EP3180498A1 - Camshaft with sliding cam packet - Google Patents
Camshaft with sliding cam packetInfo
- Publication number
- EP3180498A1 EP3180498A1 EP15734411.0A EP15734411A EP3180498A1 EP 3180498 A1 EP3180498 A1 EP 3180498A1 EP 15734411 A EP15734411 A EP 15734411A EP 3180498 A1 EP3180498 A1 EP 3180498A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sliding cam
- camshaft
- needle bearing
- longitudinal groove
- 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 8
- 125000006850 spacer group Chemical group 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007423 decrease 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
- 238000009826 distribution Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 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
- 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
-
- 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
- F01L1/053—Camshafts overhead type
-
- 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
- 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
Definitions
- the present invention relates to a camshaft to the valve train of an internal combustion engine having a fundamental and at least one sliding cam package comprising a plurality of cam profiles, wherein the fundamental shaft extends through a passage in the sliding cam package, so that it is received axially displaceably on the fundamental shaft, and means for forming a torque transmitting connection between the fundamental and the sliding cam package are provided.
- Camshafts with sliding cam packs are used for variable valve train for an internal combustion engine and depending on an axial position of the sliding cam package on the fundamental shaft, a tap element for valve control with different, adjacent to each other formed on the sliding cam package cam profiles cooperate.
- the lifting information is stored in the specific cam profile and may include, for example, different sized valve strokes or a so-called zero stroke.
- this comprises, in addition to the cam profiles, an adjusting element in which an adjusting element engages, which is arranged in a stationary manner in the receiving body for receiving the camshaft.
- a receiving body which can be formed for example by a camshaft module in the manner of a hood, which can be applied with pre-assembled camshafts on the cylinder head of the internal combustion engine.
- Camshafts with a basic shaft and several sliding cam packages can also be mounted directly in the cylinder head itself.
- camshafts For mounting the camshaft in the receiving body, it is possible to store the sliding cam packages themselves in associated bearing blocks of the receiving body, ie to receive rotatable, then the fundamental wave through the Pass sliding cam packages, which then drives them only rotating.
- camshafts having a base shaft and a plurality of sliding cam packages applied to the fundamental shaft may also be preassembled, and the preassembled camshaft is then mounted in the receiving body.
- the camshaft is preferably mounted on the fundamental shaft, for example via corresponding bearing rings, which are applied to the fundamental shaft.
- the sliding cam packages are freely supported on the basic shaft, and via the means for torque-transmitting connection, the sliding cam packages rotate with the rotation of the fundamental shaft, while the sliding cam packages remain axially displaceable on the fundamental shaft.
- DE 10 2008 005 639 A1 shows a camshaft to the valve train of an internal combustion engine with a basic shaft and with sliding cam packages, which have a plurality of cam profiles.
- the basic shaft extends through a passage in the sliding cam package, wherein means for forming a torque-transmitting connection between the fundamental shaft and the sliding cam package are formed, which are based on a sliding cam teeth between the outside of the basic shaft and the passage of the sliding cam package.
- a problem with this is that due to manufacturing tolerances of the sliding toothing and concomitant inaccuracies in the radial guidance, inadmissibly high base circle deviations of the cam profiles of the sliding cam package can occur in arrangement on the fundamental shaft.
- DE 10 201 1 000 510 A1 shows a generic camshaft, and the means for forming a torque transmitting connection between the fundamental shaft and the sliding cam package comprise a plurality of balls forming a linear rolling bearing for axially displaceable receiving the sliding cam package on the fundamental shaft. Since the sliding cam package is always seated and operated in discrete positions on the basic shaft depending on the cam profiles, there may be the disadvantage that due to the high Hertzian pressure, the balls in the associated recesses can press into the surface of the recesses over a longer service life so that a rotational clearance of the sliding cam package can arise on the fundamental. Further, the balls form only a point contact with the recess in the passage of the sliding cam package or in the outer side of the fundamental shaft, whereby only small torques between the sliding cam package and the fundamental can be transmitted.
- the object of the invention is the improved design of means for forming a torque-transmitting connection between a fundamental and a sliding cam package of a camshaft, the means should be formed as low as possible and it should also be avoided over a prolonged period of use of the camshaft a game between the sliding cam package and the fundamental become. In particular, high surface pressures in contact of the means to the passage of the sliding cam package should be avoided.
- This object is achieved on the basis of a camshaft according to the preamble of claim 1 in conjunction with the characterizing features.
