EP1680577A1 - Valve train of an internal combustion engine comprising at least one camshaft - Google Patents
Valve train of an internal combustion engine comprising at least one camshaftInfo
- Publication number
- EP1680577A1 EP1680577A1 EP04790533A EP04790533A EP1680577A1 EP 1680577 A1 EP1680577 A1 EP 1680577A1 EP 04790533 A EP04790533 A EP 04790533A EP 04790533 A EP04790533 A EP 04790533A EP 1680577 A1 EP1680577 A1 EP 1680577A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cam
- piece
- valve train
- stroke
- tracks
- 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 16
- 238000006073 displacement reaction Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000000034 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
-
- 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
- F01L1/08—Shape of cams
-
- 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
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
- F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the valves
-
- 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
- F01L1/34413—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 using composite camshafts, e.g. with cams being able to move relative to the camshaft
-
- 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
- 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 the valve train of an internal combustion engine with at least one camshaft according to the preamble of claim 1.
- mechanical devices which influence the working cycle of the valve train and enable, for example, a speed-dependent change in the opening times or the stroke of the gas exchange valves.
- Such a device is known from the publication DE 42 30 877, in which a cam piece is arranged in a rotationally fixed and axially displaceable manner on a basic camshaft.
- the cam piece consists of a tubular support on which at least one cam is arranged, in which several different cam tracks emerge axially offset from a common base circle. Due to the axial displacement of the cam piece on the basic camshaft, a gas exchange valve is actuated by the differently shaped cam raceways, the cam raceways being able to differ in the stroke contour and / or in the phase position.
- An advantageous device for the axial displacement of a cam piece is known from the document EP 0 798 451, according to which a worm drive is formed on both sides of the cam piece, which has a cam track as a recess, in which an actuator can engage for the axial displacement of the cam piece.
- Cams are arranged, the two cams each having two cam tracks.
- the invention has for its object to provide a cam drive valve assembly of an internal combustion engine according to the preamble of claim, in which the cam member is further developed so that further functions can be represented by the valve train. This object is achieved by the features in the characterizing part of claim 1, according to which the first cam and the at least second cam of a cam piece differ from one another in at least one cam track.
- the filling of a combustion chamber can be significantly influenced. For example, a tumble flow can be created.
- the cam tracks of the first cam and the at least second cam of a cam piece differ from one another in the stroke contour and / or in the phase position.
- the stroke contour of a cam determines the start of the opening of the gas exchange valve, the course of the opening of the gas exchange valve, the maximum lift height of the gas exchange valve, the course of the closing of the gas exchange valve and the closing of the gas exchange valve.
- the phase position determines the camshaft rotation angle at which the maximum stroke height of the stroke contour is positioned. For a given stroke contour, the camshaft rotation angles at which the gas exchange valve opens and closes are also defined.
- the cam raceways of a cam can differ so far that the maximum stroke of the stroke contour of one cam raceway is formed outside the stroke contour of the other cam raceway of the cam.
- the gas exchange processes in the combustion chambers of the cylinders can be influenced in many ways by the valve train of an internal combustion engine according to the invention, in which the cams of a cam piece have different cam tracks.
- valve train according to the invention of an internal combustion engine is illustrated and explained below using an exemplary embodiment in conjunction with two figures.
- FIG. 1 shows a cam piece having two cams, each with two cam tracks
- Figure 2 shows the four different cam contours of the two cams of the cam piece.
- a six-cylinder internal combustion engine with two overhead camshafts for driving a motor vehicle is equipped with a device for adjusting the stroke and the opening times of the intake-side gas exchange valves.
- the device consists of six cam packs, which are arranged in a rotationally fixed and axially displaceable manner on the camshaft which actuates the gas exchange valves on the inlet side.
- Each cam package is assigned to exactly one cylinder, with each cylinder of the internal combustion engine having two gas exchange valves on the inlet side.
- two cams are formed on the cam piece, each cam actuating an inlet-side gas exchange valve.
- a worm gear is formed on both sides of the cam pieces, in which a cam track is formed as a depression.
- the cam tracks of the two worm drives of a cam piece are mirror images of each other, which causes the cam piece to move axially in both directions.
- the cam pieces are axially displaced by actuators arranged radially to the camshaft, which are designed as electromagnetic valves and each consist of an actuating pin and two electromagnets.
