EP3014080A1 - Spring arrangement for a variable valve drive of an internal combustion engine - Google Patents
Spring arrangement for a variable valve drive of an internal combustion engineInfo
- Publication number
- EP3014080A1 EP3014080A1 EP14715302.7A EP14715302A EP3014080A1 EP 3014080 A1 EP3014080 A1 EP 3014080A1 EP 14715302 A EP14715302 A EP 14715302A EP 3014080 A1 EP3014080 A1 EP 3014080A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- intermediate lever
- camshaft
- roller
- spring element
- spring
- 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 11
- 238000009434 installation Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/34—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift
- F01L1/344—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for changing the timing of the valves without changing the duration of opening and without affecting the magnitude of the valve lift changing the angular relationship between crankshaft and camshaft, e.g. using helicoidal gear
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/14—Tappets; Push rods
-
- 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
- F01L13/0021—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 by modification of rocker arm ratio
-
- 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
- F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
-
- 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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
- F01L1/185—Overhead end-pivot rocking arms
-
- 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
- F01L13/0063—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot
- F01L2013/0068—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 by modification of cam contact point by displacing an intermediate lever or wedge-shaped intermediate element, e.g. Tourtelot with an oscillating cam acting on the valve of the "BMW-Valvetronic" 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
- F01L2305/00—Valve arrangements comprising rollers
Definitions
- spring elements are used, which are usually designed as double torsion springs with two oppositely wound helices and their two spring legs each biased against one of the cam follower, while the intermediate leg is clamped, for example, on the component forming the link.
- DE 10 2007 047 582 A1 describes a device for controlling the residual gas content of cylinders of an internal combustion engine, in which a double leg spring is fastened above the slide tracks via its intermediate leg and whose helices are likewise arranged above the component carrying the slide.
- the spring legs act on the axis of the camshaft rollers and load them against the camshaft and the scenery.
- a secondary spring is attached to the link component, the end leg biased biased in height of the axis of the control shaft roller against the intermediate lever and so press the roller against the control shaft.
- the abutment surface is arranged on the side opposite the working cam contour side of an axis of rotation of the camshaft roller on the intermediate lever, so that the spring element generates a torque about the axis of rotation of the camshaft pulley of the intermediate lever.
- the intermediate lever also enters a fixed contact with the control shaft, but without this would be acted upon by a large contact force. Accordingly, a sufficient contact force is produced by means of a single spring element for all contact points of the intermediate lever.
- the spring element is a double leg spring, whose intermediate leg is attached to the bearing housing of the variable valve drive and whose end legs bear against each biased a projection forming the projection of two juxtaposed intermediate lever members of the intermediate lever.
- the helix of the spring element is arranged on the side facing away from the camshaft and the roller sliding lever side of the intermediate lever.
- the spring element is easy to install and, if necessary, to change due to the good accessibility.
- the helix of the spring element is on the side facing the roller sliding lever Camshaft arranged, whereby the required space is reduced.
- the helix is arranged in the region of an axial extension of a rotation axis of a roller of the roller cam follower.
- the desired forces and torques can be introduced in a suitable manner and on the other hand, the spring element can be integrated in a compact manner in the variable valve train.
- the two juxtaposed Rollenschlepphebel which are associated with a double leg spring between the two helices of the double leg spring are arranged so that a good accessibility of the spring element is maintained.
- the two helices of the double leg spring between the two juxtaposed Rollenschlepphebeln which are associated with a double leg spring arranged, whereby the spring leg lengths can be formed shortened.
- a spring arrangement for a variable valve train of an internal combustion engine with which the required contact forces are produced by means of only one spring element in all three desired contact points and, in addition, no excessive forces are exerted on bearings or rollers.
- the intermediate lever is reliably positioned, its bearing clearances compensated and created a tolerance compensation. There is a low installation effort and construction requires space.
- Two embodiments of inventive spring arrangements for a variable valve train of an internal combustion engine are in the
- Figures are shown and described below.
- Figure 1 shows a detail of a first embodiment of a spring arrangement according to the invention for a variable valve train in a perspective view, wherein the motor housing parts are not shown for better understanding.
- Figure 2 shows a detail of a second embodiment of a spring arrangement according to the invention for a variable valve train in a perspective view, wherein the motor housing parts are not shown for clarity.
- the variable valve train shown in the figures consists of a camshaft 10 which is operatively connected via an intermediate lever 12 to a roller cam follower 14, which in turn has a connection to a valve rod 16 of a gas exchange valve 18 serving as an inlet valve.
