that at least the first bearing used there is designed as a rolling bearing and has an inner diameter between 24 and 30 mm, which is greater than the outer diameter of the camshaft at one in the further course of the camshaft arranged second camp.
  • This makes it possible to store the camshaft on the one hand reliable and on the other hand form adjacent to the first bearing with a relatively small diameter and thereby compact and also easy to build.
  • the camshaft Due to the larger inner diameter of at least the first bearing, the forces occurring there can be easily absorbed by the bearing and it is also possible to make the other bearings for supporting the camshaft smaller.
  • the camshaft is widened on the longitudinal end side, in particular in the region of the drive wheel, and the first bearing is arranged on this widened region.
  • the expanded area is made by hydroforming or upsetting.
  • Both the hydroforming and upsetting represent process-reliable and at the same time cost-effective method for producing the areas widened according to the invention and can be applied individually.
  • a sleeve may be arranged on the camshaft in the region of the first bearing on which the first bearing is mounted.
  • Such a sleeve also forms an increase in the diameter, wherein such a sleeve may be formed, for example, in the simplest case in the manner of a ring.
  • a compound of the sleeve or the ring with the camshaft can be done for example by a press fit or a thermal joint seat.
  • a gluing or soldering of the sleeve with the camshaft is conceivable.
  • the first bearing can also be arranged directly on the drive wheel, wherein the drive wheel is fixedly connected to the camshaft, for example, in the manner of a plug is pressed into it.
  • the drive wheel has in addition to the actual drive pulley, for example, a gear, a radially enlarged compared to the camshaft bearing shoulder, on which the first bearing is arranged.
  • the camshaft in the present case with a constant small diameter, that is, with a diameter of less than 25 mm, for example, as a drawn tube, are made.
  • At least one of the bearings is designed as a ball bearing or as a needle bearing, whereby on the one hand a smooth bearing can be achieved and on the other hand, in the case of a needle bearing a comparatively compact design can be achieved. In the best case, it is even provided that rolling elements of the nail bearing run directly on an outer circumferential surface of the camshaft.
  • a diameter of 24 ⁇ d ⁇ 18 mm, preferably a diameter of d 22mm feasible, which represents a significant reduction compared to previous camshafts whose diameter was between 23 and 30 mm.
  • a camshaft 1 according to the invention comprises a first bearing 2 and a second bearing 3.
  • at least the first bearing 2 is now designed as a roller bearing and has an inner diameter d i between 24 and 30 mm, which is greater than the outer diameter d a of the camshaft 1 on the second bearing third
  • a drive wheel 4 is arranged, for example in the manner of a chain or belt wheel, said drive wheel 4 is pressed, for example in the manner of a plug with the camshaft 1.
  • the first bearing 2 is arranged on the drive wheel 4, specifically on a bearing shoulder 5 whose outer diameter substantially corresponds to the inner diameter d i of the first bearing 2 and is also larger than the outer diameter d a of the camshaft 1.
  • a sleeve 6 or a ring is arranged, on which the first bearing 2 is arranged. Also in this case, the inner diameter d i of the first bearing 2 is thus larger than the outer diameter d a of the camshaft 1, and precisely at that Thickness of the sleeve 6.
  • the first bearing 2 and the sleeve 6 are in turn arranged in the region of a drive wheel not shown this time or adjacent thereto.
  • the enlarged inner diameter d i of the first bearing 2 can thus be achieved by the radially larger bearing shoulder 5 on the drive wheel 4 or by a corresponding sleeve 6, wherein the sleeve 6 is pressed onto the camshaft 1 or thermally joined with this.
  • a bonding or soldering or welding of the sleeve 6 with the camshaft 1 is conceivable.
  • FIGS. 3 and 4 show a camshaft 1, in which this longitudinal end, in particular in the region of this time also not shown drive wheel 4, is widened, so that the first bearing 2 is arranged on the widened portion 7 of the camshaft 1.
  • the widened region 7 can be produced for example by hydroforming or upsetting. According to the FIG. 3 In this case, the widened region 7 results from a material compression on the camshaft 1, whereas the widened region 7 according to the FIG. 4 can be made by forming or hydroforming or upsetting.
  • the camshaft 1 according to the FIG. 5 also has a first bearing 2 in the region of the drive wheel 4, wherein here again the first bearing 2 is arranged on the radially enlarged bearing shoulder 5 of the drive wheel 4.
  • a second bearing 2 which is also designed as a roller bearing, in the case shown as a needle bearing.
  • a third bearing 8 which is also designed as a needle bearing and an inner diameter 24mm ⁇ d i ⁇ 30mm, wherein the inner diameter d i of the third bearing 8 is greater than the outer diameter d a of the camshaft 1 on the second bearing 3.
  • Das third bearings 8 is in turn arranged in a widened region 7 of the camshaft 1 and that in the present case on the side remote from the drive wheel 4 longitudinal end.
  • the provision of the third bearing 8 may be required in particular if, at the longitudinal end of the camshaft 1 facing away from the drive wheel 4, the forces occurring there, for example by arranging a further drive wheel for driving, for example, a pump, require this.
  • the first bearing 2 can in this case be designed as a fixed bearing, whereas the second bearing 3 and / or the third bearing 3.8 are designed as movable bearings.
  • Fixed bearing means in this case that a bearing of the camshaft 1 is made possible not only in the radial direction, but also in the axial direction.
  • FIG. 6 a camshaft 1 is shown which is substantially as shown in FIG. 4 corresponds, wherein two different types of second bearings 3 are provided.
  • the middle second bearing 3 has rolling elements 10, that is in the present case needles that run directly on an outer circumferential surface of the camshaft 1, whereas the right second bearing 3 additionally has an inner ring 9, on which the rolling elements 10, that is, roll the needles can.
  • the inner ring 9 can be pressed onto an outer circumferential surface of the camshaft 1 or joined by means of thermal joining seat.
  • the middle second bearing 3 builds more compact than the right second bearing. 3
  • the first bearing 2 is shown in all drawn embodiments as a ball bearing with balls as rolling elements and allows in this form both a radial and a thrust bearing. It is conceivable, of course, the training as a needle bearing in the manner of a fixed camp.
  • the assembly of the camshaft 1 according to the invention takes place with all camps 2, 3 and optionally 8 by inserting the camshaft 1 in a split cylinder head, where alternatively also an assembly of outer rings in a corresponding storage lane in the cylinder head with subsequent insertion of the stepped camshaft 1 in the storage lane is conceivable.
  • camshaft 1 With the camshaft 1 according to the invention, it is possible in an at least predominant region according to the Figures 1 and 2 form in the entire area with a significantly reduced outer diameter d a, for example, only 22 mm, whereby the camshaft 1 not only requires less space, but also is much lighter, which makes noticeable in particular when installed in an internal combustion engine of a motor vehicle by a fuel economy ,

