EP4176164A1 - Gleitlager mit schmiermittelkanal und mit mindestens drei axialen schiebestellungen - Google Patents
Gleitlager mit schmiermittelkanal und mit mindestens drei axialen schiebestellungenInfo
- Publication number
- EP4176164A1 EP4176164A1 EP21743382.0A EP21743382A EP4176164A1 EP 4176164 A1 EP4176164 A1 EP 4176164A1 EP 21743382 A EP21743382 A EP 21743382A EP 4176164 A1 EP4176164 A1 EP 4176164A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bearing
- lubricant channel
- lubricant
- piece
- cam
- 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
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
- F01L2001/0476—Camshaft bearings
-
- 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
- F01L2013/0052—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 with cams provided on an axially slidable sleeve
-
- 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
- F01L2013/10—Auxiliary actuators for variable valve timing
- F01L2013/105—Hydraulic motors
-
- 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 invention relates to a slide bearing that can be used in particular in a valve train of an internal combustion engine
- a bearing piece of the slide bearing which can be designed in particular as a cam piece of the valve train, is rotatably and axially displaceably mounted within a bearing opening of a bearing housing.
- the axial displaceability is used, if necessary, to bring different cam elevations of the cam piece into operative connection with a gas exchange valve of the internal combustion engine, whereby the actuation of the gas exchange valve is changed during operation of the internal combustion engine.
- a lubricant channel is integrated into the bearing housing, via which lubricant can be fed to the contact gap formed between the bearing housing and the bearing piece.
- valve drive A corresponding valve drive is known from DE 102017203869 A1.
- the cam piece can be positioned in two axial sliding positions relative to the bearing housing that receives it.
- the lubricant channel formed in the bearing housing runs radially and, with respect to the axial extent (along the axis of rotation), is arranged centrally in the inner bearing surface of the bearing housing provided for contact with the cam piece.
- valve drive is also known from DE 102017205463 A1, with this valve drive lubricant channels which are integrated into the cam piece for a supply of lubricant to the contact gap of a plain bearing, which is formed by a cam piece and a bearing housing.
- a valve drive in which cam pieces of a camshaft that can be shifted in three stages are mounted in plain bearings and in which the radius of the outer bearing surfaces of the cam pieces is greater than the largest radius of three different cam lobes is known from DE 102017210661 A1.
- the invention was based on the object of specifying a slide bearing which is advantageously suitable for a rotatable and at least three-stage axially displaceable mounting of a cam piece in a bearing housing of a valve drive of an internal combustion engine.
- This object is achieved in a slide bearing according to claim 1.
- a valve train with such a plain bearing and an internal combustion engine with a corresponding valve train are the subject matter of claims 9 and 11.
- Advantageous embodiments of the slide bearing, valve train and internal combustion engine are the subjects of the further claims and / or result from the following description of the invention.
- a plain bearing which has at least one bearing housing and a bearing piece that is rotatably and axially displaceably mounted (each with respect to a relative axis of rotation) within a bearing opening of the bearing housing, the bearing piece forming an outer bearing surface that forms an inner bearing surface of the bearing housing with the formation of a Contact gap contacted.
- a first lubricant channel and a second lubricant channel are integrated, which are provided for a supply of lubricant to the contact gap, these lubricant channels axially spaced from each other open into the inner bearing surface of the bearing housing or in the outer bearing surface of the bearing piece and whereby by means of a Distribution device a supply of lubricant via the first lubricant channel and the second lubricant channel can be influenced.
- the axial displaceability of the bearing piece relative to the bearing housing is provided according to the invention in such a way that the outer bearing surface of the bearing piece or the inner bearing surface of the bearing housing in a first sliding position covers the mouth openings of the first lubricant channel and the second lubricant channel (at least largely, preferably completely).
- the distribution device preferably brings about a supply of lubricant to the contact gap both via the first lubricant channel and the second lubricant channel.
- the outer bearing surface of the bearing piece or the inner bearing surface of the bearing housing covers the mouth opening of the first lubricant channel (at least largely, preferably completely) and releases the mouth opening of the second lubricant duct (at least largely, preferably completely) (i.e. at least covers the mouth opening of the second lubricant channel mostly not).
- the distribution device preferably brings about a supply of lubricant to the contact gap exclusively via the first lubricant channel (i.e. not also via the second lubricant channel).
- the outer bearing surface of the bearing piece or the inner bearing surface of the bearing housing form the mouth of the first lubricant channel (at least for the most part, preferably completely) free and covers (at least for the most part, preferably completely) the mouth opening of the second lubricant channel.
- the distribution device preferably brings about a supply of lubricant to the contact gap exclusively via the second lubricant channel (ie not also via the first lubricant channel).
