EP3292280A1 - Ventiltriebvorrichtung - Google Patents
VentiltriebvorrichtungInfo
- Publication number
- EP3292280A1 EP3292280A1 EP16701058.6A EP16701058A EP3292280A1 EP 3292280 A1 EP3292280 A1 EP 3292280A1 EP 16701058 A EP16701058 A EP 16701058A EP 3292280 A1 EP3292280 A1 EP 3292280A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- drive device
- cam piece
- valve drive
- track
- 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
- 238000006073 displacement reaction Methods 0.000 claims description 11
- 230000005856 abnormality Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000009849 deactivation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method 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
- 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
-
- 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
-
- 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
- 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 invention relates to a valve drive device, in particular a motor vehicle, according to the preamble of claim 1.
- the valve drive device comprises a camshaft with a cam piece arranged axially displaceably on a cam basic shaft with at least two cams which provide camshafts which are phase-displaced during a rotation of the camshaft and are assigned to different cylinders and a shift gate for axially displacing the cam piece, the shift gate having a first cam track for axially displacing the cam piece in a forward direction and a second cam track for axially displacing the cam track in a reverse direction opposite to the forward direction.
- variable valve drive devices in internal combustion engines, which can realize both the shutdown of individual cylinders and a valve lift switching by axial displacement of cam pieces with cams of different cam contour (eg. Full cam, half cam and / or zero cam) (so-called.
- Variable valve train devices with axially displaceable cam pieces do not have a classic one-piece camshaft, but one
- Tooth shaft as a camshaft on which two or more cam pieces are slidably mounted.
- Cam pieces take place via the teeth of the toothed shaft.
- the displacement of the cam pieces in the axial direction is effected by means of a stationary actuator, which causes an engagement of an actuating element, such as an adjusting pin in a switching gate of the cam piece.
- an actuating element such as an adjusting pin in a switching gate of the cam piece.
- Upon rotation of the cam piece this is forcibly guided by means of the adjusting pin by a defined axial switching travel of a few millimeters, which corresponds to the distance between two adjacent cams of a cam portion of the cam piece moved.
- each cam piece two ejectable actuators are assigned to engage in each case a slide track of the shift gate, wherein the first slide track for adjusting the cam piece in an axial forward direction and the second cam track for adjusting the cam piece in an axial reverse direction is provided (activation and deactivation in ACT).
- each cylinder is associated with an axially displaceable cam piece ("single cam piece")
- single cam piece axially displaceable cam piece
- valve train devices with a single cam piece are Y-shaped extending link tracks with two side by side extending in the circumferential direction
- the valve drive device comprises a camshaft having a cam piece arranged axially displaceably on a cam basic shaft and having at least two cams which provide phase-shifted cam strokes during a rotation of the camshaft and which are assigned to different cylinders. That's it According to the invention possible, the valve lifts two or more cylinders with a
- Cam base shaft are held, there are several cam pieces.
- a valve lift can be done with a double cam piece only in the base circle of the cam.
- a double cam piece is available for switching a smaller common cam base circle than when switching the valve lifts of two cylinders by means of two individual cam pieces.
- the valve and thus also the cam strokes are regularly rotated by 90 ° cam rotation angle to each other with two cylinders, which are adjusted with a common cam piece and thus phase-shifted. These 90 ° cam rotation angles correspond to the reduction of the base circle used for
- Double cam piece due to the higher to be moved cam piece mass and the smaller base circle area are more heavily loaded than in a
- the first slide track and the second slide track are so axially spaced from each other that they no
- Gateways no track section both in a move of the
- Cam piece is traversed in the reverse direction of an adjusting pin of the actuator. Rather, the two slide tracks are completely independent of each other and axially spaced from each other, so that a slide track for moving the Cam piece in the forward direction and the second cam track for moving the cam piece in the reverse direction is used.
- the invention is based on the knowledge that when gate tracks with a common track section of these passing Verstellpin is potentially heavily stressed at the existing crossing, branching or merging points.
- the adjusting pin at the junction point can abut against an opposite wall section of the united slide track without its axial movement component being able to be braked adequately beforehand, which can lead to the acoustic abnormalities described above.
- Two independent and axially spaced gateways offer
- the adjusting pin passing Verstellpin can be performed closely over its entire path between two slide web walls, and thus the axial
- Movement component of the cam piece are also gently braked after moving through a corresponding web guide, whereby mechanical loads of the adjusting pins can be reduced.
- the cam piece of the valve drive device according to the invention is integrally formed such that the two cams associated with the various cylinders and the shift gate are not axially displaceable relative to each other, but axially fixedly arranged on the cam piece.
- it is a previously described "double cam piece” or in the case of multiple cams to a one-piece “multiple cam piece”, wherein the individual cams are associated with two or more cylinders and each provide phase-shifted cam strokes.