- it is an internal combustion engine with two intake valves per cylinder, each associated with a roller cam followers 14.
- the intermediate lever 12 In order to transmit the actuating force of the camshaft 10 to the gas exchange valve 18, the intermediate lever 12 must be positioned and guided. For a completely defined, guided tilting movement for actuating a gas exchange valve 18, the intermediate lever 12 must have three contact points. In the present exemplary embodiment, there are a total of five contact points, since two gas exchange valves 18 are to be actuated via the one intermediate lever 12, which has two intermediate lever members 20 for this purpose, which have a common axis of rotation 22 are connected to each other, on the inside of the two intermediate lever members 20 each have a camshaft roller 24 is arranged and on the between the two intermediate lever members 20 a link roller 26 which bears against a gate 28 which is fixed to the bearing housing, not shown.
- the other two contact points consist between a control shaft 30 and two control shaft rollers 32, one of which is arranged in the interior of an intermediate lever member 20 each.
- the two control shaft rollers 32 are mounted in the intermediate lever members 20 and are located between the camshaft pulley 24 of the respective intermediate lever member 20 and an opposite to the camshaft pulley 24 end of the intermediate lever member 20 working cam contour 34 which abuts against a cam follower roller 36 of the roller cam follower 14.
- a spring element 44 is used in the form of a double leg spring according to the invention.
- This has two oppositely wound helices 46, which are connected via an intermediate leg 48 with a U-shaped reversal 5.
- the spring element 44 has end legs 50.
- this spring element 44 is arranged and designed such that its intermediate leg 48 is fastened in a bearing housing fixedly arranged on the intermediate leg receptacle 52, which is arranged between the two intermediate lever members 20, the link 28 and the roller towing levers 14. From here, the wires of the spring element extend in opposite axial directions to the respective intermediate side of the roller rocker arm 14 for intermediate leg receptacle 52. Approximately in extension of the axis 35 of the rocker arm rollers 36, the respective helix 46 of the spring element is formed outside the intermediate lever 12.
- helices 46 each extend the end legs 50 of the spring element 44 approximately in the extension direction of the intermediate lever members 20 and that to the end of the intermediate lever members 20 beyond the axis 22 of the camshaft rollers 24, where in each case a projection 54 is formed, which a contact surface 56, against which a bent end 58 of the end leg 50 is biased in the direction of the camshaft 10.
- the projection 54 is to be arranged on the intermediate lever 12 such that a component of the spring force points in the direction of the link 28.
- Control shaft roller 32 is pressed against the control shaft 30.
- the spring element 44 produces a defined position of the intermediate lever 12 via the three or five support points on the intermediate lever 12.
- the already loaded by high forces in operation control shaft roller 32 and control shaft 30 is not burdened by excessive forces, as would be the case w re, when the force would be introduced from the opposite side of the intermediate lever 12.
- This spring element 44 has in comparison to the first embodiment, two helices 46, which are located directly axially adjacent to each other, so that the axis of the helices 46 as well as the intermediate leg! 48 between the gate 28, the camshaft 10, the two intermediate lever members 20 and the roller cam followers 14 is arranged and is located on the opposite to the control shaft 30 side of the intermediate lever 12.
- the end legs 50 have between the two intermediate lever members 20 past them and biased behind a projection 54, which on the camshaft 10 and substantially also to working cam contour 34 opposite side of the respective intermediate lever member 20.
- This projection 54 is arranged so that resulting force vector has a component which points in the direction of the camshaft 10 and has a component which points in the direction of the guide 28.
- a torque is generated about the axis 22, by which a contact force between the control shaft roller 32 and the control shaft 30 is formed.
- this spring element is somewhat more expensive to assemble, it requires less installation space.
- a secure system of the intermediate lever is ensured in the required support points with only one spring element. The contact forces are distributed so that no overloading of the rollers or bearings is to be feared. The installation effort and the required installation space are minimized.
- the two helices can also be arranged above the gate on the opposite side to the camshaft and engage behind the corresponding projection on the one hand to generate the contact force against the camshaft and the link and on the other hand the torque about the camshaft axis, through which the control shaft roller against the control shaft is charged.
