EP1506345A1 - Drive and displacement system for variable valve-controlled distribution - Google Patents
Drive and displacement system for variable valve-controlled distributionInfo
- Publication number
- EP1506345A1 EP1506345A1 EP03725134A EP03725134A EP1506345A1 EP 1506345 A1 EP1506345 A1 EP 1506345A1 EP 03725134 A EP03725134 A EP 03725134A EP 03725134 A EP03725134 A EP 03725134A EP 1506345 A1 EP1506345 A1 EP 1506345A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drive
- valve
- cam
- lever
- actuating
- 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
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
- F01L1/12—Transmitting gear between valve drive and valve
- F01L1/18—Rocking arms or levers
-
- 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
- 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
Definitions
- the present invention relates to a drive and adjustment system for mechanically variable valve controls with a pivotally mounted pivot lever on a shaft or axle, which actuates the valves by engaging the role or contact surface of a rocker arm, the shaft or axle in with the cylinder head firmly connected bearings is arranged.
- the swivel levers can also drive rocker or angle levers.
- valve controls can be set in accordance with the invention in such a way that the valves are actuated continuously from being kept closed all the way up to the largest intended valve lift with a valve opening duration which increases continuously as the valve lift increases. This makes the valve controls suitable for throttle-free load control.
- the valve controls can also operate a plurality of valves at the same time, it also being possible for only one valve in a work space to be actuated while the other valve in the work space is kept constantly closed.
- the swivel levers are driven by a drive lever which drives the swivel lever with its lower end via a swivel joint, the drive lever engaging at its upper end with a cam or its contact surface in an actuating cam of an actuating camshaft and tediously via a cam roller or its contact surface is driven by a cam.
- the drive lever likewise drives the pivot lever via a swivel joint with its lower end, but the drive lever at its upper end via a cam roller or its contact surface by one Cam is driven and engages in the center by means of a roller or its contact surface in an actuating cam of an actuating camshaft.
- valve controls By driving the pivoting lever by means of a separate drive lever, the manufacture of mechanically variable valve controls is made possible in a simple and space-saving design, the valve controls being largely pre-assembled and being able to be inserted into the cylinder head in a simple manner.
- Valve opening times can be assigned.
- Fig. 1 shows a valve control in a side view with a drive and adjustment system formed by a drive lever, the drive lever being driven approximately in the middle via a cam roller; with one on its top
- End arranged roller engages in a non-rotatably mounted on an actuating camshaft actuating cam and drives a pivoted on the actuating camshaft pivot lever mounted on its lower end.
- the valve control is shown in Fig. 1 in the position of the valves being kept permanently closed.
- Fig. 2 shows the valve control of Fig. 1 in a side view in the position of the largest valve lift and the longest valve opening time.
- Fig. 3 shows a valve control in side view with a through
- Drive lever formed drive and adjustment system, the drive lever being driven at its upper end via a cam roller; with an about centrally arranged roller engages in a control cam mounted on a control camshaft and drives a pivot lever mounted on the control camshaft via a rotary joint arranged at its lower end.
- the valve control is shown in FIG. 3 in the position of the valves being kept permanently closed.
- FIG. 4 shows the valve control of FIG. 3 in a side view in the position of the largest valve lift and the longest valve opening time.
- the pivot levers can also be rotatably supported on a separate axis which is fixedly connected to the cylinder head.
- the valve controls have a drive lever which is supported at its upper end on a control cam of a control camshaft provided only as a control shaft by means of a roller and drives the swivel lever via the swivel joint arranged at its lower end in that the drive lever itself is driven by a cam via a cam roller arranged between the roller engaging in the adjusting cam and the swivel joint.
- the drive lever can also be driven by a cam at its upper end via a cam roller, the drive lever having the roller which engages in the actuating cam of the actuating camshaft between the cam roller and the swivel joint arranged at the lower end of the drive lever.
- Cam intervention is possible here from both longitudinal sides of the drive lever, the support by the actuating cam always taking place on the side opposite the cam engagement.