- the two slide tracks each have a substantially in the circumferential direction Einspur Siemens
- an axial course component having a displacement portion for axial displacement of the cam piece and a substantially extending in the circumferential direction Auswerf Scheme.
- the cam piece according to the invention has two axially spaced and separate
- Each slide track can rotate the camshaft axis by more than 360 °, the beginning of the Einspur Schemes and the end of the
- Auswerf Switzerlands can be arranged axially adjacent to each other due to a helical course of the slide track. It is important that the circumferential angle range of the shift range is limited to the available base circle.
- the slide tracks each have a braking area between the sliding area and the ejection area, which has such a curved course an axial component of movement of the cam piece is gradually braked when a braking area is traversed by the adjusting pin.
- the adjusting pin In the braking area, the adjusting pin can be guided laterally on both sides closely to a slide track wall whose axial course component gradually decreases in the direction of the ejection area.
- both slide tracks can thus gradually axially apart or converge with substantially identical axial curvature. Furthermore, both slide tracks can extend at substantially the same angle (preferably more than 360 °) in the circumferential direction.
- the single track area of each slide track extends over a circumferential angle of more than 10 °, preferably more than 30 °, in particular 90 ° or more axially next to the ejection region of the respective slide track.
- the slide tracks in unwound form have a substantially S-shaped course.
- the cam piece is the invention
- Valve train device adapted for adjusting two or more cylinders, wherein at least two cams are provided for providing phase-shifted cam strokes.
- the cam piece may have two or more cam portions, each of which cam portion has at least one (full) cam.
- a (partial) cam or a (zero) cam can be arranged on the cam piece so that it is possible to switch between different valve actuation modes by displacing the cam piece.
- the cam piece has at least four axially rigid
- cam portions each having at least one (full) cam and a partial or zero cam, each of which two cam sections associated with a cylinder and can be configured to provide phase-identical cam strokes.
- Valve actuation is a cam piece in which the two slide tracks are arranged between the two cam sections associated with a first cylinder and the two cam sections associated with a second cylinder.
- the two slide tracks are in a central area of the two slide tracks
- each slide track of the valve drive device is associated with an actuator with an adjusting pin for engagement in the respective slide track, wherein the diameter of the adjusting pins is smaller than 6 mm and preferably less than 5 mm. Due to an axial deceleration of the cam piece
- the adjustment pins can be made narrower due to the lower load than in conventional
- Valve train devices with adjustable double cam pieces in which the
- Diameter of the adjusting pins registrable be 7 or more millimeters.
- the camshaft can be switched due to the stable, one-piece double cam pieces at a higher speed of 1800 rev / min, 2000 rpm or more than camshafts with conventional, axially displaceable arranged Einzelelnocken Tradingen in which the limit speed for switching 1700 U / may be min or less.
- the invention relates to a cam piece of a valve drive device according to the invention.
- FIG. 2 shows a valve drive device according to the invention in a longitudinal sectional view
- Fig. 3 is a view from above of an engine block with an inventive
- Fig. 4 is an explanatory view of a cam piece of a
- valve drive device together with the two slide tracks in unwound form (groove development)
- FIG. 1 shows a perspective view of a cam piece 10 of FIG
- the cam piece is in the form of a double cam piece adapted to actuate valves of two adjacent cylinders, with the first cylinder associated cams 12 out of phase with the second cylinder associated cams 14 projecting from the cam piece 10.
- the phase shift is approximately 90 ° in the illustrated example.
- the individual cams 12, 14 are not movable relative to each other; Rather, the cam piece 10 is integrally formed.
- the illustrated cam piece 10 has a total of four cam sections 15, each of which comprises on the one hand a full cam and on the other hand either a zero cam or a partial cam.
- Cam sections each have a full cam 14 and a zero cam 16, so that can be switched between valve full and valve shutdown, and associated with the first cylinder two cam portions 15 each have a full cam 12 and a partial cam 17, so that are switched between valve full and valve subcircuit can.
- the valve drive device 10 is shown in a longitudinal sectional view.
- the cam piece 10 shown in FIG. 1 is arranged axially displaceably on a cam base shaft 52, wherein the cam base shaft 52 forms the camshaft 50 together with the cam pieces 10 displaceably arranged thereon.
- the cam piece 10 also has in a central region a shift gate 20 with two adjacent link tracks 22, 24, wherein the shift gate 20 is provided for axially displacing the cam piece 10 on the cam base shaft 50.
- an axially fixed adjusting pin 42 of an actuator 40 engages in the first slide track 22 of the rotating cam piece 10, whereby it is axially guided and displaced.
