EP4093951A1 - Hubvariabler ventiltrieb mit einer doppelschenkelfeder - Google Patents
Hubvariabler ventiltrieb mit einer doppelschenkelfederInfo
- Publication number
- EP4093951A1 EP4093951A1 EP20833755.0A EP20833755A EP4093951A1 EP 4093951 A1 EP4093951 A1 EP 4093951A1 EP 20833755 A EP20833755 A EP 20833755A EP 4093951 A1 EP4093951 A1 EP 4093951A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- spring
- stroke
- valve drive
- double leg
- leg 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.)
- Withdrawn
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 10
- 238000011900 installation process Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 abstract 1
- 210000002414 leg Anatomy 0.000 description 66
- 239000000543 intermediate Substances 0.000 description 21
- 238000004804 winding Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000000689 upper leg Anatomy 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
- F01L13/0063—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
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
- F01L2001/467—Lost motion springs
-
- 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
-
- 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
- F01L2305/02—Mounting of rollers
Definitions
- the invention relates to a variable-stroke valve drive with a double leg spring in a cylinder head of an internal combustion engine with the features from the preamble of claim 1.
- a generic double leg spring for a variable stroke valve operated in a cylinder head of an internal combustion engine is known, for example, from the German patent application DE 101 22 152 A1.
- the double leg spring consisting of at least a first and a second leg spring, which are arranged largely coaxially to a common spring axis, and the first leg spring is shown egg NEN first spring leg and the second leg spring have a second spring leg, the winding directions of the first and second leg springs are opposite and the first and second leg springs in the area of reversal of the winding direction together form a common intermediate leg that connects with a portion of the cylinder head can be connected, the assembly aid releasably connecting the first and second spring legs to the intermediate leg in a preloaded active position.
- the assembly aid enables the double leg spring to be assembled without risk and without problems in a stroke-variable valve drive in a cylinder head of an internal combustion engine.
- a variable-stroke valve drive for an internal combustion engine is known.
- the stroke-variable valve drive for an internal combustion engine has at least a first and a second cylinder and gas exchange valves with the same effect, each cylinder being assigned a gas exchange valve actuation unit.
- This gas exchange valve actuation unit consists of at least:
- An intermediate lever which on the one hand is slidably mounted on a link path of a link and on the other hand has a working curve, the working curve being in operative connection via an intermediate element with a gas exchange valve, a first adjusting device for rotating the intermediate lever around a point near the gate against a spring force Spring element is provided, the intermediate lever being displaceable with a second adjusting device along the slide track, the second adjusting device having a first setting point for a zero stroke, at least a second setting point for a partial stroke and a third setting point for a full stroke of the gas exchange valve, and the Gas exchange valve of the first cylinder is assigned a first second adjusting device and the gas exchange valve of the second cylinder is assigned a second second adjusting device.
- a variable stroke valve drive with a double leg spring in a cylinder head of an internal combustion engine comprises a pivot lever, which is supported on the one hand with a roller element with a swing pivot point on a link path of a gate and on the other hand with a control path on an intermediate element to a gas exchange valve without play.
- the pivot lever can be pivoted between the support points in a controlled manner by a cam of a camshaft against a force of the double leg spring on the one hand and the pivot point is controlled by an adjusting device for the flight height adjustment parallel to the gate track on the other hand.
- the double leg spring forms an intermediate leg in its middle area with a reversal of the direction of rotation of the two spring legs, the double leg spring being mountable in the area of the intermediate leg.
- variable-stroke valve drive with a double leg spring design with spring legs with an S-stroke, the spring legs engaging the contact surface on the pivot lever from “above” and must be inserted into the lateral guide tabs of the pivot lever during assembly from the "rear”.
- one or both legs of the spring legs may not be correctly inserted onto the contact surface of the pivot lever, but rather rest on the sides of the Stirnflä surfaces of the lateral guide tabs.
- the spring leg slides down the side of the intermediate lever and then grinds on the camshaft.
- the variable lift function of the variable lift valve train is therefore no longer guaranteed. This leads to wear of the camshaft tube due to the spring leg and the camshaft can break.