- the spring assembly for differently constructed variable valve trains or engines are suitable, so that, for example, a different number of intake valves per cylinder is needed. Further modified arrangements are conceivable within the scope of the main claim.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE201310106646 DE102013106646A1 (en) | 2013-06-25 | 2013-06-25 | Spring arrangement for a variable valve train of an internal combustion engine |
PCT/EP2014/056799 WO2014206591A1 (en) | 2013-06-25 | 2014-04-04 | Spring arrangement for a variable valve drive of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3014080A1 true EP3014080A1 (en) | 2016-05-04 |
EP3014080B1 EP3014080B1 (en) | 2017-06-07 |
Family
ID=50439389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14715302.7A Not-in-force EP3014080B1 (en) | 2013-06-25 | 2014-04-04 | Spring arrangement for a variable valve drive of an internal combustion engine |
Country Status (4)
Country | Link |
---|---|
US (1) | US9784142B2 (en) |
EP (1) | EP3014080B1 (en) |
DE (1) | DE102013106646A1 (en) |
WO (1) | WO2014206591A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016220397A1 (en) * | 2016-10-18 | 2017-08-10 | Schaeffler Technologies AG & Co. KG | Intermediate lever of a variable valve train |
EP3808968A1 (en) * | 2019-10-16 | 2021-04-21 | Volvo Car Corporation | An arrangement for transferring force from a camshaft to an output device |
DE102020101555A1 (en) * | 2020-01-23 | 2021-07-29 | Bayerische Motoren Werke Aktiengesellschaft | Stroke variable valve train with a double leg spring |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6868811B2 (en) * | 2002-06-13 | 2005-03-22 | Delphi Technologies, Inc. | Frameless variable valve actuation mechanism |
JP2004052604A (en) * | 2002-07-17 | 2004-02-19 | Kazuhiro Kanamaru | Valve drive mechanism of internal combustion engine, and intake air flow adjusting device thereof |
DE10235400A1 (en) | 2002-08-02 | 2004-02-19 | Bayerische Motoren Werke Ag | Cylinder head for an internal combustion engine with a variable stroke valve train |
DE102004003327A1 (en) * | 2004-01-22 | 2005-09-29 | Entec Consulting Gmbh | Variable valve lift device for internal combustion engine, has rotatable eccentric shaft having eccentrics contours positioned within circle formed by external diameter of bearings of eccentric shaft |
JP4278590B2 (en) * | 2004-08-31 | 2009-06-17 | 株式会社日立製作所 | Variable valve operating device for internal combustion engine |
DE102004049538A1 (en) * | 2004-10-10 | 2006-04-13 | Rolf Jung | Fully variable lift valve controller for internal combustion engine has intermediate element in form of pivotable rocker arm acted upon by cam or camshaft at first engagement surface with control block at free end |
DE102004058106A1 (en) * | 2004-12-01 | 2006-06-08 | Rolf Jung | Fully variable lifting valve controller for combustion engine has intermediate element with rocker arm interacting with pawl in pivotable manner at coupling axis, acted upon by cam/camshaft at engagement surface, control block at free end |
DE102005040959A1 (en) * | 2005-08-30 | 2007-03-08 | Bayerische Motoren Werke Ag | Hubvariabler valve drive for an internal combustion engine |
DE102007047582A1 (en) | 2007-10-04 | 2009-04-09 | Hydraulik-Ring Gmbh | Device for controlling the residual gas content of cylinders of an internal combustion engine |
DE102010009399A1 (en) * | 2010-02-26 | 2011-09-01 | Schaeffler Technologies Gmbh & Co. Kg | Operating lever for stroke-variable gas exchange valve gear of internal-combustion engine, has lever housing, which is formed with two side panels and base, which is connected with side panels |
DE102010048708A1 (en) | 2010-10-19 | 2012-04-19 | Kolbenschmidt Pierburg Innovations Gmbh | Mechanically controllable valve train |
DE102012002026A1 (en) | 2012-02-03 | 2013-08-08 | Volkswagen Aktiengesellschaft | Variable-stroke valve drive for internal combustion engine, has eccentric shaft with eccentric cams having angular range, in which stroke of valve and of similar valve group vary differently from each other |
-
2013
- 2013-06-25 DE DE201310106646 patent/DE102013106646A1/en not_active Ceased
-
2014
- 2014-04-04 WO PCT/EP2014/056799 patent/WO2014206591A1/en active Application Filing
- 2014-04-04 EP EP14715302.7A patent/EP3014080B1/en not_active Not-in-force
- 2014-04-04 US US14/899,560 patent/US9784142B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US20160146066A1 (en) | 2016-05-26 |
US9784142B2 (en) | 2017-10-10 |
WO2014206591A1 (en) | 2014-12-31 |
EP3014080B1 (en) | 2017-06-07 |
DE102013106646A1 (en) | 2015-01-08 |
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