EP2744987A1 - Nockenwelle für den ventiltrieb einer brennkraftmaschine - Google Patents
Nockenwelle für den ventiltrieb einer brennkraftmaschineInfo
- Publication number
- EP2744987A1 EP2744987A1 EP12743890.1A EP12743890A EP2744987A1 EP 2744987 A1 EP2744987 A1 EP 2744987A1 EP 12743890 A EP12743890 A EP 12743890A EP 2744987 A1 EP2744987 A1 EP 2744987A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- camshaft
- bearing ring
- carrier
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 239000000314 lubricant Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000003303 reheating Methods 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
- 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
Definitions
- the invention relates to a camshaft for the valve train of an internal combustion engine and an at least one such camshaft having internal combustion engine.
- a valve drive of an internal combustion engine which offers the possibility to adjust the stroke of the intake and exhaust valves of the internal combustion engine in stages.
- the adjusting device which is designed so that it simultaneously adjusts the two intake and exhaust valves of each cylinder of the internal combustion engine, comprises a cam carrier as part of the camshaft, the rotationally fixed but in axial
- Cam carrier has two cam groups each with two (in the axial direction)
- the adjusting device makes it possible to adjust the stroke of the valves assigned to these cam groups in that the cam carrier is displaced into one of a total of three defined axial positions, whereby a contact element of a finger lever, with which the valves are actuated, either with one of the two cams or with a In principle, a portion of the cam carrier, which has no cam lobe.
- the respective valve is defined with a defined by the respective cam lobe and in addition to the transmission ratio of the cam
- the stroke of the valve is zero, corresponding to the missing cam lift. Accordingly, a valve shutdown is realized via the "zero cam".
- An adjustment of the individual cam carrier in the axial direction of the camshaft is carried out by means of a respective guide wheel, which constitutes an integral part of the cam carrier.
- a running in the circumferential direction Y-shaped groove is intergrated.
- This groove thus has two divergent partial grooves in a section.
- the actual adjustment is achieved by means of a setting device which has a total of three extendable adjusting pins, one of which, depending on the respective position of the cam carrier on the basic shaft and of the desired adjustment direction, is extended and engages in a section of the groove. If one of the adjusting pins engages in one of the diverging sub-grooves, this leads as a result of the relative rotation of the crank gear to the pin to an axial displacement of the cam carrier on the fundamental shaft.
- a bearing ring is arranged in the valve drive of DE 10 2007 010 148 A1, which is rotatably arranged on the corresponding section of the cam carrier.
- the bearing ring is rotatably but slidably disposed in the axial direction within a housing of the internal combustion engine, the cylinder head cover arranged.
- the bearing ring serves to support the camshaft in the cylinder head cover, wherein the displaceability of the cam carrier is made possible in the direction of the longitudinal axis of the camshaft.
- the bearing ring forms on the outside a bar-shaped projection, which serves for a rotation of the bearing ring, whereby co-rotation is prevented with the camshaft.
- three recesses are integrated, in which a ball of a spring-loaded locking element engages to the cam carrier in the respective position in which this by means of
- the bearing ring in the valve train of DE 10 2007 010 148 A1 consists of two half shells, whereby a mountability on the limited by the cams of the two cam groups portion of the cam carrier is made possible.
- the invention has the object, an improved internal combustion engine with a generic, from the
- This object is achieved by a camshaft according to the independent claim 1 and by such a camshaft having internal combustion engine according to the independent claim 7.
- a generic camshaft for the valve train of an internal combustion engine the
- At least one rotatably and axially displaceably arranged on the fundamental shaft cam carrier which forms at least one cam group with at least two axially arranged side by side cams with different cam shapes
- a bearing ring which is not composed of two or more partial shells is understood to be "one-piece.”
- Such a bearing ring can preferably also be of one-part design, ie consist of only one component, but of course it is also possible to use a one-piece bearing ring according to the invention consisting of several components form, in which case at least the component that forms the inner surface is formed closed annular.
- a bearing ring which consists of two half-shells, as is the case with the valve train in DE 10 2007 010 148 A1, can not be safely avoided, since an offset during assembly of the two half-shells can not be excluded.
- the one-piece bearing ring of the camshaft according to the invention is thus characterized in each case by a low friction of its rotational movement on the cam carrier.
- An internal combustion engine according to the invention comprises at least one housing and at least one camshaft according to the invention arranged in the housing, wherein the fundamental shaft of the camshaft is rotatably supported within the housing via the at least one bearing ring of the cam carrier and the bearing ring is also displaceable relative to the housing in the axial direction of the camshaft ,
- each of the cam carrier of the camshaft according to the invention on a plurality and preferably two cam groups, which are arranged on both sides of the bearing ring.