- the space requirements of the valve controls with the separate axis on which the pivot levers are mounted are considerably larger.
- the control camshaft can be advantageously forged or cast in one piece.
- the actuating cams are connected in a rotationally fixed manner to the actuating camshaft via a pin-rivet or screw connection, in order to avoid split bearings in the pivoting levers.
- the actuating camshaft can be inserted as a unit in the cylinder head with the swivel levers mounted on it and with the drive levers connected to the swivel levers via the swivel joint and assembled there.
- the swivel levers are arranged in split bearings on an axle in the cylinder head, the axle with the swivel levers, with the drive levers connected to the swivel levers via the swivel joint and with the actuating camshaft connected with the drive levers can be inserted as a unit in the cylinder head and mounted there , even if the bearings of the
- Control camshaft are also split.
- Fig. 1 shows a mechanically variable valve control in the setting of the constant keeping closed of the valve 1, in which a pivot lever 2, which is rotatably mounted on a camshaft 3 and from one for the drive and
- Setting provided drive lever 4 is pivoted via a swivel 5.
- the swivel joint 5 is arranged at the lower end of the drive lever 4 and in the vicinity of the contact surface of the swivel lever 2 formed from two regions 6 and 7, and the actuating camshaft 3 serving as the mounting of the swivel lever 2 is arranged in bearings firmly connected to the cylinder head 8.
- a rocker arm 9 actuating the valve 1 is driven via its roller 10 by the contact surface of the pivot lever 2 formed from two regions 6 and 7, the rocker arm 9 also being able to be driven via a contact surface.
- the control camshaft 3 has a control cam 11 connected to it in a rotationally fixed manner, into which the drive lever 4 engages with a roller 12 arranged at its upper end.
- the drive lever 4 has a cam roller 13 between the swivel joint 5 and the roller 12, in which a cam 14 engages.
- the area 6 of the contact surface of the pivot lever 2 runs in a circle around the axis of rotation of the control shaft 3 and is provided for the valve 1 to be kept closed at all times.
- the area 7 of the contact surface of the pivot lever 2 has an inwardly curved, nose-shaped curvature and is provided for the actuation of the valve 1.
- the roller 12 of the drive lever 4 engages in the base circle of the control cam 11 arranged on the actuating camshaft 3, the cam roller 13 is located on the base circle of the cam 14 and the roller 10 of the rocker arm 9 is at point A, the starting point of area 6 the contact surface of the swivel lever 2. While the drive lever 4 is driven by the cam 14, the swivel lever 2 engages with its region 6 of its contact surface running circularly around its axis of rotation in the roller 10 of the swivel lever 9 a back and forth movement between point A and point B, wherein the valve 1 is not operated.
- Elevation curve of the cam 14 shifts the engagement of the roller 10 of the rocker arm 9 in the direction of point B.
- valve lift increases and the valve opening duration increases.
- the size of the valve stroke and the length of the valve opening duration dependent on this depend on the values of the engagement of the roller 10 of the rocker arm 9 in the nose-shaped region 7 of the contact surface of the rocker arm 2.
- Adjusting arm 17 has a spring plate 19.
- the actuating arm 17 can be combined with the actuating cam 11 to form a component in a simple manner.
- the drive lever 4 also executes a longitudinal movement in addition to its pivoting movement; whereby the drive lever 4 with its roller 12 on the adjusting cam 11 back and forth
- a control cam 11 having a plurality of contact surfaces can advantageously be arranged in a rotationally fixed manner on the control camshaft 3, as a result of which the
- the elevation curves of the contact surfaces of the actuating cam 11 can be curved inwards, curved outwards, rectilinear or S-shaped, as a result of which different lengths of valve stroke are set
- Valve opening times can be provided with different valve lift curves and an engine can be operated in different work programs.
