WO2015155115A1 - Arbre à cames réglable - Google Patents

Arbre à cames réglable Download PDF

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Publication number
WO2015155115A1
WO2015155115A1 PCT/EP2015/057308 EP2015057308W WO2015155115A1 WO 2015155115 A1 WO2015155115 A1 WO 2015155115A1 EP 2015057308 W EP2015057308 W EP 2015057308W WO 2015155115 A1 WO2015155115 A1 WO 2015155115A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
outer shaft
cam
shaft
rolling elements
Prior art date
Application number
PCT/EP2015/057308
Other languages
German (de)
English (en)
Inventor
Michael Kunz
Bernd Mann
Uwe Dietel
Martin Lehmann
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
Priority to EP15713510.4A priority Critical patent/EP3129614B1/fr
Publication of WO2015155115A1 publication Critical patent/WO2015155115A1/fr

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
    • F01L1/02—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
    • F01L1/34—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
    • F01L1/344—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 changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
    • 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
    • F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod

Definitions

  • the present invention relates to an adjustable camshaft for the valve train of an internal combustion engine having an outer shaft and with an extending through the outer shaft inner shaft, wherein on the outer shaft at least one cam member and rotatably connected to the inner shaft, wherein the cam member rotatable to form a bearing is absorbed on the outside of the outer shaft.
  • DE 10 2005 014 680 A1 shows, by way of example, an adjustable camshaft for the valve train of an internal combustion engine with an outer shaft and an inner shaft extending through the outer shaft, wherein cam elements are arranged on the outer shaft and connected rotationally fixed to the inner shaft via a bolt. If the phase position of the inner shaft is changed relative to the phase position of the outer shaft, the cam elements on the outer shaft execute a rotational movement independently of a rotation of the camshaft, for example in a cylinder head or in a cylinder head cover. As a result, the adjustable cam elements are rotated against firmly arranged on the outer shaft further cam elements, so that the timing of, for example, intake valves and exhaust valves to each other can be changed.
  • the cam elements have cam tracks in contact with tapping elements. If the camshaft rotates about its longitudinal axis, a periodic application of force to the cam elements is effected by the tapping elements.
  • the dynamic application of force to the cam members results in a periodic cycling of the bearing formed by the rotatable engagement of the cam members on the outside of the outer shaft. Wear tests have shown that it is precisely this alternating load, although an improved oil exchange in the sliding gap between the cam member and the outer side of the outer shaft causes, as a kind of pumping effect sets, however, results in a periodic, minimal tilting movement of the cam elements on the outside of the outer shaft to increased wear.
  • cam elements are rotatably received on the outside of outer shafts via slide bearings. If the sliding bearings are designed with very low bearing air, the lubricant exchange in the bearing gap deteriorates. A poor supply of lubricant also leads to increased wear during prolonged use of the camshaft. If the bearing air is increased so that a slightly larger gap between the bore in the cam member and the outside of the outer shaft is formed, although the lubricant exchange is improved, but it can lead to edge bearing effects, which are also to be avoided.
  • the object of the invention is the development of an adjustable camshaft with an improved recording of the cam elements on the outside of the outer shaft.
  • the wear of the camshaft should be minimized.
  • rolling bearings allow a rotatable mounting of the cam member on the outer shaft, with which the above-mentioned disadvantages of the prior art can be overcome.
  • a rolling bearing assembly can be created, which allows a torque minimum rotation of the cam member on the outer shaft, since a rolling bearing has a lower loss friction compared to a plain bearing.
  • the wear of the bearing can be reduced, since with a sliding contact of a cam member on the outer shaft full lubrication due to the very small, and only short-term rotational movements can not be fully built.