- the actuators are firmly connected to the cylinder head of the internal combustion engine.
- the actuating pin can be extended and retracted by the electromagnets.
- the actuating pin engages in the recess of a worm drive forming the cam track, the cam piece being axially displaced by the rotation of the camshaft during operation of the internal combustion engine. That enables the torsional strength with simultaneous axial displaceability
- Connection between the camshaft and the cam piece consists of a toothing which is formed on the camshaft as an external toothing and in the cam piece as an internal toothing.
- the toothing is designed as a plurality of teeth.
- the two cams of a cam piece each have two cam tracks, a cam track for a small lifting height of the gas exchange valve and a cam track for a large lifting height of the gas exchange valve.
- the cam track with the small stroke height is switched at engine speeds below 2500 revolutions per minute
- the cam track with the large stroke height is switched at engine speeds above 2500 revolutions per minute.
- FIG. 1 shows a representation of the cam piece 1 having a first cam 4 and a second cam 5, both cams 4, 5 each having two cam tracks 4.1, 4.2, 5.1, 5.2.
- a worm drive 2, 3 is formed on each of the two end faces of the cam piece 1.
- the worm drives 2, 3 each have a cam track 2.1, 3.1, in which the actuators engage to move the cam piece 1.
- the two cam tracks 4.1, 5.1, which have the small lifting height, and also the two cam tracks 4.2, 5.2, which have the large lifting height, are not completely worked out in the same way.
- FIG. 2 shows the four different stroke contours of the two cams 4, 5 of the cam piece, each having two cam tracks 4.1, 4.2, 5.1, 5.2 1.
- the two cam tracks 4.1 having the small cam lift
- the cam track 5.1 has a stroke contour through which the gas exchange valve is opened at an earlier camshaft rotation angle.
- the maximum cam stroke of the cam track 5.1 is slightly higher than the cam stroke of the cam track 4.1.
- the closing of the gas exchange valve takes place slightly earlier in the cam track 5.1 than in the cam track 4.1.
- the cam track 5.2 has a stroke contour through which the gas exchange valve is opened at an earlier camshaft rotation angle.
- the maximum cam stroke of the cam track 4.2 is slightly smaller than the cam stroke of the cam track 5.2.
- the closing of the gas exchange valve takes place slightly earlier in the cam track 4.2 than in the cam track 5.2.
- the cam tracks of one cam can be designed so differently that the maximum stroke of the stroke contour of one cam track is formed outside the stroke contour of the other cam track.
- the thermodynamic advantages of the axially displaceable cam pieces can be further optimized by the valve train according to the invention of the internal combustion engine with four cam pieces having different cam tracks. LIST OF REFERENCE NUMBERS
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)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2003149898 DE10349898A1 (en) | 2003-10-25 | 2003-10-25 | Valve gear of an internal combustion engine with at least one camshaft |
PCT/EP2004/011697 WO2005040562A1 (en) | 2003-10-25 | 2004-10-16 | Valve train of an internal combustion engine comprising at least one camshaft |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1680577A1 true EP1680577A1 (en) | 2006-07-19 |
EP1680577B1 EP1680577B1 (en) | 2016-10-05 |
Family
ID=34485063
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04790533.6A Active EP1680577B1 (en) | 2003-10-25 | 2004-10-16 | Valve train of an internal combustion engine comprising at least one camshaft |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1680577B1 (en) |
DE (1) | DE10349898A1 (en) |
WO (1) | WO2005040562A1 (en) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102005033018A1 (en) * | 2005-07-15 | 2007-01-25 | Schaeffler Kg | Valve train for an internal combustion engine |
DE102008033230B4 (en) | 2008-01-04 | 2010-05-27 | Hydraulik-Ring Gmbh | Double camshaft adjuster in layer construction |
US7841311B2 (en) | 2008-01-04 | 2010-11-30 | Hilite International Inc. | Variable valve timing device |