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

Claims (6)

  1. Arbre à cames (1) creux destiné à un moteur à combustion interne comprenant une roue d'entraînement (4) disposée côté extrémité de la longueur, en particulier un pignon et ou une poulie, et comprenant au moins un premier palier (2) disposé dans la zone de la roue d'entraînement (4) et un deuxième palier (3) disposé dans le prolongement de l'arbre à cames (1), caractérisé en ce
    - qu'au moins le premier palier (2) est réalisé sous la forme d'un palier à roulement et présente un diamètre intérieur di compris entre 24 mm et 30 mm, le diamètre intérieur di étant plus grand que le diamètre extérieur da de l'arbre à cames (1) au niveau du deuxième palier (3),
    - en ce que le premier palier (2) est disposé au niveau d'une saillie de palier (5) de la roue d'entraînement (4), ou
    - en ce qu'une douille (6) est disposée, dans la zone du premier palier (2), au niveau de l'arbre à cames (1), sur laquelle est monté le premier palier (2), la douille (6) étant pressée sur l'arbre à cames (1) ou assemblée à ce dernier par voie thermique, ou
    - en ce que l'arbre à cames (1) est élargi côté extrémité de la longueur, en particulier dans la zone de la roue d'entraînement (4), et en ce que le premier palier est disposé au niveau de la zone élargie (7) de l'arbre à cames (1).
  2. Arbre à cames selon la revendication 1, dernière variante,
    caractérisé en ce
    que la zone élargie (7) est fabriquée par mise en forme sous l'action d'une pression élevée intérieure ou par refoulement ou par un épaississement de matériau.
  3. Arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que l'arbre à cames (1) présente un diamètre extérieur da compris entre 24 et 18 mm, de préférence un diamètre extérieur da égal à 22 mm.
  4. Arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    que des corps de roulement (10) au moins du deuxième palier (3) se déplacent directement sur une surface de l'enveloppe extérieure de l'arbre à cames (1).
  5. Arbre à cames selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'un troisième palier (8) est prévu, lequel est réalisé de la même manière sous la forme d'un palier à roulement et présente un diamètre intérieur di compris entre 24 mm et 30 mm, lequel est plus grand que le diamètre extérieur da de l'arbre à cames (1) au niveau du deuxième palier (3).
  6. Arbre à cames selon la revendication 5,
    caractérisé en ce
    que le troisième palier (8) est disposé au niveau d'une zone d'extrémité de la longueur (7) élargie de l'arbre à cames (1).
EP13182637.2A 2012-09-26 2013-09-02 Arbre à cames pour un moteur à combustion interne Active EP2713018B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012217456.7A DE102012217456A1 (de) 2012-09-26 2012-09-26 Nockenwelle für eine Brennkraftmaschine