- the contact surface of the actuating cam 11 provided for the largest valve lift can be connected by means of a contact surface here Circular arc are extended, which has the center of rotation of the actuating camshaft 3, whereby the valve lift curve can be changed by means of a rotation of the actuating camshaft 3 due to the changed width of the engagement of the roller 12 of the drive lever 4 in the circular arc of the contact surface of the actuating cam 11 during the largest valve lift can.
- Valve controls are designed in such a way that, by rotating the control camshaft 3 through the drive levers 4, first a pivot lever 2 for the actuation of a valve 1 and then for the upper power range the other pivot lever 2 for the actuation of the other valve 1 is set, after which both valves 1 operated simultaneously.
- the engine can also advantageously be operated alternately with an inlet channel, an inlet channel with a small diameter and a valve 1 with the small plate diameter being used for operating the engine when idling and in the lower power range and for the medium power range after switching the valve 1 with the smaller plate diameter into a constant closed holding an inlet duct with the larger diameter and a valve 1 with the larger plate diameter can be used for the operation of the engine.
- This is also due to the different diameters of the two inlet channels and the valves
- valves 1 advantageously creates a swirl of the intake air in the upper power range when both valves 1 are actuated.
- Fig. 2 shows the valve control in the setting of the largest valve lift and the longest valve opening time, the roller 12 of the drive lever 4 being at the highest fixed point on the elevation curve of the actuating cam 11 and the cam roller 13 engaging in the base circle of the cam 14.
- the actuating arm 17 has turned with the rotation of the actuating camshaft 3 in the clockwise direction on the axis C, as a result of which the compression spring 16 has the greater length obtained as a result exerts a reduced restoring force on the pivot lever 2 in an advantageous manner.
- the drive lever 4 can drive a swivel lever 2 on both sides, which actuates a valve 1 via a swing lever 9.
- Fig. 3 shows a mechanically variable valve control in the setting of the constant keeping closed of the valve 20, in which a pivot lever 21, which is rotatably mounted on an actuating camshaft 22 and from a drive lever 23 provided for the drive and the adjustment via a pivot joint 24 in a
- Swivel movement is offset.
- the swivel joint 24 is arranged at the lower end of the drive lever 23 in the vicinity of the contact surface of the swivel lever 21 formed from two regions 25 and 26, and the control shaft 22 serving as the mounting of the swivel lever 21 is arranged in bearings which are firmly connected to the cylinder head 27.
- a rocker arm 28 which actuates the valve 20 is driven via its roller 29 by the contact surface of the pivot lever 21 formed from two regions 25 and 26, the rocker arm 28 also being able to be driven via a contact surface.
- the drive lever 23 has a cam roller 30 at its upper end, in which a cam 31 engages. Between the cam roller 30 and the pivot 24 of the
- Drive lever 23 is arranged a roller 32 which engages in a non-rotatably connected to the actuating camshaft 22 actuating cam 33.
- the area 25 of the contact surface of the pivot lever 21 extends in a circle around the axis of rotation of the actuating camshaft 22 and is provided for the valve 20 to be kept closed at all times.
- the area 26 of the contact surface of the pivot lever 21 has an inwardly curved, nose-shaped curvature and is provided for the actuation of the valve 20.
- the roller 32 of the drive lever 23 here engages in the base circle of the control cam 33 arranged on the actuating camshaft 22, the cam roller 30 is located on the base circle of the cam 31 and the roller 29 of the rocker arm 28 is at point A, the starting point of area 25 of the contact surface of the pivot lever 21.
- the pivot lever 21 While the drive lever 23 is driven by the cam 31, the pivot lever 21 with its area 25 of its contact surface that sells in a circular manner about its axis of rotation engages in the roller 29 of the pivot lever 28 in a reciprocating motion between point A and point B, with the valve 20 not being operated.
- Elevation curve of the cam 31 shifts the engagement of the roller 29 of the rocker arm 28 in the direction of point B.
- valve lift increases and the valve opening duration increases.
- the size of the valve stroke and the length of the valve opening duration dependent on this depend on the width of the engagement of the roller 29 of the rocker arm 28 in the nose-shaped region 26 of the contact surface of the rocker arm 21.
