EP3011148A1 - Verfahren zur herstellung von ventilgleichhüben an variablen ventiltrieben - Google Patents
Verfahren zur herstellung von ventilgleichhüben an variablen ventiltriebenInfo
- Publication number
- EP3011148A1 EP3011148A1 EP14708531.0A EP14708531A EP3011148A1 EP 3011148 A1 EP3011148 A1 EP 3011148A1 EP 14708531 A EP14708531 A EP 14708531A EP 3011148 A1 EP3011148 A1 EP 3011148A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- control shaft
- gas exchange
- lift
- valve lift
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000013643 reference control Substances 0.000 claims abstract description 17
- 238000005259 measurement Methods 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 238000003754 machining Methods 0.000 abstract 1
- 238000012545 processing Methods 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000000523 sample Substances 0.000 description 3
- 238000012805 post-processing Methods 0.000 description 2
- 241001233037 catfish Species 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002699 waste material 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
- F01L13/0063—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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
- B24B19/08—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section
- B24B19/12—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding non-circular cross-sections, e.g. shafts of elliptical or polygonal cross-section for grinding cams or 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
- F01L2820/00—Details on specific features characterising valve gear arrangements
- F01L2820/04—Sensors
- F01L2820/045—Valve lift
Definitions
- the invention relates to a method for the production of equal valve strokes on variable valve drives, wherein a control shaft to be machined is inserted into a grinding machine and the control cam lobes are abraded according to stored values.
- Control shafts are used in variable valve trains, as have become known for example under the terms univalve or valvetronic, to change the valve lift curve.
- cams are arranged on the control shafts, which abut against rollers of a rocker arm, which performs a modified tilting movement depending on the position of the cam of the control shaft.
- the disadvantage is thus the high cost of the classification of the items and the high cost of rework or re-production due to cumulative tolerances noticeable.
- the characteristic field is determined by tests with reference intermediate levers and reference roller towing levers.
- These reference intermediate levers and reference roller follower levers, as well as the reference camshaft and the reference control shaft, are fully measured and correspondingly have dimensions corresponding to the optimum components. With these components, it can be determined by experiments for which modified control shaft diameter, which valve lift changes follow. On this catfish, the required characteristic is determined in advance. It is advantageous if the map is stored in a control unit of the grinding machine, so that no additional controls must be used. This is easily possible if a CNC machine is used as the grinding machine, which in any case uses electronically stored data. Furthermore, automated processing is possible with such a machine.
- Reference valves for measuring are preferably arranged in the measuring device. Since the largest deviations occur due to tolerances on the levers and the control shaft, the use of reference valves, the effort in preparing for the measurement is kept low, since always the same valves can be used for many consecutive measurements.
- the measurement is performed in a defined reference position of the reference control shaft.
- the reference control shaft can be inserted so firmly in the Messvorrlchtung.
- the reference position of the reference control shaft is the position in which this causes a minimum stroke of the valves. Accordingly, the adjustment is made again in the most critical operating point, as unequal valve strokes have undesirable consequences, especially in operating conditions with low valve strokes. This in turn improves the accuracy of the adjustment. Furthermore, it is advantageously possible to make several measurements in different defined positions of the reference control shaft for equalizing the data measured by the measuring device. Accordingly, measurement errors can be determined and thus ensured that the waste is minimized by incorrect processing of the control shaft. Further, it would be possible to machine differently the cams of the control shaft over their circumference, if necessary, by taking the results of a plurality of positions and accordingly grinding the control shaft.
- Figure 1 shows a schematic representation of the measurement and the following processing.
- the inventive method uses a measuring device 10, in which a reference camshaft 12, a reference control shaft 14 and four reference scenes 16 inserted in the present embodiment are. Furthermore, there are 10 receptacles for eight reference gas exchange valves 18 in the measuring device.
- the measuring device 10 has a measuring probe 20 for each gas exchange valve 18, via which the deflection of each gas exchange valve 18 in the measuring device 10 can be measured from a reference zero point.
- the probes 20 are connected via a data cable 22 to a control unit 24, which is either connected to a CNC grinding machine 26 via another data cable 22 or in the CNC Schleifmaschlne 26 is integrated.
- variable valve train in the measuring device 10 is completed by four intermediate lever 28 and eight roller rocker arms 30 are inserted into the measuring device 10 and loaded by four double torsion springs 32 in a known manner against the reference gate 16, the reference camshaft 12 and the reference control shaft 14, so that a complete valve train is created.