- the cam carrier has a support tube, and at least one, preferably all of the cam groups (or the cam formed by these individually) as structurally separate from the support tube , but with this (permanently) connectable or connected
- cam carrier with a support tube and at least one
- cam groups not only has the advantage of mounting with a one-piece bearing ring according to the invention, but it is also possible to form the support ring and the cams (groups) of different materials to optimally adapt to the different stresses.
- the cam carrier of the camshaft according to the invention preferably has one
- Control ring with at least one introduced in the outside thereof, in at least one portion not in a radial plane of the camshaft extending control groove.
- control ring is formed as structurally separate from the support tube, but with the support tube (permanently) connected component.
- the camshaft according to the invention can be simplified, but in any case it is possible to optimally adapt the carrier tube or the control ring to the respective stresses by a targeted selection of the materials.
- Support tube is preferably provided a press fit, in which thus at the same
- the support tube is exposed to a lower temperature than the cam group (s) and / or the Verschiebering before assembly for the production of such a press fit;
- the support tube can be cooled and / or the
- Cam group (s) and / or the sliding ring are heated. After cooling or reheating of the components after assembly then sets the desired interference fit.
- the bearing of the bearing ring on the corresponding portion of the cam carrier is preferably formed as a hydrodynamic or hydrostatic sliding bearing.
- a lubricant is supplied to the bearing surfaces (i.e., the corresponding portion of the outer surface of the cam carrier and the inner surface of the bearing ring) via a bore in the bearing ring.
- Bearing ring bearing cam carrier This can be realized by the bearing ring having in its outer surface a "longitudinal groove" (not perpendicular to the longitudinal axis of the bearing ring) and a bore leading from the groove base to the inner side of the bearing ring Bearing ring a connection to a lubricant supply, which may be integrated, for example, in the housing of the internal combustion engine, be ensured.
- the width of the longitudinal groove may need to be (at least) the maximum
- Corresponding displacement of the cam carrier on the fundamental shaft may optionally be greater than the width of the bearing ring, which may be limited by the distance of the valves which are actuated by the cam groups of the cam carrier. This can complicate a constructive implementation of the lubricant supply, especially in small-volume internal combustion engines, since the integration of a sufficiently long longitudinal groove in the bearing ring does not seem feasible. To make this possible in a constructive simple manner, it is provided in a preferred embodiment of the camshaft according to the invention that the outer diameter of the bearing ring is greater than the maximum
- Cam lobe of the directly adjacent cams of the cam groups and the axial extent of the bearing ring - in at least a portion of its outer surface - is greater than the distance between the two cam groups. This will easily the (maximum) width of the bearing ring extended beyond the distance between the two cam groups.
- Camshaft co-rotating preferably fixed with respect to the housing standing
- Fuse element engages to form a rotation of the bearing ring.
- the bearing ring on the outside at least two spaced apart in the axial direction of the camshaft from each other
- Recesses forms, wherein a non-co-rotating with the camshaft, preferably fixedly arranged with respect to the housing position assurance element depending on the respective axial position of the cam carrier on the camshaft in one of
- Recesses engages and thereby a position assurance or locking of the
- Fig. 1 a cylinder head of an internal combustion engine according to the invention
- Fig. 2 the two camshafts of the internal combustion engine according to the invention according to the
- FIG. 3 shows a section of one of the camshafts of FIG. 2;
- FIG. 4 shows the components of a cam carrier of the camshafts according to FIG. 2;
- FIG. 5 shows a longitudinal section through the cam carrier according to FIG. 4;
- FIGS. 4 and 5 shows the cam carrier according to FIGS. 4 and 5 in an isometric view
- FIG. 7 shows a longitudinal section through a section of the cylinder head according to FIG. 1.
- the cylinder head shown in FIGS. 1 and 2 an inventive
- Internal combustion engine comprises a cylinder head cover 10 as part of a housing of the internal combustion engine.
- the cylinder head cover 10 forms two storage tunnels 12, in each of which a camshaft 14, 16 according to the invention is mounted.
- the two camshafts 14, 16 are driven by a crankshaft (not shown) of the internal combustion engine, to which a first of the camshafts 14 is connected to a drive wheel 18 which is connected via a toothed belt, not shown, with a corresponding output gear of the crankshaft.