- the invention includes the technical teaching that the means comprise elongated needle bearing elements which are seated with a first part of their circular cross section in a longitudinal groove in the passage of the sliding cam package and which are seated with a second part of the same cross section in a longitudinal groove in the outside of the fundamental shaft.
- the formation of the means as a needle bearing elements leads to a wear-minimal and permanent formation of a torque transmitting connection between the fundamental shaft and the sliding cam package, and allows substantially half Einsitzen the needle bearing elements both in a longitudinal groove in the passage of the sliding cam member and in a longitudinal groove in the outside of the fundamental wave a force distribution in the contact area between the needle bearing elements and the longitudinal grooves, are avoided in the high force peaks. Due to the cylindrical shape of the needle bearing elements, a curvature-curvature contact is formed in a line shape, so that the stresses of the Hertzian pressure between the needle bearing elements and the longitudinal grooves are minimized.
- a camshaft can be provided to the valvetrain of an internal combustion engine that does not require the use of splines between the shift cam package and the fundamental shaft, and by the use of the needle bearing members, a high force transmission between the shift cam package and the fundamental shaft is enabled, without the contact force in the circumferential direction leads to increased wear.
- the longitudinal groove in the outer side of the fundamental wave can have a semicircular cross section which corresponds to the circular cross section of the needle bearing elements.
- the circular cross section may have the same radius as the cylindrical shape of the needle bearing elements, and If the needle bearing elements are located in this semicircular cross section, a play-free surface contact is formed in the surface of the longitudinal groove over the semicircular cross section of the needle bearing elements.
- the needle bearing elements can be displaced by the large contact surface wear minimum in the longitudinal groove in the outer side of the fundamental shaft when the sliding cam package is axially displaced on the fundamental shaft.
- the needle bearing elements can be accommodated axially fixed in the longitudinal grooves in the passage of the sliding cam package, so that they move along with the axial movement of the sliding cam package.
- the longitudinal groove in the passage of the sliding cam package may at the same time have a cross-sectional contour deviating from a circular arc.
- the deviation can take place in various ways, in particular, the deviation can be designed so that two contact areas for transmitting a contact force between the needle bearing elements and the sliding cam package are formed in the circumferential direction, as explained in more detail below in two variants.
- the cross-sectional contour of the longitudinal groove in the passage of the sliding cam package may be defined by two, in particular merging radii which are larger than the diameter of the needle bearing elements, so that two opposite contact areas are formed for contact of the needle bearing element.
- the radius of the longitudinal groove in the passage of the sliding cam element deviates from the radius of the needle bearing elements, which serves to form the circumferentially approximately opposite defined contact areas.
- the sliding cam package is preferably made of hardened bearing steel, the special geometry is formed there.
- the semicircular shape is preferred, which is adapted to the geometry of the needle bearing elements, in order to achieve as far as possible no differences in radii. As a result, the load in the fundamental wave is reduced and the shaft material can meet lower requirements.
- the cross-sectional contour of the longitudinal groove in the passage of the sliding cam package may have a trapezoidal shape, so that two opposite contact areas are also formed for the contact of the needle bearing element.
- Kalottenform so that the cross section of the longitudinal groove in the passage of the sliding cam package according to a Trapezoidal shape are executed, and the direction of the load attack can thus also be selectively changed.
- the shape can be reproduced more easily in terms of manufacturing technology than the dome shape and the influence of the manufacturing tolerances on the resulting load direction is lower.
- the trapezoidal shape has two obliquely arranged trapezoidal flanks, which are connected by a trapezoidal base.
- the longitudinal groove in the outer side of the fundamental shaft can be formed axially parallel to the extension of the fundamental shaft and / or one and preferably at least two needle bearing elements can be accommodated in a longitudinal groove.
- a plurality of longitudinal grooves can be provided on the circumference of the basic shaft, distributed equally or unequally, for example two, preferably three and particularly preferably four or more than four longitudinal grooves.
- a preferably corresponding number of longitudinal grooves can be provided in the passage of the sliding cam package.
- a spacer element may be present between two needle bearing elements accommodated in a longitudinal groove, wherein the spacer element may in particular be designed as a sheet metal element which at least partially surrounds the fundamental shaft, wherein the spacer element may also comprise a plastic material or another material.
- the sheet metal element may have a width corresponding to a substantial part of the length of the sliding cam package, and a wide spacer element causes, for example, two needle bearing elements are received in a longitudinal groove only in the outer regions of the sliding cam package.
- the fundamental wave can be formed from a tubular body.
- a hollow base shaft has a low weight, and since by the inventively designed means a spline can be omitted, and also no nuts in the fundamental wave must be taken, the wall of the hollow running basic wave can be made thin. This saves further weight of the camshaft.