- the control shaft 34 to be machined as well as the intermediate levers 28 and the roller rocker arms 30 are later installed together in an internal combustion engine and exactly at the positions where they are arranged in the measuring device 10 and cooperate.
- the components are marked accordingly, for example by matrix lasers.
- the measurement process starts by turning the reference camshaft 12 once or several times. This rotation has a valve stroke at each individual reference gas exchange valve 18 result, which is received via the probe 20 and is passed through the kabei 22 to the control unit 24.
- the reference control shaft 14 is in the rotational position in which it causes the smallest valve lift.
- the reference gas exchange valve 18 is determined with the smallest valve lift and the valve lift differences .DELTA.x this reference gas exchange valve 18 is calculated to all other reference gas exchange valves 18.
- This valve lift difference .DELTA.x corresponds in each case to a center distance difference .DELTA.d in comparison to a nominal dimension of the control shaft 34.
- the corresponding characteristic curve is previously determined by means of tests with reference intermediate levers and reference roller follower levers, so that this determined ⁇ x / ⁇ d characteristic can be stored in the control unit 24.
- the CNC grinding machine 26 now processes the control shaft 34 to be machined so that the portions of the control shaft 34, which cooperate with a gas exchange valve 18, so the camshaft cam 36, which do not have the smallest valve lift, not only ground to nominal size, but in addition to the calculated center distance difference ⁇ d.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE201310106515 DE102013106515B3 (de) | 2013-06-21 | 2013-06-21 | Verfahren zur Herstellung von Ventilgleichhüben an variablen Ventiltrieben |
| PCT/EP2014/054262 WO2014202241A1 (de) | 2013-06-21 | 2014-03-05 | Verfahren zur herstellung von ventilgleichhüben an variablen ventiltrieben |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3011148A1 true EP3011148A1 (de) | 2016-04-27 |
| EP3011148B1 EP3011148B1 (de) | 2017-05-10 |
Family
ID=50238379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP14708531.0A Not-in-force EP3011148B1 (de) | 2013-06-21 | 2014-03-05 | Verfahren zur herstellung von ventilgleichhüben an variablen ventiltrieben |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3011148B1 (de) |
| DE (1) | DE102013106515B3 (de) |
| WO (1) | WO2014202241A1 (de) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116175345B (zh) * | 2023-02-10 | 2023-11-21 | 扬州江峰机械制造有限公司 | 气门推杆清洁打磨器 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB854498A (en) * | 1956-01-24 | 1960-11-23 | Birmingham Small Arms Co Ltd | Improvements in or relating to the gauging of cam profiles |
| DE10258277A1 (de) * | 2002-12-13 | 2004-06-24 | Mahle Ventiltrieb Gmbh | Steuereinrichtung für Gaswechselventile eines Verbrennungsmotors |
| DE10304991A1 (de) * | 2003-02-07 | 2004-08-19 | Ina-Schaeffler Kg | Verstellmittel in einem variablen Ventiltrieb einer Brennkraftmaschine |
| DE10323665B4 (de) * | 2003-05-14 | 2009-02-05 | Hydraulik-Ring Gmbh | Variable Ventilhubvorrichtung zur Hubverstellung der Gaswechselventile einer Verbrennungskraftmaschine |
| DE102004053208A1 (de) * | 2004-11-04 | 2006-07-20 | Schaeffler Kg | Vollvariable mechanische Ventilsteuerung mit einer Verstellwelle |
| DE102010048709B4 (de) * | 2010-10-19 | 2013-01-03 | Kolbenschmidt Pierburg Innovations Gmbh | Mechanisch steuerbarer Ventiltrieb sowie mechanisch steuerbare Ventiltriebanordnung |
| DE102011003022A1 (de) * | 2011-01-24 | 2012-07-26 | Schaeffler Technologies Gmbh & Co. Kg | Verfahren zur Erzielung eines gleichmäßigen Füllungsgrades der Zylinder eines Verbrennungsmotors |
-
2013
- 2013-06-21 DE DE201310106515 patent/DE102013106515B3/de not_active Expired - Fee Related
-
2014
- 2014-03-05 EP EP14708531.0A patent/EP3011148B1/de not_active Not-in-force
- 2014-03-05 WO PCT/EP2014/054262 patent/WO2014202241A1/de not_active Ceased
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2014202241A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014202241A1 (de) | 2014-12-24 |
| EP3011148B1 (de) | 2017-05-10 |
| DE102013106515B3 (de) | 2014-12-24 |
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