- the first camshaft 14 drives the second camshaft 16 via a gearwheel drive, not shown.
- the second camshaft 16 with a
- Phase adjuster (not shown) may be provided, via which a phase shift of the mutually coupled rotational movements of the two camshafts 14, 16 can be achieved.
- Each of the two camshafts 14, 16 comprises a basic shaft 20, on which a total of four cam supports 22 are arranged secured against rotation.
- the anti-twist device is achieved via a spline on an inner surface of each of the cam carriers (see Fig. 6) in conjunction with a corresponding spline on the outer surface of the respective portion of the fundamental shaft 20.
- the longitudinal toothing ensures the inventively provided displaceability of the cam carrier 22 in the longitudinal direction of the camshaft 14, whereby a Hubumscnies of actuated by cam of the cam carrier 22 valves (not shown) of the internal combustion engine can be realized.
- Each of the cam supports 22 comprises a support tube 24 and two cam groups 26 structurally separate from the support tube and formed as annular units, each of the cam groups 26 being divided in the axial direction into three adjacent sections. In two of these sections, the cam groups each form a cam, which rises from the cylindrical basic shape of the outer surface at one point of the circumference. The two cams of each of the cam groups 26 have different shapes and in particular different maximum elevations, resulting in different valve lifts for the valves operated therewith.
- Cam groups 26 has no elevations and represents a zero cam. About the zero cam, the thus "actuated" valve can be kept closed.
- a three-stage Ventilhubscnies can be achieved.
- This Ventilhubscnies is achieved via an axial displacement of the total of four cam carrier 22 per camshaft 14, wherein in each case an actuating element (not shown), such as a drag lever, the each of the valves
- each of the cam carrier 26 via a control ring 28, in the otherwise cylindrical outer surface of a Y-shaped cam groove 30 is introduced.
- a first portion of this cam groove 30 runs exactly in the circumferential direction, i. jn a (radial) plane arranged perpendicular to the longitudinal axis of the control ring 28.
- a second section connects, in which the control groove 30 is formed of two diverging extending part-grooves.
- control ring 28 of each of the cam supports 26 is associated with an actuator 32 connected to the cylinder head cover 10 having three control pins (not shown) which may be extended (individually driven) to engage the first portion or one of the sub-grooves of the second portion Control groove 30 of the associated control ring 28 engage and move the cam carrier 22 in one direction on the fundamental shaft 20 due to the relative movement between the rotating control ring 28 and the fixed control pin.
- each of the cam carriers 22 comprises a bearing ring 34, which is rotatably arranged on the carrier tube 24 of the cam carrier 22 and between the two cam groups 26.
- the bearing ring 34 serves for one of the bearing of the camshaft 14 within the cylinder head cover 10. Since for an axial displacement of the cam carrier 22 on the fundamental shaft 20 of the camshaft 14, a corresponding displacement of the cam carrier 22 on the fundamental shaft 20 of the camshaft 14.
- Bearing ring 34 is required, provides the storage of the bearing ring 34 in the cylinder head cover 10 before a corresponding axial displacement.
- the bearing ring 34 on an outer bearing shell 36 which in a portion of the cylinder head cover 10 (in
- the outer bearing shell 36 has a cylindrical basic shape with a plurality of apertures, so that there is no completely closed cylindrical lateral surface. Furthermore, the bearing ring 34 still has a cylindrical inner bearing shell 38 which is connected to the outer
- Bearing shell 36 are connected via an annular web 40.
- the inner bearing shell 38 is supported on both sides on the two cam groups 26 of the cam carrier 22.
- the bearing ring 24 is in one piece according to the invention and also formed in one piece.
- Cam groups 26 is. Furthermore, the outer bearing shell 36 projects beyond the inner bearing shell 38 in the axial direction and thus partially engages over the adjacent cams. As a result, the bearing ring 34 can be realized with an outer bearing shell 36 which is wider than the distance between the two cam groups 26 of the cam carrier 22 (limited by the distance between the two valves controlled by the respective cam carrier 22). This allows to integrate a longitudinal groove 42 with a sufficient length in the outer bearing shell 36. This longitudinal groove 42 serves to establish a connection between a bore 44 extending from the groove base and extending through the web 40 to the inside of the inner bearing shell 38 and an outlet 46 of a lubricant supply integrated in the cylinder crankcase 10 (cf. 6).
- longitudinal groove 48 is integrated, into which engages a bolt of a screwed into the cylinder head 10 locking pin 50.
- Locking pin 50 a rotation for the bearing ring 34 of each of the cam carrier 22 is realized without hindering its axial displacement.