- Such a plain bearing enables an advantageous supply of lubricant to the contact gap in the at least three sliding positions, which also applies in particular when, as is preferably provided, the outer bearing surface of the bearing piece and the inner bearing surface in the second sliding position and / or in the third sliding position of the bearing ring only partially overlap.
- This makes it possible to design both the outer bearing surface of the bearing piece and the inner bearing surface of the bearing housing with a relatively small extension in the axial direction (with respect to the relative axis of rotation), whereby the space requirement for the integration of such a plain bearing in, for example, a valve drive according to the invention for an internal combustion engine is relatively small .
- Such a valve drive comprises at least one camshaft which is mounted in a sliding bearing according to the invention, the camshaft being designed as a cam piece or comprising at least one such cam piece and this cam piece being the bearing piece of the sliding bearing. Furthermore, the valve drive comprises at least three cam elevations arranged axially offset from one another, at least two, preferably all three, cam elevations differing. These cam elevations can alternatively be brought into operative connection by a corresponding axial displacement of the cam piece with a gas exchange valve of an internal combustion engine according to the invention, whereby these actuate the gas exchange valve with different valve lift profiles.
- the gas exchange valve is assigned to a combustion chamber of the internal combustion engine in order to control the introduction of fresh gas into this combustion chamber or the removal of exhaust gas from this combustion chamber.
- An internal combustion engine according to the invention also includes an adjusting device for moving the cam piece.
- the cam piece is designed in the form of a sleeve and is mounted on a base shaft of the camshaft in a rotationally fixed and axially displaceable manner. This avoids having to move the entire camshaft axially in order to bring the cam lobes alternately into operative connection with the gas exchange valve.
- the distribution device of a plain bearing according to the invention can preferably be designed in such a way that a preferably spherical valve body is arranged in each of the lubricant channels, which closes the respective lubricant channel and thereby prevents lubricant from being discharged from this lubricant channel if the associated mouth opening is not covered or released and consequently the mouth opening is arranged outside the contact gap.
- the valve body opens the respective lubricant channel and thereby enables lubricant to be supplied to the contact gap via this lubricant channel when the associated mouth opening is covered.
- valve body when it closes the associated lubricant channel, protrudes from the mouth opening of this lubricant channel.
- an automatic opening and closing of the lubricant channels as a result of an axial displacement of the bearing piece relative to the bearing housing can be achieved in that a valve body, which protrudes from the associated mouth opening if there is no overlap, is pressed into the associated lubricant channel when by a relative displacement the overlap of this mouth opening is realized between the bearing housing and the bearing piece.
- the first lubricant channel and the second lubricant channel are integrally formed in at least one section and thus, for example, only split into separate lubricant channels shortly before the orifice openings.
- the lubricant channels can be integrated into the bearing housing or the bearing piece in a relatively simple manner.
- the bearing piece as a cam piece has at least three axially offset cam elevations
- it can furthermore preferably be provided that the radius of the outer bearing surface of the bearing piece is larger than the largest radius of the cam lobes.
- the inner bearing surface of the bearing housing can then project beyond the outer bearing surface of the bearing piece or of the cam piece in the axial direction without a collision with a cam lobe which is preferably arranged axially adjacent to the outer bearing surface. Accordingly, it can also be provided that in the second and / or third sliding position at least one cam elevation is arranged at least partially within the bearing opening.
- FIG. 3 shows a section of the valve drive of the internal combustion engine in a first sliding position of the associated cam piece
- FIG. 1 an internal combustion engine is shown.
- a motor vehicle (not shown), for example, can be driven by means of the internal combustion engine.
- the internal combustion engine comprises the internal combustion engine 1 also shown in further detail in FIG. 2.
- the internal combustion engine 1 forms several (here: four) cylinder openings 4 in a combination of cylinder crankcase 2 and cylinder head housing 3.
- the cylinder openings 4 are connected on the inlet side to an intake pipe 5 of a fresh gas line 6 and on the outlet side to an exhaust manifold 7 of an exhaust line 8 of the internal combustion engine in a gas-carrying manner.
- fresh gas essentially air
- the fuel can be injected directly into the combustion chambers 9 by means of fuel injectors 11.
- the exhaust gas resulting from the combustion of the fuel-fresh gas mixture is discharged via the exhaust line 8.
- valve drive comprises a crankshaft 14 which forms crank pins 15, the crank pins 15 being connected to the pistons 10 via connecting rods 16.
- linear movements of the pistons 10 are converted into a rotation of the crankshaft 14, the rotation of the crankshaft 14 in turn causing a periodic change in direction of the linear movements of the pistons 10.
- crankshaft 14 The rotation of the crankshaft 14 is also transmitted via a control gear, for example a toothed belt gear 17, to two camshafts 18, each of which actuates two gas exchange valves 12, 13 per combustion chamber 9 via, for example, rocker arms or rocker arms (not shown).