- a torsion spring 35 is arranged as a return spring on both sides of the pivot lever 21, one leg of which has the axis of the pivot joint 24 arranged on the pivot lever 21 and drive lever 23 and the other leg has a dome 37 arranged in the actuating arm 36 as an abutment.
- the actuating arm 36 can be combined with the actuating cam 33 to form a component in a simple manner.
- the drive lever 23 also executes a longitudinal movement in addition to its pivoting movement, as a result of which the
- Control cams 33 are arranged with a plurality of contact surfaces, whereby the roller 32 of the drive lever 23 by a corresponding rotation of the control camshaft
- the elevation curves of the contact surfaces of the actuating cam 11 can be curved inwards, curved outwards, straight or S-shaped, so that different valve opening times can be provided for different valve lift curves for each valve stroke length set and an engine can be operated in different work programs.
- the contact surface of the actuating cam 33 provided for the largest valve lift can be extended by means of an adjoining circular arc, which has the axis of rotation of the actuating camshaft 22 as the center point, as a result of which, by means of a rotation of the actuating camshaft 22 due to the changed width of the engagement of the roller 32 of the drive lever
- valve lift curve in the circular arc of the contact surface of the Stelinock 33 with the largest valve lift, the valve lift curve can be changed.
- Valve controls can be designed in such a way that a rotation of the actuating camshaft 22 by the drive levers 23 first causes a pivot lever 21 for the actuation of a valve 20 and subsequently for the upper power range the other pivot lever 21 for the
- Actuation of the other valve 20 is set, after which both valves 20 are operated simultaneously.
- the engine can also advantageously be operated alternately with an inlet channel, an inlet channel with a small diameter and a valve 20 with the small plate diameter being used for operating the engine at idle and in the lower power range and for the medium power range after switching the valve 20 with the smaller plate diameter into a constant closed position, an inlet channel with the larger diameter and a valve 20 with the larger plate diameter can be used for the operation of the engine.
- the different diameters of the two inlet channels and the valves 20 also advantageously produce a swirl of the intake air in the upper power range when both valves 20 are actuated.
- Fig. 4 shows the valve control in the setting of the largest valve lift and the longest valve opening time, the roller 32 of the drive lever 23 being at the highest fixed point on the elevation curve of the control cam 33 and the cam roller 30 engaging in the base circle of the cam 31.
- the actuating arm 36 has against the rotation of the actuating camshaft 22 Set clockwise on the axis D, whereby the torsion spring 35 advantageously exerts a reduced restoring force on the pivot lever 21 due to the resulting smaller preload.
- the drive lever 23 can drive a swivel lever 21 on both sides, which actuates a valve 20 via a swing lever 28.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Means For Warming Up And Starting Carburetors (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10221133A DE10221133A1 (en) | 2002-05-13 | 2002-05-13 | Drive and adjustment system for variable valve controls |
DE10221133 | 2002-05-13 | ||
PCT/EP2003/004627 WO2003095805A1 (en) | 2002-05-13 | 2003-05-02 | Drive and displacement system for variable valve-controlled distribution |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1506345A1 true EP1506345A1 (en) | 2005-02-16 |
EP1506345B1 EP1506345B1 (en) | 2005-11-30 |
Family
ID=29285321