- the individual elements of the cam carrier (carrier tube 24, cam groups 26, bearing ring 34 and control ring 28) are connected by means of press fit. Their assembly is carried out as follows: The cam groups 26, the bearing ring 34 and the control ring 28 are pre-positioned and heated in the order provided. The carrier tube 24 is cooled simultaneously with liquid nitrogen. The cam groups 26, the bearing ring 34 and the control ring 2 are then inserted into a mounting device (not shown) and the support tube 34 is then pushed through these elements. Then, the cam groups 26 and the bearing ring 34 and the control ring 28 in the intended positions (relative to each other) are rotated. After an approximation of the temperatures of the elements, the desired interference fit is formed.
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 |
|---|---|---|---|
| DE201110111580 DE102011111580A1 (de) | 2011-08-20 | 2011-08-20 | Nockenwelle für den Ventiltrieb einer Brennkraftmaschine |
| PCT/EP2012/003233 WO2013026520A1 (de) | 2011-08-20 | 2012-07-30 | Nockenwelle für den ventiltrieb einer brennkraftmaschine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2744987A1 true EP2744987A1 (de) | 2014-06-25 |
| EP2744987B1 EP2744987B1 (de) | 2015-09-16 |
Family
ID=46639418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP12743890.1A Not-in-force EP2744987B1 (de) | 2011-08-20 | 2012-07-30 | Nockenwelle für den ventiltrieb einer brennkraftmaschine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2744987B1 (de) |
| DE (1) | DE102011111580A1 (de) |
| WO (1) | WO2013026520A1 (de) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102014109751B4 (de) * | 2014-07-11 | 2016-06-30 | Thyssenkrupp Presta Teccenter Ag | Verfahren zur Anordnung einer Nockenwelle in einem Nockenwellenmodul |
| DE102015101295A1 (de) | 2015-01-29 | 2016-08-04 | Thyssenkrupp Ag | Verfahren zur Montage einer Nockenwelle in einem Modulkörper |
| DE102015106308A1 (de) | 2015-04-24 | 2016-10-27 | Thyssenkrupp Ag | Nockenwellenmodul |
| CN118855566A (zh) * | 2023-04-28 | 2024-10-29 | 康明斯公司 | 用于支撑凸轮轴的凸轮轴托架、发动机系统和组装方法 |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10148243A1 (de) * | 2001-09-28 | 2003-04-10 | Ina Schaeffler Kg | Ventiltrieb mit Ventilhubumschaltung für die Gaswechselventile eines 4-Takt-Verbrennungsmotors |
| DE10241920A1 (de) * | 2002-09-10 | 2004-03-18 | Bayerische Motoren Werke Ag | Ventiltrieb für eine Brennkraftmaschine |
| DE102004008670B4 (de) * | 2004-02-21 | 2013-04-11 | Schaeffler Technologies AG & Co. KG | Ventiltrieb mit Nockenumschaltung für die Gaswechselventile eines 4-Takt-Verbrennungsmotors |
| DE102007022145A1 (de) * | 2006-07-26 | 2008-01-31 | Schaeffler Kg | Umschaltbarer Ventiltrieb einer Brennkraftmaschine |
| DE102007010149A1 (de) * | 2007-03-02 | 2008-09-04 | Audi Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit verschiebbarem Nockenträger und Doppelschneckentrieb |
| DE102007010148A1 (de) | 2007-03-02 | 2008-09-04 | Audi Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit einem axial beweglichen Lager |
| DE102007027979B4 (de) * | 2007-06-19 | 2015-07-23 | Audi Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit Nockenwellen-Tunnellager |
| DE102009030373A1 (de) * | 2009-06-25 | 2010-12-30 | Schaeffler Technologies Gmbh & Co. Kg | Ventiltrieb einer Brennkraftmaschine |
| DE102010004591B4 (de) * | 2010-01-14 | 2021-08-19 | Audi Ag | Gebauter Nockenträger für Ventiltrieb |
-
2011
- 2011-08-20 DE DE201110111580 patent/DE102011111580A1/de not_active Withdrawn
-
2012
- 2012-07-30 EP EP12743890.1A patent/EP2744987B1/de not_active Not-in-force
- 2012-07-30 WO PCT/EP2012/003233 patent/WO2013026520A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2013026520A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2744987B1 (de) | 2015-09-16 |
| WO2013026520A1 (de) | 2013-02-28 |
| DE102011111580A1 (de) | 2013-02-21 |
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