- the object of the present invention is to avoid the problems mentioned above. This object is achieved by the feature in the characterizing part of the claim 1 Pa.
- the contact of the spring legs of the double leg spring is modified from a vertical arrangement (S-impact) to a horizontal arrangement.
- the distance between the Fe derschenkels in the area of the intermediate lever to the eccentric, the adjusting element is significantly increased and thus an increase in the angle of rotation of the eccentric shaft is possible (up to 300 °).
- the configuration according to the invention also leads to an improvement in assembly.
- the L-shaped spring leg of the double leg spring only needs to be placed on the corresponding contact surface of the intermediate lever.
- no additional positioning of the spring leg is necessary and thus no incorrect assembly is possible.
- FIG. 1 shows a plan view of a section of a generic stroke-variable valve drive according to the prior art.
- Fig. 2 shows a side view of a variable lift valve drive according to the invention in comparison with the prior art.
- FIG. 3 shows a plan view of the variable-lift valve drive according to FIG.
- Fig. 1 shows a plan view of a section of a generic hub variable valve drive 1 with a double leg spring 2 according to the prior art.
- the section is provided for two gas exchange valves 9, only one gas exchange valve 9 being numbered.
- This valve drive 1 can be installed in a cylinder head (not shown) of an internal combustion engine and is known from the prior art, DE 102006033559 A1.
- the valve drive 1 comprises a pivot lever 3, which is supported on the one hand with a roller element 4 with a pivot point on a slide track 5 of a gate 6 and on the other hand with a control track 7 on an intermediate element 8, a roller rocker arm, on a gas exchange valve 9 without play.
- the intermediate element 8 is ge compared to the gas exchange valve 9 on a lash adjuster 13, preferably a hydraulic lash adjuster 13, supported.
- the pivot lever 3 can be pivoted between the support points on the one hand by a cam, not shown, of a camshaft against egg ner force of the double leg spring 2 and, on the other hand, the pivot point of an adjusting device 10, an eccentric shaft, can be displaced in a controlled manner parallel to the slide track 5 for flub height adjustment.
- the double leg spring 2 forms an intermediate leg 11, with a reversal of the direction of rotation of the two spring legs 2a, 2b (2b is not numbered because it cannot be seen), the intermediate leg 11 being encased by a mounting plate.
- the double leg spring 1 can be attached either to the cylinder head or to a shaft bearing not provided.
- the known double leg spring design has spring legs 2a, 2b with an S-flap, with the spring legs 2a, 2b engaging the contact surfaces on the pivot lever 3 from “above” and, during assembly, from “behind” in lateral, not numbered guide tabs of the pivot lever 3 are introduced.
- Fig. 2 shows a side view of a variable lift valve drive 1 according to the invention in comparison with the prior art.
- the same facts apply to FIG. 2 as for FIG. 1.
- the spring leg 2a at the bottom in the drawing corresponds to the prior art embodiment
- the spring leg 2b at the top in the drawing corresponds to the embodiment according to the invention.
- the end of the spring leg 2b is largely reshaped parallel to a longitudinal axis 12 of the double leg spring 2 in this comparison.
- the spring leg 2b is reshaped in NEN. In a further embodiment, the spring leg 2b can also be shaped outward.
- the spring leg 2b is deformed by approximately 90 °, larger or smaller deformation angles also being possible.
- the pivot lever 3 has a corresponding support surface 13 for each end of the spring legs 2a, 2b according to the invention.
- Fig. 3 shows a plan view of the variable lift valve train 1 according to the inven tion in comparison to the prior art. The same applies as was said for FIG. 2.
- both spring legs 2a, 2b of the double leg spring 2 have the L-shape and the pivot lever 3 has a support surface 13 for each spring leg 2a, 2b.
- the configuration according to the invention also leads to an improvement in assembly.
- the L-shaped spring leg 2b of the double leg spring 2 only needs to be placed on the corresponding support surface 13 of the intermediate lever 3.
- no additional positioning of the spring leg 2b is necessary and therefore no incorrect assembly is possible.