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03725134A Expired - Lifetime EP1506345B1 (en) | 2002-05-13 | 2003-05-02 | Drive and displacement system for variable valve-controlled distribution |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1506345B1 (en) |
AT (1) | ATE311526T1 (en) |
AU (1) | AU2003227706A1 (en) |
DE (2) | DE10221133A1 (en) |
WO (1) | WO2003095805A1 (en) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0325278D0 (en) * | 2003-10-29 | 2003-12-03 | Ricardo Uk Ltd | Engine valvegear |
WO2005090758A1 (en) * | 2004-03-23 | 2005-09-29 | Mitsubishi Fuso Truck And Bus Corporation | Variable valve gear of internal combustion engine |
US6994063B2 (en) * | 2004-04-13 | 2006-02-07 | Mitsubishi Fuso Truck And Bus Corporation | Variable valve unit for internal combustion engine |
JP4221327B2 (en) * | 2004-04-13 | 2009-02-12 | 三菱ふそうトラック・バス株式会社 | Variable valve operating device for internal combustion engine |
JP4342372B2 (en) * | 2004-04-28 | 2009-10-14 | 本田技研工業株式会社 | Valve operating device for internal combustion engine |
JP4507997B2 (en) * | 2005-06-15 | 2010-07-21 | 三菱自動車工業株式会社 | Variable valve operating device for internal combustion engine |
DE102005035315B4 (en) * | 2005-07-28 | 2007-05-10 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Variable valve train for internal combustion engines |
JP5028952B2 (en) * | 2006-10-24 | 2012-09-19 | トヨタ自動車株式会社 | Valve mechanism of internal combustion engine |
JP4380695B2 (en) * | 2006-12-18 | 2009-12-09 | トヨタ自動車株式会社 | Internal combustion engine with variable valve mechanism |
ITMI20070443A1 (en) * | 2007-03-05 | 2008-09-06 | Piaggio & C Spa | SYSTEM FOR THE CONTINUOUS VARIATION OF THE VALVE AND STAGE OF THE VALVES IN AN INTERNAL COMBUSTION ENGINE |
DE102008034092A1 (en) * | 2008-07-21 | 2010-01-28 | Fev Motorentechnik Gmbh | Shifting valve lever for valve drive, has valve shifting function and two partial levers flexibly connected around pivot pin, where shifting blocking unit is operated between partial levers, and return spring is provided as coil spring |
DE102011016384A1 (en) | 2011-04-07 | 2012-10-11 | Kurt Imren Yapici | Fully variable valve train |
DE102017009326A1 (en) | 2017-10-09 | 2019-04-11 | Kurt Imren Yapici | valve train |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19532334A1 (en) * | 1995-09-01 | 1997-03-06 | Bayerische Motoren Werke Ag | Variable valve train, especially for internal combustion engines |
DE19640520A1 (en) * | 1996-07-20 | 1998-04-09 | Dieter Dipl Ing Reitz | Valve train and cylinder head of an internal combustion engine |
US6019076A (en) * | 1998-08-05 | 2000-02-01 | General Motors Corporation | Variable valve timing mechanism |
DE19913742A1 (en) * | 1999-03-26 | 2000-09-28 | Bayerische Motoren Werke Ag | Device for stroke adjustment of a gas exchange valve in the cylinder head of an internal combustion engine |
DE10006018B4 (en) * | 2000-02-11 | 2009-09-17 | Schaeffler Kg | Variable valve drive for load control of a spark-ignited internal combustion engine |
DE10052811A1 (en) * | 2000-10-25 | 2002-05-08 | Ina Schaeffler Kg | Variable valve train for load control of a spark ignition internal combustion engine |
-
2002
- 2002-05-13 DE DE10221133A patent/DE10221133A1/en not_active Withdrawn
-
2003
- 2003-05-02 AU AU2003227706A patent/AU2003227706A1/en not_active Abandoned
- 2003-05-02 AT AT03725134T patent/ATE311526T1/en not_active IP Right Cessation
- 2003-05-02 WO PCT/EP2003/004627 patent/WO2003095805A1/en not_active Application Discontinuation
- 2003-05-02 DE DE50301810T patent/DE50301810D1/en not_active Expired - Lifetime
- 2003-05-02 EP EP03725134A patent/EP1506345B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO03095805A1 * |
Also Published As
Publication number | Publication date |
---|---|
ATE311526T1 (en) | 2005-12-15 |
DE50301810D1 (en) | 2006-01-05 |
AU2003227706A1 (en) | 2003-11-11 |
WO2003095805A1 (en) | 2003-11-20 |
EP1506345B1 (en) | 2005-11-30 |
DE10221133A1 (en) | 2003-11-27 |
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