  • a particular advantage is further characterized in that a roller bearing can be biased despite maintaining low torque, so that the periodic introduction of force by a tapping element on the cam element does not lead to a recurrent tilting of the cam member on the outer shaft.
  • no edge support effects so that a total of a roller bearing arranged between the cam member and the outer side of the outer shaft rolling elements allows a slightly biased recording of the cam member on the outer shaft, without larger torsional torques are required.
  • the cam member may have a receiving bore for receiving the rolling elements, wherein the rolling elements may abut against the inner surface of the receiving bore.
  • the rolling elements can roll directly in the bore in the cam element, so that the cam element at the same time assumes the function of a bearing outer ring.
  • the rolling elements bear against the outside of the outer shaft in direct contact, so that the outside of the Outer shaft forms a bearing inner ring on which the rolling elements can roll off.
  • the bearing may comprise a bearing outer ring, which is seated in the receiving bore of the cam member and against which the rolling elements.
  • the bearing may comprise a bearing outer ring, which is seated in the receiving bore of the cam member and against which the rolling elements.
  • the rolling elements can form, for example, needles or rollers, wherein balls can also be provided, which are arranged between the outer side of the outer shaft and the cam member.
  • balls can also be provided, which are arranged between the outer side of the outer shaft and the cam member.
  • two ball bearing sets can be provided, which are located in the outer areas of the receiving bore.
  • a circumferential bearing groove can be introduced in the outer side of the outer shaft, in which the rolling elements are at least a part of their diameter.
  • the bearing groove has a smaller diameter than the diameter of the outside of the outer shaft.
  • the cam member may be rotatably connected to the inner shaft with a bolt, and this may be passed through an opening in the outer shaft, wherein the bearing axially adjacent to the bolt or to the opening can be arranged.
  • the arrangement of the bolt does not interfere with the inclusion of rolling elements between the cam member and the outside of the outer shaft.
  • the cam member may have a cam collar have, which is laterally formed on a base body of the cam member.
  • the rolling elements may be limited in length to the width of the base body.
  • the rolling elements can be located in the receiving bore within or below the base body and laterally the cam collar connects, which serves to receive the bolt.
  • the bearing for receiving the cam element on the outer shaft may be provided a bearing cage in which the rolling elements, in particular self-holding, are added. It is also possible to attach locking washers to the cam element in order to fix the bearing cage with the rolling elements in the axial position.
  • FIG. 1 shows a cross-sectional view of an adjustable camshaft with a cam element, which according to the invention is received on rolling elements on the outside of an outer shaft,
  • FIG. 2 shows a cross-sectional view of an outer shaft for an adjustable camshaft for receiving rolling elements on the outside of the outer shaft
  • 3 shows a further embodiment of an adjustable camshaft with a bearing, which is formed by a rolling bearing with rolling elements
  • Figure 4 is a perspective view of an adjustable camshaft with a cam member which is received on the outer shaft via rolling elements, and
  • Figure 5 is a cross-sectional view of another adjustable
  • Camshaft with a cam element which is received according to the invention via rolling elements on the outside of an outer shaft,
  • Figure 1 shows a cross-section of an adjustable camshaft 1, which can serve for the valve train of an internal combustion engine.
  • the camshaft 1 has an outer shaft 10 and extending through the outer shaft 10 extending inner shaft 1 1, wherein the inner shaft 1 1 in the outer shaft 10 is rotatable.
  • the cam member 12 is rotatably received on the outer side 14 of the outer shaft 10 to form a bearing 13.
  • the bearing 13 has rolling bodies 15, which are located in the receiving bore in the cam member 12 and via which the cam member 12 is mounted on the outer side 14 of the outer shaft 10.
  • an upper rolling element 15 is cut and a lower rolling element 15 is shown uncut.
  • the rolling elements 15 are formed as needles and distributed over the circumference at the same distance a plurality of needles between the cam member 12 and the outer side 14 of the outer shaft 10 are arranged.