Publications (2)

Publication Number Publication Date
EP2713018A1 EP2713018A1 (fr) 2014-04-02
EP2713018B1 true EP2713018B1 (fr) 2015-05-27

Family

ID=49123679

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13182637.2A Active EP2713018B1 (fr) 2012-09-26 2013-09-02 Arbre à cames pour un moteur à combustion interne

Country Status (4)

Country Link
US (1) US9574464B2 (fr)
EP (1) EP2713018B1 (fr)
JP (1) JP6198546B2 (fr)
DE (1) DE102012217456A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011110871B4 (de) * 2011-08-17 2018-12-06 Neumayer Tekfor Engineering Gmbh Gebaute Nockenwelle
DE102013223571A1 (de) 2013-11-19 2015-05-21 Mahle International Gmbh Ventil für eine Ventilvorrichtung
DE102014202199A1 (de) * 2014-02-06 2015-08-06 Mahle International Gmbh Pendelschieberzellenpumpe
DE102018210032A1 (de) * 2018-06-20 2019-12-24 Mahle International Gmbh Einstückiges Nockenwellenrohr
FR3089554B1 (fr) * 2018-12-06 2021-01-29 Renault Sas Procédé de montage d’un arbre à cames de moteur à combustion interne.
DE102020203923A1 (de) 2020-03-26 2021-09-30 Volkswagen Aktiengesellschaft Brennkraftmaschine mit mindestens einer reibungsarm gelagerten Nockenwelle

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US2010A (en) 1841-03-18 Machine foe
US2008A (en) 1841-03-18 Gas-lamp eok conducting gas pkom ah elevated buhner to one below it
JP2580820Y2 (ja) * 1992-07-08 1998-09-17 いすゞ自動車株式会社 カム軸の軸受け装置
DE19710487A1 (de) 1996-03-13 1997-09-18 Toshiba Kawasaki Kk Halbleitervorrichtung
DE19710847C2 (de) * 1997-03-15 1999-01-07 Selzer Fertigungstech Zusammengesetzte Steuerwelle und Verfahren für deren Herstellung
JP4048582B2 (ja) * 1997-09-30 2008-02-20 日産自動車株式会社 カムシャフト
JP3832695B2 (ja) * 1998-12-25 2006-10-11 株式会社チューブフォーミング 中空カムシャフトの製造方法および中空カムシャフト
JP4046077B2 (ja) * 2003-12-08 2008-02-13 トヨタ自動車株式会社 内燃機関の動弁装置
JP2006070731A (ja) * 2004-08-31 2006-03-16 Musashi Seimitsu Ind Co Ltd 中空カムシャフト及びその製造方法
JP2006226183A (ja) * 2005-02-17 2006-08-31 Jtekt Corp カムシャフト装置とその組立方法
DE102006036851A1 (de) * 2005-08-05 2007-06-28 Neumayer Tekfor Holding Gmbh Welle wie Nockenwelle für Brennkraftmaschinen, Verfahren zur Herstellung solcher Wellen, sowie damit ausgerüstete Brennkraftmaschinen
JP2008157062A (ja) * 2006-12-21 2008-07-10 Otics Corp カムシャフトの支持構造、カムシャフトの取付け方法及びカムシャフトの製造方法
ES2326555T3 (es) * 2007-02-09 2009-10-14 Thyssenkrupp Presta Teccenter Ag Procedimiento para el montaje de un conjunto constructivo premontado de arbol de levas.
JP5145953B2 (ja) * 2008-01-10 2013-02-20 株式会社ジェイテクト カムシャフト装置
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JP2010025013A (ja) * 2008-07-22 2010-02-04 Jtekt Corp カムシャフト装置
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JP5532872B2 (ja) * 2009-12-01 2014-06-25 株式会社ジェイテクト カムシャフト装置
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DE102010005874A1 (de) * 2010-01-27 2011-07-28 Daimler AG, 70327 Nockenwelle mit Wälzlager, Montageanordnung für eine Nockenwelle mit Wälzlager und Verfahren zur Fertigung
JP2011169224A (ja) * 2010-02-18 2011-09-01 Toyota Motor Corp 中空カムシャフトおよびその製造方法
DE102010024722A1 (de) * 2010-06-23 2011-12-29 Mahle International Gmbh Nockenwelle
JP5573420B2 (ja) * 2010-06-29 2014-08-20 トヨタ自動車株式会社 円錐ころ軸受装置

Also Published As

Publication number Publication date
JP2014066246A (ja) 2014-04-17
US9574464B2 (en) 2017-02-21
US20140083382A1 (en) 2014-03-27
EP2713018A1 (fr) 2014-04-02
DE102012217456A1 (de) 2014-03-27
JP6198546B2 (ja) 2017-09-20

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