EP3014079A1 - Verstellbare nockenwelle - Google Patents
Verstellbare nockenwelleInfo
- Publication number
- EP3014079A1 EP3014079A1 EP14733087.2A EP14733087A EP3014079A1 EP 3014079 A1 EP3014079 A1 EP 3014079A1 EP 14733087 A EP14733087 A EP 14733087A EP 3014079 A1 EP3014079 A1 EP 3014079A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- outer shaft
- ölleitnut
- cam
- camshaft
- shaft
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 230000004323 axial length Effects 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 12
- 238000010894 electron beam technology Methods 0.000 claims description 4
- 238000005530 etching Methods 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 2
- 230000003716 rejuvenation Effects 0.000 claims 1
- 239000010687 lubricating oil Substances 0.000 description 46
- 239000003921 oil Substances 0.000 description 16
- 230000008901 benefit Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000012790 confirmation Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- F01L1/02—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
-
- 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
- F01L2810/00—Arrangements solving specific problems in relation with valve gears
- F01L2810/02—Lubrication
Definitions
- the present invention relates to a camshaft for the valve train of an internal combustion engine with an outer shaft and with a concentric in the outer shaft and rotatably received in this inner shaft, wherein on the outer surface of the outer shaft at least one cam member is rotatably supported to form a sliding bearing gap, and wherein the cam member is rotationally connected to the inner shaft.
- Adjustable camshafts for the valve train of an internal combustion engine with an outer shaft on which a cam element is received and which is rotationally connected to an inner shaft which extends through the outer shaft, serve for the variable control of the intake valves and exhaust valves of the internal combustion engine.
- On the outer shaft further cam elements are rotationally fixed, and the phase angle of the inner shaft is adjusted relative to the phase angle of the outer shaft, so also changed
- the nested waves rotate about a common axis of rotation in the cylinder head of the internal combustion engine and can be adjusted to each other via a control member in their phase position.
- the cam elements interact with the valves of the internal combustion engine directly or via rocker arms, and on the cam elements act on control forces that must be taken on the sliding bearing gap of the rotatable mounting of the cam elements on the outer shaft. It has been found that when there is a lack of lubricating oil supply of the sliding bearing gap between the inner surface of the cam elements and the outer surface of the outer shaft wear can be the result, which must always be avoided.
- the oil hole is located in the cam element, resulting in disadvantages in the processing.
- the introduction of a ⁇ lleitnut in the inner surface of the cam bore of the cam member is expensive, and it has been shown that due to the centrifugal forces during rotation of the camshaft, the lubricating oil remains predominantly in the ⁇ lleitnut, so that it is desirable, the transition of the lubricating oil from the ⁇ lleitnut in to improve the sliding bearing gap.
- the object of the invention is the improved supply of the sliding bearing gap between a cam member and an outer shaft of an adjustable camshaft with lubricating oil, in particular to avoid operating conditions with deficient lubrication of the sliding bearing gap substantially.
- the invention includes the technical teaching that in the outer surface of the outer shaft at least one ⁇ lleitnut is introduced in a position and with an axial length such that the ⁇ lleitnut is formed at least over the axial width of the sliding bearing gap and at least one side of the cam member from the Sliding bearing gap is led out with a free groove portion.
- the inventive introduction of at least one ⁇ lleitnut in the outer surface of the outer shaft creates the possibility of oil, referred to in the linguistic usage as lubricating oil, which can enter via the free groove portion in the ⁇ lleitnut to lead over this in the sliding bearing into it, and the lubricating oil passes in an improved manner in the sliding bearing gap between the outer surface of the outer shaft and the inner surface of the cam member.
- the sliding bearing gap is such that the cam member on the outer surface of the outer shaft can perform a movement in the lower micrometer range by the diameter of the outer shaft is slightly smaller than the diameter of the cam bore in the cam member. Due to the interaction of the cam element with a tap element for valve actuation results in a periodically changing application of force of the cam element, whereby a constant lifting and lowering the Inner surface of the cam hole is generated on the outer surface of the outer shaft. As a result, the micro gap prevailing in the sliding bearing gap is periodically increased and decreased, whereby a pumping action is generated.
- the ⁇ lleitnuten extend in the extension direction of the camshaft.