  • the cam element 12 has a base body 22 and a cam collar 21.
  • the base body 22 has on the outside a cam track 24, via which a tapping element taps a control movement for a valve of the internal combustion engine.
  • the side of the base body 22, the cam follower 21 connects, and the rolling elements 15 have a length which on the Width of the body 22 is limited. Thus, there are no rolling elements under the cam collar 21, and the bolt 19 can be arranged in the cam collar 21.
  • Figure 2 shows a cross-sectional view of the outer shaft 10 with introduced therein openings 20 for passing the bolt 19.
  • a bearing groove 18 is introduced, which has a width substantially the length of the rolling elements 15 corresponds.
  • a substantial advantage of the bearing groove 18 is the possibility that can be carried out without structural changes of the camshaft 1, the rolling elements 15 can be performed with a customized diameter, and for example, the bearing groove 18 is a radial Have depth that corresponds approximately to half the diameter of the rolling elements 15.
  • FIG 3 shows another embodiment of an adjustable camshaft 1 with an outer shaft 10 and an inner shaft 1 1 and on the outer side 14 of the outer shaft 10, a cam member 12 is received via a bearing 13.
  • the bearing 13 is designed as a complete bearing with a bearing outer ring 16 and a bearing inner ring 17, and between the bearing outer ring 16 and the bearing inner ring 17 are the rolling elements 15.
  • the rolling elements 15 roll against the bearing outer ring 16 and the bearing inner ring 17 from, and the Bearing outer ring 16 is inserted in the receiving bore in the cam member 12, and the bearing inner ring 17 is applied to the outer side 14 of the outer shaft 10.
  • the rolling bearing with the rolling elements 15, the bearing outer ring 16 and the bearing inner ring 17 is located below the base body 22, and thus laterally to the cam collar 21 with the pin 19th
  • FIG. 4 shows a perspective view of the adjustable camshaft 1 with the outer shaft 10 extending in the shaft axis 23 and on the outer shaft 10 the cam element 12 is received via the bearing 13.
  • the perspective view shows a plurality of rolling elements 15 for forming the bearing 13, which are located below the main body 22 of the cam member 12.
  • the side of the body 22 subsequent cam collar 21 serves to receive the bolt 19th
  • FIG. 5 shows a cross-sectional view of another embodiment of an adjustable camshaft 1 according to the invention, which can serve for the valve train of an internal combustion engine.
  • the camshaft 1 shown in FIG. 5 essentially corresponds to the camshaft 1 shown in FIG. 1 and consequently likewise has an outer shaft 10 and an inner shaft 11 extending through the outer shaft 10, the inner shaft 11 being rotatable in the outer shaft 10 is.
  • On the outside of the outer shaft 10, a cam member 12 is arranged, which is rotatably connected via a pin 19 with the inner shaft 1 1.
  • the cam member 12 is rotatably received on the outer side 14 of the outer shaft 10 to form a bearing 13.
  • the bearing 13 has rolling bodies 15, which are located in the receiving bore in the cam member 12 and via which the cam member 12 is mounted on the outer side 14 of the outer shaft 10.
  • an upper rolling element 15 is cut and a lower rolling element 15 is shown uncut.
  • the rolling elements 15 are formed as needles and there are distributed over the circumference at the same distance a plurality of needles between the Cam member 12 and the outer side 14 of the outer shaft 10 is arranged.
  • the camshaft 1 shown in FIG. 5 differs from the camshaft 1 shown in FIG. 1 essentially in that the outer shaft 10 has no bearing groove 18 for the axial guidance of the rolling elements 15, as shown in particular in FIG.
  • the rolling elements 15 bear against the outside of the outer shaft 10 in direct contact, so that the outer side of the outer shaft 10 advantageously forms a bearing inner ring on which the rolling elements can roll off.
  • a prior processing of the outer shaft 10 to create bearing grooves 18 is therefore advantageously not required.
  • the cam element 12 has a base body 22 and a cam collar 21.
  • the base body 22 has on the outside a cam track 24, via which a tapping element taps a control movement for a valve of the internal combustion engine.
  • the cam collar 21 connects, and the rolling elements 15 have a length which is limited to the width of the base body 22.
  • the bolt 19 can be arranged in the cam collar 21.