- a control gear for example a toothed belt gear 17
- camshafts 18 each of which actuates two gas exchange valves 12, 13 per combustion chamber 9 via, for example, rocker arms or rocker arms (not shown).
- the internal combustion engine also includes an exhaust gas turbocharger.
- This has an exhaust gas turbine 19 integrated into the exhaust gas line 8 and a fresh gas compressor 20 integrated into the fresh gas line 6.
- An impeller of the exhaust gas turbine 19 that is driven to rotate by the exhaust gas flow drives an impeller of the compressor 20 via a shaft 21. The rotation of the impeller of the compressor 20 brought about in this way compresses the fresh gas passed through it.
- a charge pressure limitation can be achieved by means of a wastegate 22 in that part of the exhaust gas flow is guided past the exhaust gas turbine 19 when the internal combustion engine 1 is operating at high speed and / or load. Furthermore, an exhaust gas aftertreatment device 23 is integrated into the exhaust line 8.
- the internal combustion engine also comprises an adjusting device 24, by means of which one of a total of three cam lobes 25 can be assigned to the inlet valves 12 and / or the outlet valves 13, if necessary.
- This adjusting device 24 can be controlled by a control device 26 and is only indicated schematically in FIG. 2.
- the function of the adjustment device 24 is based on the longitudinal axial displaceability of sleeve-shaped cam pieces 27, which are arranged in a rotationally fixed manner on a base shaft 28 via interlocking longitudinal teeth, the cam pieces 64 being the three different ones for each of the inlet valves 28 or outlet valves 30 that can be actuated by them Have cam elevations 25, which are alternatively brought into operative connection with the associated gas exchange valves 12, 13 as a function of the respectively set axial sliding position of the cam pieces 27.
- the structure and the mode of operation of the adjusting device 24 can correspond to those disclosed in DE 102017203869 A1, DE 102017205463 A1 and DE 102017210661 A1.
- the cam pieces 27 are each rotatably mounted in at least one slide bearing, this mounting of the cam pieces 27 also ensuring axial mobility, which enables the various sliding positions of the cam pieces 27, in which the various cam lobes 25 with the respective associated gas exchange valve 12, 13 are brought into working connection to adjust.
- the slide bearings provided for mounting the cam pieces 27 include, according to FIGS.
- the outer diameter of the bearing section 31 of the cam piece 27 is only slightly smaller than the inner diameter of the bearing opening 30 in order to achieve a largely play-free but also jam-free relative mobility between the bearing housing 29 and the bearing section 31 of the cam piece 27.
- the wall of the bearing housing 29 delimiting the bearing opening 30 represents an inner bearing surface 32 of the bearing housing 29 and the outer surface of the bearing section 31 of the cam piece 27 represents an outer bearing surface 33 of the cam piece 27, with a contact gap 34 between the overlapping area of the inner bearing surface 32 and the outer bearing surface 33 is trained.
- two lubricant channels 35, 36 are integrated into the cylinder head housing 3 and thus into the bearing housing 29 and are connected to a common lubricant source (not shown).
- the lubricant channels 35, 36 of each slide bearing are initially formed integrally, ie as a common channel section, and then separate into partial strands that are axially spaced apart (with respect to the axis of rotation 37 of the camshaft 18 and thus also the cam pieces 27) in the inner bearing surface 32 of the respective Bearing housing 29 open.
- a preferably liquid lubricant can be introduced into the contact gap 34 of each slide bearing in order to achieve a relative movement with as little friction as possible between the components of the slide bearing, ie between the cam pieces 27 and the cylinder head housing 3 of the internal combustion engine 1.
- 3 to 5 show different sliding positions of a sliding bearing of the internal combustion engine 1, which is provided for mounting a cam piece 27, wherein in a first sliding position according to FIG. 3 the bearing section 31 of the cam piece 27 is axially centered within the bearing opening 30 of the bearing housing 29 is positioned.
- the outer bearing surface 33 of the cam piece 27 (completely) covers the mouth openings 38 of both lubricant channels 35, 36, so that the contact gap 34 is also arranged in the area of both mouth openings 38.
- lubricant is fed to the contact gap 34 via both lubricant channels 35, 36.
- a distribution device of the sliding bearing which is formed by a spherical valve body 39 arranged within each of the lubricant channels 35, 36 and an associated valve seat 40 arranged in the area of the respective mouth opening 38.
- the valve body 39 arranged in this lubricant channel 35, 36 is counteracted at least by the pressure of the lubricant, possibly also by the force of gravity acting on it the associated valve seat 40 is pressed, whereby the corresponding lubricant channel 35, 36 is closed.