- the ⁇ lleitnut can run straight in the outer surface of the outer shaft, wherein for each setting point on which a cam member is disposed on the outer shaft, one or more ⁇ lleitnuten can be introduced in the direction of extension of the camshaft.
- the extension direction of the ⁇ lleitnuten runs parallel to the axis of rotation of the adjustable camshaft.
- the at least one ⁇ lleitnut with an axial extension component and with a circumferentially extending component in the outer surface of the outer shaft spiral. Due to the helical course of the ⁇ lleitnut the entry of lubricating oil over the free groove portion of the ⁇ lleitnut is favored, which protrudes from the sliding bearing gap between the outer shaft and the cam member, wherein the promotion of the Schmieröleintritts is generated in the ⁇ lleitnut by the rotation of the camshaft.
- a first ⁇ lleitnut is formed with a first spiral rotation direction and at least a second ⁇ lleitnut with one of the first Spiralrehraum oppositely formed second spiral rotation direction.
- the at least one ⁇ lleitnut be led out on both sides of the cam member from the sliding bearing gap with a respective free groove portion.
- the ⁇ lleitnut not only forms a lubricating oil reservoir formed in the sliding bearing gap, but the ⁇ lleitnut can be flowed through with lubricating oil by the lubricating oil on a first side of the cam member via a first free groove portion enters the ⁇ lleitnut and on the opposite side of the cam member via another free Nutabites the ⁇ lleitnut can leave again. Parts of the oil flowing through the ⁇ lleitnut lubricating oil can get in particular supported by the pumping action in the sliding bearing gap.
- a permanent replacement of the lubricating oil in the sliding bearing gap is achieved with particular advantage.
- a bolt may be provided which extends transversely through the inner shaft and through at least one bolt hole introduced in the outer shaft.
- the bolt can be seated with at least one of its ends in the cam member, whereby the rotationally fixed connection between the inner shaft and the cam member is generated.
- the at least one oil groove may be spaced from the arrangement of the bolt hole in the outer shaft.
- critical i. Highly loaded areas can be supplied by the ⁇ lleitnuten without crossing the at least one bolt hole in the outer shaft.
- the lubricating oil can not drain through the openings for the bolts.
- the cam elements may comprise at least one cam collar, wherein the axial width of the sliding bearing gap is determined by the width of the cam collar.
- the sliding bearing gap thus extends under the actual cam element and under the region of the cam collar, so that the oil guide grooves can also have a corresponding length over the actual cam element and the cam collar.
- the bolt for connecting the cam member to the inner shaft can thereby be seated in the cam collar, so that the cam member is rotationally connected via the cam collar and the bolt with the inner shaft.
- the ⁇ lleitnut have a variable over the length of cross-section, in particular such that the ⁇ lleitnut starting tapers from the free groove portion in the sliding bearing gap, for example. Due to larger dimensions in the region of the free groove portion of the entry of lubricating oil is favored in the groove portion, wherein by the inward in the Sliding bearing gap extending into the region of the ⁇ lleitnut the taper of the ⁇ lleitnut favors the escape of the lubricating oil from the ⁇ lleitnut in the sliding bearing gap.
- a surface structuring is provided, which may in particular be such that the Load capacity of a lubricant film forming between the outer surface of the outer shaft and the inner surface in the cam bore is improved.
- the surface structuring may be generated by a laser beam machining method, a honing method, an electron beam method or by etching methods in the outer surface of the outer shaft and / or in the inner surface in the cam hole.
- the surface structuring may include grooves or grooves in the surface, which are formed with respect to the longitudinal extent of the camshaft, for example, axially, circumferentially, spirally or mesh-like.
- the surface structuring providing micro-lubricating pockets into which the lubricating oil enters and provides a small amount of lubricating oil for passage into the journal bearing gap.
- An outline of the lubricating film to form a mixed friction is thereby effectively delayed.
- the inner surface in the cam bore comprise a Wienhonschliff, as this is also known from the cylinder bore of a reciprocating engine.
- the Wienhonschliff can be applied in the same way on the outer surface of the outer shaft, so that a net-like surface structuring arises.