Landscapes

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

Abstract

La présente invention concerne un arbre à cames réglable (1), destiné au mécanisme de distribution d'un moteur à combustion interne, qui comporte un arbre extérieur (10) et un arbre intérieur (11) s'étendant à travers l'arbre extérieur (10), au moins un élément de came (12) étant disposé sur l'arbre extérieur (10) et étant relié solidairement en rotation à l'arbre intérieur (11), l'élément de came (12) étant logé à rotation du côté extérieur (14) de l'arbre extérieur (10) en formant un palier (13). Selon l'invention, le palier (13) comporte des éléments de roulement (15) entre l'élément de came (12) et le côté extérieur (14) de l'arbre extérieur (10).
PCT/EP2015/057308 2014-04-08 2015-04-02 Arbre à cames réglable WO2015155115A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15713510.4A EP3129614B1 (fr) 2014-04-08 2015-04-02 Arbre à cames réglable

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014104994.2 2014-04-08
DE102014104994.2A DE102014104994A1 (de) 2014-04-08 2014-04-08 verstellbare Nockenwelle

Publications (1)

Publication Number Publication Date
WO2015155115A1 true WO2015155115A1 (fr) 2015-10-15

Family

ID=52781110

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/057308 WO2015155115A1 (fr) 2014-04-08 2015-04-02 Arbre à cames réglable

Country Status (3)

Country Link
EP (1) EP3129614B1 (fr)
DE (1) DE102014104994A1 (fr)
WO (1) WO2015155115A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160084368A1 (en) * 2013-05-07 2016-03-24 Thyssenkrupp Presta Teccenter Ag Camshaft

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020207134A1 (de) 2020-06-08 2021-12-09 Mahle International Gmbh Verstellbare Nockenwelle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19526888A1 (de) * 1995-04-21 1997-01-23 Audi Ag Vorrichtung zum diskreten Verstellen der Phasenlage zumindest zweier Nockenwellen
DE102005014680A1 (de) * 2005-02-03 2006-08-10 Mahle International Gmbh Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeuge
JP2008208731A (ja) * 2007-02-23 2008-09-11 Honda Motor Co Ltd 可変バルブタイミング機構
DE102009055868A1 (de) * 2009-11-26 2011-06-01 Neumayer Tekfor Holding Gmbh Nockenwelle
DE102012103594A1 (de) * 2012-04-24 2013-10-24 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit durch Spritzöl beölbare, verstellbare Nocken
GB2504100A (en) * 2012-07-17 2014-01-22 Mechadyne Internat Ltd A concentric camshaft supported by roller bearings

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010020845A1 (de) * 2010-05-18 2011-11-24 Aktiebolaget Skf Lagergehäuse eines Nockenwellenlagers
DE102011081483A1 (de) * 2011-08-24 2013-02-28 Mahle International Gmbh Verfahren zur vereinfachten und lagegenauen Fixierung eines Nockenwellenmoduls an einem Zylinderkopf
DE102012103581A1 (de) * 2012-04-24 2013-10-24 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit durch Drucköl beölbare, verstellbare Nocken

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19526888A1 (de) * 1995-04-21 1997-01-23 Audi Ag Vorrichtung zum diskreten Verstellen der Phasenlage zumindest zweier Nockenwellen
DE102005014680A1 (de) * 2005-02-03 2006-08-10 Mahle International Gmbh Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeuge
JP2008208731A (ja) * 2007-02-23 2008-09-11 Honda Motor Co Ltd 可変バルブタイミング機構
DE102009055868A1 (de) * 2009-11-26 2011-06-01 Neumayer Tekfor Holding Gmbh Nockenwelle
DE102012103594A1 (de) * 2012-04-24 2013-10-24 Thyssenkrupp Presta Teccenter Ag Nockenwelle mit durch Spritzöl beölbare, verstellbare Nocken
GB2504100A (en) * 2012-07-17 2014-01-22 Mechadyne Internat Ltd A concentric camshaft supported by roller bearings

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160084368A1 (en) * 2013-05-07 2016-03-24 Thyssenkrupp Presta Teccenter Ag Camshaft
US9982766B2 (en) * 2013-05-07 2018-05-29 Thyssenkrupp Presta Teccenter Ag Camshaft

Also Published As

Publication number Publication date
DE102014104994A1 (de) 2015-10-08
EP3129614B1 (fr) 2018-03-28
EP3129614A1 (fr) 2017-02-15

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