- the valve body 39 pressed against the associated valve seat 40 it protrudes from the associated mouth opening 38 to such an extent that it is lifted off the valve seat by subsequent contact with the bearing section 31 of the cam piece 27 in order to open the corresponding lubricant channel 35, 36 .
- a centrally arranged cam lobe 25 of the cam piece 27 is in operative connection with the associated gas exchange valve 12, 13 of the internal combustion engine 1.
- FIG. 4 shows a second sliding position of a sliding bearing provided for mounting a cam piece 27, in which the outer bearing surface 33 of the cam piece 27 covers the mouth opening 38 of a first (35) of the lubricant channels 35, 36 and exposes the mouth opening of the second lubricant channel 36.
- Lubricant is consequently only supplied to the contact gap 34 via the first lubricant channel 35. This prevents that lubricant exits via the second lubricant channel 36, whereby otherwise the lubricant would escape uncontrolled into the valve drive and not into the contact gap 34, which is not arranged in the area of the mouth opening 38 of the second lubricant channel 36 in the second sliding position.
- a cam lobe 25, arranged on the right in FIGS. 3 to 5, of the cam piece 27 is in operative connection with the associated gas exchange valve 12, 13 of the internal combustion engine 1.
- FIGS. 3 and 5 shows a third sliding position of a sliding bearing provided for mounting a cam piece 27, in which the outer bearing surface 33 of the cam piece 27 covers the mouth opening 38 of the second lubricant channel 36 and exposes the mouth opening 38 of the first lubricant channel 35. Lubricant is then consequently only supplied to the contact gap 34 via the second lubricant channel 36.
- a cam lobe 25 arranged on the left in FIGS. 3 and 5 is in communication with the associated gas exchange valve 12, 13 of the internal combustion engine 1.
- the radius of the cylindrical outer bearing surface 33 of the cam piece 27 is larger than the largest radius of the cam lobes 25, which enables an advantageous assembly of the valve drive of the internal combustion engine 1, since the respective, preferably one-piece Cam piece 27 can be inserted into the associated bearing opening 30 in a simple manner.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020208231.6A DE102020208231A1 (de) | 2020-07-01 | 2020-07-01 | Gleitlager mit Schmiermittelkanal und mit mindestens drei axialen Schiebestellungen |
| PCT/EP2021/068121 WO2022003082A1 (de) | 2020-07-01 | 2021-07-01 | Gleitlager mit schmiermittelkanal und mit mindestens drei axialen schiebestellungen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP4176164A1 true EP4176164A1 (de) | 2023-05-10 |
| EP4176164B1 EP4176164B1 (de) | 2025-02-19 |
Family
ID=76999799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21743382.0A Active EP4176164B1 (de) | 2020-07-01 | 2021-07-01 | Gleitlager mit schmiermittelkanal und mit mindestens drei axialen schiebestellungen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4176164B1 (de) |
| DE (1) | DE102020208231A1 (de) |
| WO (1) | WO2022003082A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102021132652A1 (de) | 2021-12-10 | 2023-06-15 | Volkswagen Aktiengesellschaft | Nockenwellenanordnung |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006012386B3 (de) | 2006-03-15 | 2007-08-30 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Ventiltrieb für eine Brennkraftmaschine |
| 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 |
| DE102009049217A1 (de) * | 2009-10-13 | 2011-04-28 | Mahle International Gmbh | Brennkraftmaschine mit wenigstens einer Nockenwelle |
| DE102014015880B4 (de) * | 2014-10-27 | 2016-07-28 | Audi Ag | Ventiltrieb für Gaswechselventile einer Brennkraftmaschine mit verschiebbaren, in Lager eintauchenden Nockenträgern und axialer Abstützung der Nockenträger gegen die Lager |
| JP6688132B2 (ja) | 2016-03-31 | 2020-04-28 | 本田技研工業株式会社 | 可変動弁装置 |
| DE102017203869A1 (de) | 2017-03-09 | 2018-09-13 | Thyssenkrupp Ag | Nockenwelle mit geschmiertem Schiebestück |
| DE102017210661A1 (de) | 2017-06-23 | 2018-12-27 | Volkswagen Aktiengesellschaft | Ventiltriebvorrichtung für eine mehrzylindrige Brennkraftmaschine |
-
2020
- 2020-07-01 DE DE102020208231.6A patent/DE102020208231A1/de active Pending
-
2021
- 2021-07-01 WO PCT/EP2021/068121 patent/WO2022003082A1/de not_active Ceased
- 2021-07-01 EP EP21743382.0A patent/EP4176164B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| EP4176164B1 (de) | 2025-02-19 |
| DE102020208231A1 (de) | 2022-01-05 |
| WO2022003082A1 (de) | 2022-01-06 |
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