- the surface of the camshaft may also be hardened so that the tips of the surface structure in contact with the cam elements are not worn. Furthermore, so the shrinkage of the cam elements on the Outer shaft in the entire setting area or by edge support effects avoided or reduced.
- Fig. 1 is a partial view of an outer shaft of an adjustable
- FIG. 2 is a fragmentary view of an adjustable camshaft with a cam member and with a ⁇ lleitnut in the region of
- Fig. 3 is a fragmentary view of an outer shaft with two in the
- Fig. 4 is a partially illustrated camshaft with a
- Cam element wherein two ⁇ lleitnuten shown in Figure 3 are introduced in the outer surface of the outer shaft in the region of the setting point of the cam element,
- Fig. 5 is a perspective section of an outer shaft with two
- FIG. 6 is a perspective view of a detail of the camshaft with an outer shaft, an inner shaft and a cam member, wherein in the outer surface of the outer shaft two ⁇ lleitnuten having a longitudinal extension direction, 7 shows a cross-sectional view of the outer surface of the outer shaft with a surface structuring,
- FIG. 8 is a perspective view of the outer surface of the outer shaft with a surface structuring
- 10 is a plan view of the outer surface of the outer shaft with a
- FIG. 10a shows the cross-sectional view of the outer surface of the outer shaft with the surface structuring according to FIG.
- FIGS. 1 and 2 show a first exemplary embodiment of an adjustable camshaft 1, FIG. 1 showing a section of an outer shaft 10, and FIG. 2 shows a section of a camshaft 1 with an outer shaft 10 according to FIG.
- the outer shaft 10 is formed as a hollow shaft, and an inner shaft 1 1 extends through the outer shaft 10 and is independent of the outer shaft 10 about a common camshaft axis 22 rotatable.
- the inner shaft 11 is rotatably mounted in the outer shaft 10.
- a cam member 23 is rigidly received, and the cam member 23 may for example be welded to the outer shaft 10 or fixed to a diameter expansion by means of a press fit.
- the cam member 23 rotates with the outer shaft 10 in phase.
- cam member 12 is rotatably received in the region of a setting point 16 on the outer surface 13 of the outer shaft 10 to form a sliding bearing gap.
- the cam member 12 has a cam collar 12a, and the cam member 12 is rotationally connected by means of a bolt 17 with the inner shaft 11.
- 10 bolt holes 18 are provided in the outer shaft, which extend over an angular range in the circumferential direction, so that the cam member 12 by a rotation of the inner shaft 11 relative to the phase position of the cam member 23 which is rigidly mounted on the outer shaft 10, can be twisted.
- valve control times of an internal combustion engine can be adjusted separately from one another, for example, control times for intake valves and exhaust valves.
- a ⁇ lleitnut 14 is shown, which has a spiral shape with an axial extension component in the direction of the camshaft axis 22 and an extension component in the circumferential direction.
- the width of the setting point 16 in the direction of the camshaft axis 22 is indicated by dashed lines, and the width of the setting point 16 corresponds to the width of the sliding bearing gap between the outer surface 13 of the outer shaft 10 and the cam member 12. It is shown that the ⁇ lleitnut 14 via the entire width of the setting point 16 extends away, and with free groove portions 15 extends beyond this, as shown in Figure 2.
- FIGS. 3 and 4 show a further exemplary embodiment of a camshaft 1.
- Figure 3 shows a portion of an outer shaft 10 with two ⁇ lleitnuten 14, wherein the outer shaft 10 is also shown with the ⁇ lleitnuten 14 in the partial view of the camshaft 1 of Figure 4.
- the introduced into the outer surface 13 of the outer shaft 10 ⁇ lleitnuten 14 have a mutually opposite spiral shape, and free groove portions 15 extend laterally beyond the side portion of the cam member 12 on the outer shaft 10.
- lubricating oil can enter both into the first oil guide groove 14 and into the second oil guide groove 14 via the free groove sections 15, wherein the entry into those free groove sections 15 takes place with respect to the spiral rotation direction in the direction of rotation of the camshaft 1 about the camshaft axis 22.
- a blade effect is utilized, and lubricating oil can pass through the ⁇ lleitnuten 14.
- the lubricating oil from the ⁇ lleitnut 14 reach into the sliding bearing gap over the width of the setting point 16 in order to supply the sliding bearing between the cam member 12 and outer shaft 10 with lubricating oil.