- the outer diameter of the fundamental shaft with the diameter of the passage in the sliding cam package form a fit, so that a substantially play-free sliding fit of the sliding cam package is formed on the fundamental shaft.
- optimum guidance of a tapping element over the cam profiles of the sliding cam package is achieved by minimizing or avoiding radial bearing play of the sliding cam package on the fundamental shaft, which protects the valve train of the internal combustion engine.
- retaining rings may be provided which are arranged on at least one and preferably on both end sides of the sliding cam package, so that the needle bearing elements are secured axially in the longitudinal grooves by the retaining rings.
- the needle bearing elements are consequently fixed in the axial direction in the longitudinal groove on the inside by the spacer element and on the outside by the retaining rings.
- the retaining rings can be introduced into provided circumferential grooves in the end sides of the sliding cam package, for example non-positively, positively, force-positively or cohesively.
- the retaining rings can be soldered or welded to the side surfaces of the sliding cam package, in particular by electron beam welding, by laser welding or by friction welding.
- the retaining rings can also be arranged by a screw or adhesive connection on the side surfaces of the sliding cam package.
- the circlips have an inner diameter that is slightly larger than the outer diameter of the fundamental.
- the inventive design of the camshaft with further advantage results in a simple assembly of the sliding cam packages on the fundamental shaft.
- the spacer element in the form of a spring plate and the needle bearing elements in the passage of the sliding cam element can be joined, and with the needle roller elements used in the longitudinal grooves in the passage of the sliding cam package this can be pushed onto the basic shaft.
- the needle bearing elements also engage in the longitudinal grooves in the outside of the fundamental shaft.
- the retaining rings can be attached to the end sides of the sliding cam package.
- Figure 1 is a perspective view of a camshaft with a
- Figure 2 is a perspective, cutaway view of a
- Figure 3 is a cross-sectional view of a cylindrical
- Needle bearing element which is seated with a first part in a longitudinal groove in the passage of the sliding cam package and with a second part in a longitudinal groove in the outside of the fundamental shaft and
- Figure 4 is a cross-sectional view of a needle bearing element, wherein in
- the longitudinal groove in the passage of the sliding cam element has a trapezoidal shape.
- Figure 1 shows a perspective view of a camshaft 1 with a basic shaft 10 shown in sections, and on the basic shaft 10 is a sliding cam package 1 1 is exemplified, which is shown in a half-section and axially seated on the basic shaft 10.
- the sliding cam package 1 1 can be reciprocated on the basic shaft 10 in the axial direction, and the sliding cam package 1 1 has a plurality of mutually different cam profiles 12, which are set in dependence Axial position on the fundamental wave 10 different stroke information to pass a tapping element.
- means 14 For torque transmission between the fundamental shaft 10 and the sliding cam package 1 1 serve means 14, and the means 14 comprise according to the invention elongated needle bearing elements 15th
- longitudinal grooves 16 are introduced in the passage 13 of the sliding cam package 1 1, through which the fundamental shaft 10 extends through.
- the longitudinal grooves 16 are distributed over the circumference at equal distances from each other and extend with constant cross section in the axial direction in the inner wall of the passage 13.
- the longitudinal grooves 16 correspond with their number and with their position with longitudinal grooves 17 in the outer side of the fundamental 10 are introduced.
- the needle bearing elements 15 sit with a first part of their circular cross section in the longitudinal grooves 16 in the passage 13 of the sliding cam package 1 1 and with a second part of the same circular cross section sit in the longitudinal grooves 17 in the outside of the fundamental wave 10, wherein the parts of the circular cross section of Needle bearing elements 15 preferably each half in the longitudinal grooves 16, 17 are seated.
- a spacer element 18 designed as sheet metal elements.
- the spacer element 18 encloses the basic shaft 10 substantially completely and is seated in a correspondingly rotated centrally arranged recess in the passage 13 of the sliding cam package 11.
- the needle bearing elements 15, which each sit laterally to the spacer element 18 in the longitudinal grooves 16, 17, are held at a distance from each other.
- the needle bearing members 15 are prevented from axially slipping out of the longitudinal grooves 16, 17 by abutting on the side surfaces of the Sliding cam package 1 1 retaining rings 19 are attached, by which the needle bearing elements 15 are axially secured.
- the exemplary embodiment shows a hollow basic shaft 10, wherein the camshaft 1 can be mounted via the basic shaft 10 in a receiving body, for example in a hood module or in a cylinder head.