- a second axially fixed adjusting pin of a second actuator engages the second slide track 24 of the rotating cam piece 10, whereby it is axially guided and displaced in the opposite direction.
- the two slide tracks 22, 24 axially spaced from each other provided on the cam piece 10 and have no common track section. This allows the cam piece according to the invention despite its large compared to conventional Einzelelnocken Sharingen mass
- each of the two slide tracks 22, 24 has a running in the circumferential direction Einspur Scheme 32 with varying groove depth for the alignment of the adjusting 42, adjoining it in the circumferential direction adjustment 34 with axial flow component for moving or
- Reference numeral 62 shows the contact area between the wall of the slide track 22 and the Verstellpin 42 when moving the cam piece 10
- reference numeral 63 shows the contact area between the wall of the slide track 22 and the Verstellpin 42 during axial braking of the cam piece 10 following the displacement.
- the axially curved walls of the slide tracks gradually merge again into walls extending in the circumferential direction, so that a defined
- Abbremsung adjusting 42 can be used with a diameter of only about 4.9 mm and correspondingly narrow slide tracks 22, 24, whereby material can be saved and the cam pieces can be made relatively compact.
- the adjustment units can be made smaller, resulting in lower costs and a smaller space occupied.
- the adjustment portion 34 of the first slide track 22 curves opposite to the adjustment 34 of the second link 24, whereby on the one hand a displacement of the cam piece 10 in the forward direction V and on the other hand a displacement of the cam piece 10 in the reverse direction R is made possible.
- the slide tracks 22 and 24 are symmetrical with respect. A radially symmetrical plane arranged therebetween.
- FIG. 3 an engine block with two camshafts 50 is shown, each having two cam pieces 10.
- valve drive device 100 allows the use of
- Double cam pieces for switching speeds of 2000 rpm or more Double cam pieces for switching speeds of 2000 rpm or more.
- an increase in component durability over the term and significantly improved acoustics in the switching operation is achieved by the deceleration.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015208309 | 2015-05-05 | ||
PCT/EP2016/051155 WO2016177480A1 (de) | 2015-05-05 | 2016-01-20 | Ventiltriebvorrichtung |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3292280A1 true EP3292280A1 (de) | 2018-03-14 |
EP3292280B1 EP3292280B1 (de) | 2021-03-10 |
Family
ID=55177967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16701058.6A Active EP3292280B1 (de) | 2015-05-05 | 2016-01-20 | Ventiltriebvorrichtung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3292280B1 (de) |
DE (1) | DE112016002045A5 (de) |
WO (2) | WO2016177480A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102017210661A1 (de) | 2017-06-23 | 2018-12-27 | Volkswagen Aktiengesellschaft | Ventiltriebvorrichtung für eine mehrzylindrige Brennkraftmaschine |
DE102021210649A1 (de) | 2021-09-23 | 2023-03-23 | Thyssenkrupp Ag | Schaltkulisse, Schiebenockensystem und Nockenwelle |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102004024219B4 (de) * | 2004-05-15 | 2019-01-31 | Audi Ag | Ventiltrieb einer Brennkraftmaschine |
DE102011109764A1 (de) * | 2011-08-09 | 2013-02-14 | Daimler Ag | Nockenelement für eine Ventiltriebvorrichtung |
WO2013042227A1 (ja) * | 2011-09-21 | 2013-03-28 | トヨタ自動車株式会社 | 可変動弁装置 |
DE102011056833B4 (de) * | 2011-12-21 | 2023-03-23 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Ventiltriebvorrichtung für eine Brennkraftmaschine |
JP2013185470A (ja) * | 2012-03-06 | 2013-09-19 | Toyota Motor Corp | ロッカーアームクリップおよび動弁機構 |
DE102012105795A1 (de) * | 2012-06-29 | 2014-01-02 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Ventiltrieb einer Brennkraftmaschine |
JP5928835B2 (ja) * | 2013-07-03 | 2016-06-01 | 株式会社デンソー | バルブリフト調整装置 |
DE102014012808A1 (de) * | 2014-08-28 | 2015-03-19 | Daimler Ag | Ventiltriebvorrichtung für eine Brennkraftmaschine |
-
2016
- 2016-01-20 DE DE112016002045.7T patent/DE112016002045A5/de active Pending
- 2016-01-20 EP EP16701058.6A patent/EP3292280B1/de active Active
- 2016-01-20 WO PCT/EP2016/051155 patent/WO2016177480A1/de active Application Filing
- 2016-01-20 WO PCT/EP2016/051154 patent/WO2016177479A1/de active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2016177479A1 (de) | 2016-11-10 |
DE112016002045A5 (de) | 2018-03-15 |
WO2016177480A1 (de) | 2016-11-10 |
EP3292280B1 (de) | 2021-03-10 |
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