- Figures 5 and 6 show in a respective perspective view of another embodiment of ⁇ lleitnuten 14 in the outer surface 13 of the outer shaft 10, and the ⁇ lleitnuten 14 extend in the longitudinal direction of the camshaft 1 parallel to the camshaft axis 22.
- Figure 5 is shown that in the Outer shaft 10 introduced bolt opening 18 spaced from the arrangement of ⁇ lleitnuten 14 is arranged so that no lubricating oil can enter directly from the bolt hole 18 in the ⁇ lleitnut 14, as well as no lubricating oil can pass directly from the ⁇ lleitnut 14 in the bolt hole 18.
- the ends of the ⁇ lleitnuten 14 open into free groove portions 15 which run out laterally from the sliding bearing gap between the cam member 12 and the outer shaft 10 to cause lubricating oil can get over the free groove portions 15 in the ⁇ lleitnuten 14.
- the illustrations show a camshaft 1, as it can be received in the cylinder head of an internal combustion engine via plain bearings.
- the plain bearings can accommodate the camshaft 1 via the outer shaft 10, wherein the plain bearings can be supplied via oil passages in the stationary bearing shells with lubricating oil.
- the lubricating oil can emerge laterally at the sliding bearing points, and it can be provided within the meaning of the present invention with further advantage, the sliding bearings relative to the inner shaft 1 1 rotatably connected cam elements 12 adjacent to arrange, thereby causing the area of the outer surface 13th the outer shaft 10, to which the free groove portions 15 protrude, is afflicted with a larger amount of lubricating oil.
- Figures 7 and 8 show in a cross-sectional view ( Figure 7) and in a schematic perspective view ( Figure 8), the outer surface 13 of the outer shaft 10 with a surface structuring 19.
- the surface structuring 19, for example, by a laser beam processing method, a honing method, an electron beam method or by Etching process in the outer surface 13 of the outer shaft 10, but also in the inner surface of the cam bore, are introduced, in particular micro cavities 24 are generated.
- FIG. 9 shows further forms of a surface structuring 20 in the form of grooves, which are shown in cross-section of the outer shaft 10.
- the grooves 20 can be introduced, for example, by a machining process in the surface, for example by a honing process.
- FIG. 10 shows, by way of example, the outer surface 13 with surface structures 21 introduced into it, which are illustrated in the FIG. 10a according to the section line I to I.
- the surface structuring 21 has a semicircular cavity and extends oblong over portions of the outer surface 13. Also, such surface structures 21 can over laser beam processing methods, on Hon psychologist, over
- Electron beam method or by etching in the outer surface 13 are introduced and also serve to form micro-lubricating oil reservoirs to stockpile a lot of lubricating oil for lubrication of the sliding bearing gap.
- the surface structures 19 may intersect the oil guide grooves 14 in the outer surface 13 or be arranged adjacent thereto, so that lubricating oil can pass from the ⁇ lleitnuten 14 in the surface structures 21.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102013106746.8A DE102013106746A1 (de) | 2013-06-27 | 2013-06-27 | Verstellbare Nockenwelle |
PCT/EP2014/001709 WO2014206552A1 (de) | 2013-06-27 | 2014-06-24 | Verstellbare nockenwelle |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3014079A1 true EP3014079A1 (de) | 2016-05-04 |
EP3014079B1 EP3014079B1 (de) | 2017-03-29 |
Family
ID=51022281