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 |
|---|---|---|---|
| DE102020101555.0A DE102020101555A1 (de) | 2020-01-23 | 2020-01-23 | Hubvariabler Ventiltrieb mit einer Doppelschenkelfeder |
| PCT/EP2020/086077 WO2021148199A1 (de) | 2020-01-23 | 2020-12-15 | Hubvariabler ventiltrieb mit einer doppelschenkelfeder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4093951A1 true EP4093951A1 (de) | 2022-11-30 |
Family
ID=74105990
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20833755.0A Withdrawn EP4093951A1 (de) | 2020-01-23 | 2020-12-15 | Hubvariabler ventiltrieb mit einer doppelschenkelfeder |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20230075127A1 (de) |
| EP (1) | EP4093951A1 (de) |
| CN (1) | CN114729578A (de) |
| DE (1) | DE102020101555A1 (de) |
| WO (1) | WO2021148199A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102024111158B3 (de) * | 2024-04-22 | 2025-05-22 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines hubvariablen Ventiltriebs einer Brennkraftmaschine |
| DE102024123018A1 (de) * | 2024-08-13 | 2026-02-19 | Schaeffler Technologies AG & Co. KG | Zwischenhebel für einen hubvariablen Ventiltrieb einer Brennkraftmaschine |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10122152B4 (de) | 2001-05-08 | 2005-07-21 | Bayerische Motoren Werke Ag | Montagehilfe und ein Verfahren zur Montage und Demontage für eine Schenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine |
| DE10123186A1 (de) * | 2001-05-12 | 2002-11-14 | Bayerische Motoren Werke Ag | Ventiltrieb-Vorrichtung zur variablen Hubverstellung eines Gaswechselventils einer Brennkraftmaschine |
| US6745734B2 (en) | 2002-05-24 | 2004-06-08 | Delphi Technologies, Inc. | Variable valve actuating mechanism having torsional lash control spring |
| DE102006029178A1 (de) * | 2006-06-24 | 2007-12-27 | Bayerische Motoren Werke Ag | Schlepphebel |
| DE102006033559A1 (de) | 2006-07-20 | 2008-01-24 | Bayerische Motoren Werke Ag | Hubvariabler Ventiltrieb für eine Brennkraftmaschine |
| DE102011082226A1 (de) | 2011-09-07 | 2013-03-07 | Bayerische Motoren Werke Aktiengesellschaft | Doppelschenkelfeder für einen hubvariablen Ventiltrieb in einem Zylinderkopf einer Brennkraftmaschine |
| DE102013106646A1 (de) * | 2013-06-25 | 2015-01-08 | Pierburg Gmbh | Federanordnung für einen variablen Ventiltrieb einer Verbrennungskraftmaschine |
| DE102016220397A1 (de) | 2016-10-18 | 2017-08-10 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102016220396A1 (de) | 2016-10-18 | 2017-08-10 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102016220401A1 (de) | 2016-10-18 | 2017-09-07 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102016220394B3 (de) | 2016-10-18 | 2017-12-28 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102016223087A1 (de) | 2016-11-23 | 2017-10-26 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102016223086A1 (de) | 2016-11-23 | 2018-05-24 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102016223088A1 (de) | 2016-11-23 | 2018-05-24 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
| DE102017110171A1 (de) | 2017-05-11 | 2018-11-15 | Schaeffler Technologies AG & Co. KG | Zwischenhebel eines variablen Ventiltriebs |
-
2020
- 2020-01-23 DE DE102020101555.0A patent/DE102020101555A1/de not_active Withdrawn
- 2020-12-15 US US17/794,755 patent/US20230075127A1/en not_active Abandoned
- 2020-12-15 EP EP20833755.0A patent/EP4093951A1/de not_active Withdrawn
- 2020-12-15 WO PCT/EP2020/086077 patent/WO2021148199A1/de not_active Ceased
- 2020-12-15 CN CN202080079356.2A patent/CN114729578A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20230075127A1 (en) | 2023-03-09 |
| WO2021148199A1 (de) | 2021-07-29 |
| CN114729578A (zh) | 2022-07-08 |
| DE102020101555A1 (de) | 2021-07-29 |
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Legal Events
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| DAX | Request for extension of the european patent (deleted) | ||
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