- Figure 3 shows a first embodiment for receiving a needle bearing element 15 in the longitudinal grooves 16 and 17, wherein the longitudinal groove 16 is inserted in the passage 13 of the sliding cam package 1 1 and the longitudinal groove 17 is introduced into the outside of the fundamental shaft 10.
- the illustration shows the needle bearing element 15, which is half seated in the longitudinal groove 17, wherein the longitudinal groove 17 has a contour with a radius which corresponds approximately to the radius of the cylindrical needle bearing element 15. Deviating from the radius of the needle bearing element 15, the longitudinal groove 16 has two radii and by the two radii two areas for initiating a contact force F are defined, and in the areas touched the needle bearing element 15, the surface in the longitudinal groove 16. Due to the slight deviation from the radius of the needle bearing element
- FIG. 4 shows, in a modification of the embodiment from FIG. 3, a longitudinal groove
- the longitudinal groove 17 in the outer side of the fundamental shaft 10 has a radius corresponding to the radius of the cylindrical needle bearing element 15.
- the trapezoidal longitudinal groove 16 has two obliquely arranged, opposite trapezoidal flanks 20, and as a groove bottom extends between the trapezoidal flanks 20 a trapezoidal base side 21st
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014111383.7A DE102014111383A1 (en) | 2014-08-11 | 2014-08-11 | Camshaft with sliding cam package |
PCT/EP2015/065558 WO2016023687A1 (en) | 2014-08-11 | 2015-07-08 | Camshaft with sliding cam packet |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3180498A1 true EP3180498A1 (en) | 2017-06-21 |
EP3180498B1 EP3180498B1 (en) | 2019-10-16 |
Family
ID=53514198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15734411.0A Active EP3180498B1 (en) | 2014-08-11 | 2015-07-08 | Camshaft with sliding cam packet |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3180498B1 (en) |
DE (1) | DE102014111383A1 (en) |
WO (1) | WO2016023687A1 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102018207438A1 (en) * | 2018-05-14 | 2019-11-14 | Thyssenkrupp Ag | Camshaft, and method for producing a camshaft |
CN108487962B (en) * | 2018-06-01 | 2024-03-22 | 浙江正奥汽配有限公司 | Valve control device of engine |
CN110848365B (en) * | 2018-08-21 | 2022-03-11 | 上海汽车集团股份有限公司 | Sliding cam mechanism |
DE102018133403A1 (en) * | 2018-12-21 | 2020-06-25 | Thyssenkrupp Ag | Camshaft, internal combustion engine and method for producing a camshaft |
DE102019105457A1 (en) | 2019-03-04 | 2020-09-10 | Thyssenkrupp Ag | Camshaft, motor vehicle and method of assembling a camshaft |
DE102019105462A1 (en) * | 2019-03-04 | 2020-09-10 | Thyssenkrupp Ag | Camshaft, motor vehicle and method of assembling a camshaft |
DE102019206044A1 (en) | 2019-04-26 | 2020-10-29 | Thyssenkrupp Ag | camshaft |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008208731A (en) * | 2007-02-23 | 2008-09-11 | Honda Motor Co Ltd | Variable valve timing mechanism |
DE102008005639B4 (en) | 2008-01-23 | 2021-10-21 | Daimler Ag | Valvetrain device |
DE102010004579A1 (en) * | 2010-01-14 | 2011-07-21 | Audi Ag, 85057 | Valve train for operation of valves of four cylinders of combustion engine, has camshaft with carriers having rotary driving units at front ends, respectively, where driving units of adjacent carriers are engaged in axially movable manner |
DE102011000510B4 (en) | 2011-02-04 | 2019-03-28 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Sliding cam system with linear bearing |
DE102011000511A1 (en) | 2011-02-04 | 2012-08-09 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Slide cam system has sliding block that is guided in longitudinal groove of drive shaft and received in longitudinal groove of cam assembly, where sliding block is arranged in width direction of cam assembly and latched with shaft |
DE102014007287A1 (en) * | 2014-05-20 | 2015-11-26 | Thyssenkrupp Presta Teccenter Ag | camshaft |
-
2014
- 2014-08-11 DE DE102014111383.7A patent/DE102014111383A1/en not_active Withdrawn
-
2015
- 2015-07-08 EP EP15734411.0A patent/EP3180498B1/en active Active
- 2015-07-08 WO PCT/EP2015/065558 patent/WO2016023687A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP3180498B1 (en) | 2019-10-16 |
WO2016023687A1 (en) | 2016-02-18 |
DE102014111383A1 (en) | 2016-02-11 |
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