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14733087.2A Not-in-force EP3014079B1 (de) | 2013-06-27 | 2014-06-24 | Verstellbare nockenwelle |
Country Status (9)
Country | Link |
---|---|
US (1) | US10132202B2 (de) |
EP (1) | EP3014079B1 (de) |
JP (1) | JP6328753B2 (de) |
KR (1) | KR20160026979A (de) |
CN (1) | CN105339607B (de) |
BR (1) | BR112015024442A2 (de) |
DE (1) | DE102013106746A1 (de) |
MX (1) | MX2015017802A (de) |
WO (1) | WO2014206552A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015113356A1 (de) | 2015-08-13 | 2017-02-16 | Thyssenkrupp Ag | Verstellbare Nockenwelle mit einem Phasenteller |
CN110848365B (zh) * | 2018-08-21 | 2022-03-11 | 上海汽车集团股份有限公司 | 一种滑移凸轮机构 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61126007U (de) * | 1985-01-29 | 1986-08-07 | ||
DE3932328A1 (de) * | 1989-09-28 | 1991-04-11 | Opel Adam Ag | Verfahren zur bearbeitung von durch reibung hochbeanspruchten flaechen in brennkraftmaschinen und vorrichtung zur durchfuehrung des verfahrens |
JPH1113426A (ja) * | 1997-06-23 | 1999-01-19 | Daido Metal Co Ltd | ローラ支持装置 |
DE102005040934A1 (de) * | 2005-02-03 | 2006-08-17 | Mahle International Gmbh | Verstellbare Nockenwelle, insbesondere für Verbrennungsmotoren von Kraftfahrzeugen, mit einer hydraulischen Stelleinrichtung |
DE102005014680A1 (de) * | 2005-02-03 | 2006-08-10 | Mahle International Gmbh | Nockenwelle mit gegeneinander verdrehbaren Nocken für insbesondere Kraftfahrzeuge |
GB2431977A (en) * | 2005-11-02 | 2007-05-09 | Mechadyne Plc | Camshaft assembly |
US7913657B2 (en) * | 2007-02-23 | 2011-03-29 | Honda Motor Co., Ltd. | Variable valve timing mechanism |
JP2008208755A (ja) * | 2007-02-26 | 2008-09-11 | Honda Motor Co Ltd | 可変バルブタイミング機構 |
US8028666B2 (en) * | 2008-03-12 | 2011-10-04 | GM Global Technology Operations LLC | Concentric camshaft with bearing sleeve and method of debris removal |
DE102008025781A1 (de) * | 2008-05-29 | 2009-12-10 | Thyssenkrupp Presta Teccenter Ag | Verstellbare Nockenwellenanordnung |
EP2530259B1 (de) * | 2010-01-25 | 2016-07-20 | Mitsubishi Jidosha Kogyo Kabushiki Kaisha | Variable ventilsteuerung für einen verbrennungsmotor |
CN102686911B (zh) * | 2010-12-28 | 2015-03-11 | 丰田自动车株式会社 | 双重凸轮轴结构及双重凸轮轴结构的组装方法 |
DE102012103594B4 (de) | 2012-04-24 | 2015-08-27 | Thyssenkrupp Presta Teccenter Ag | Nockenwelle mit durch Spritzöl beölbare, verstellbare Nocken |
-
2013
- 2013-06-27 DE DE102013106746.8A patent/DE102013106746A1/de not_active Ceased
-
2014
- 2014-06-24 WO PCT/EP2014/001709 patent/WO2014206552A1/de active Application Filing
- 2014-06-24 EP EP14733087.2A patent/EP3014079B1/de not_active Not-in-force
- 2014-06-24 MX MX2015017802A patent/MX2015017802A/es unknown
- 2014-06-24 US US14/901,158 patent/US10132202B2/en active Active
- 2014-06-24 KR KR1020167000602A patent/KR20160026979A/ko not_active Application Discontinuation
- 2014-06-24 CN CN201480036452.3A patent/CN105339607B/zh not_active Expired - Fee Related
- 2014-06-24 BR BR112015024442A patent/BR112015024442A2/pt not_active Application Discontinuation
- 2014-06-24 JP JP2016522315A patent/JP6328753B2/ja not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2014206552A1 * |
Also Published As
Publication number | Publication date |
---|---|
MX2015017802A (es) | 2016-04-19 |
DE102013106746A1 (de) | 2014-12-31 |
EP3014079B1 (de) | 2017-03-29 |
CN105339607A (zh) | 2016-02-17 |
JP6328753B2 (ja) | 2018-05-23 |
JP2016530427A (ja) | 2016-09-29 |
CN105339607B (zh) | 2018-12-07 |
WO2014206552A1 (de) | 2014-12-31 |
KR20160026979A (ko) | 2016-03-09 |
US10132202B2 (en) | 2018-11-20 |
US20160138434A1 (en) | 2016-05-19 |
BR112015024442A2 (pt) | 2017-07-18 |
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