DE102008023098A1 (en) | 2008-05-09 | 2009-12-17 | Hydraulik-Ring Gmbh | Valve operating mechanism for internal combustion engine, has camshaft and swiveling camshaft for changing relative position of camshaft adjuster to shaft |
DE102010020035A1 (en) | 2010-05-11 | 2011-11-17 | Volkswagen Ag | Valve train for combustion engine, has selector gates exhibiting larger diameter in predetermined portion than outer diameter of cam piece such that cam piece is plunged into selector gates during axial displacement of another cam piece |
DE102010033296A1 (en) | 2010-08-04 | 2012-02-09 | Hydraulik-Ring Gmbh | Camshaft adjuster, especially with camshaft |
DE102012010868A1 (en) | 2012-05-31 | 2013-12-05 | Avl Deutschland Gmbh | Method and device for monitoring an actuator device |
DE102012012064A1 (en) | 2012-06-15 | 2013-12-19 | Avl Deutschland Gmbh | Führungsnutanordnung on a shaft and method for axially displacing a shaft with a guide groove arrangement |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE463654A (en) | ||||
US1556410A (en) * | 1923-12-12 | 1925-10-06 | James L Boyer | Valve-operating mechanism for internal-combustion engines |
JPS62712U (en) * | 1985-06-19 | 1987-01-06 | ||
DE4230877A1 (en) | 1991-09-30 | 1993-04-01 | Volkswagen Ag | Control for lift valve with two cams - comprises cam block containing two cams which is axially displaceable but non rotatable peripherally on camshaft |
DE19519048A1 (en) * | 1995-05-24 | 1996-11-28 | Hermann Prof Dr Ing Krueger | Lift valve drive for internal combustion engines |
DE19625779A1 (en) * | 1995-07-08 | 1997-01-09 | Volkswagen Ag | IC engine valve lift characteristic affecting mechanism - has at least one cam held on camshaft with limited swivel |
DE19611641C1 (en) | 1996-03-25 | 1997-06-05 | Porsche Ag | Valve operating cam drive for combustion engines |
DE10054623A1 (en) * | 2000-11-03 | 2002-05-08 | Audi Ag | Device for changeover of cam pack on camshaft to operate gas exchange valves has actuating element in form of pin movable radially outwards and in extended state interacting with slide tracks in guide section |
DE10148179B4 (en) * | 2001-09-28 | 2015-09-24 | Schaeffler Technologies AG & Co. KG | Valve train with valve lift switching for the gas exchange valves of a 4-stroke internal combustion engine |
DE10148243A1 (en) * | 2001-09-28 | 2003-04-10 | Ina Schaeffler Kg | Valve drive with valve lift changing for the gas shuttle valve of a four-stroke internal combustion engine comprises a toothed shaft with an external tooth arrangement |
-
2003
- 2003-10-25 DE DE2003149898 patent/DE10349898A1/en not_active Withdrawn
-
2004
- 2004-10-16 WO PCT/EP2004/011697 patent/WO2005040562A1/en active Application Filing
- 2004-10-16 EP EP04790533.6A patent/EP1680577B1/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2005040562A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE10349898A1 (en) | 2005-05-25 |
EP1680577B1 (en) | 2016-10-05 |
WO2005040562A1 (en) | 2005-05-06 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE102005003079B4 (en) | Internal combustion engine with a valve train | |
DE102014111411B4 (en) | CAMSHAFT ASSEMBLY | |
DE102014114951B4 (en) | engine assembly | |
DE19815112B4 (en) | Arrangement for variable valve timing and valve actuation | |
DE102010023571B4 (en) | Built camshaft | |
DE102004021376A1 (en) | Valve train for internal combustion engine, has sliding surface forming radial bearing and formed in bearing block, and radially rotating nut connected with lubricant e.g. oil, supply of internal combustion engine | |
DE10228022A1 (en) | Valve lifting device for the stroke adjustment of the gas exchange valves of an internal combustion engine | |
DE102004002290B4 (en) | Valve gear of an internal combustion engine | |
DE102004022849A1 (en) | Valve drive for combustion engines comprises a camshaft on which a cam support is fixed | |
DE102004056290B4 (en) | Valve gear of an internal combustion engine with at least one base camshaft | |
EP2500533B1 (en) | Combustion engine with mixed cam shaft | |
EP2742215B1 (en) | Cam element for a valve-gear device | |
EP1680577B1 (en) | Valve train of an internal combustion engine comprising at least one camshaft | |
DE102004021375B4 (en) | Valve gear of an internal combustion engine with at least one camshaft | |
WO2013004349A1 (en) | Internal combustion engine | |
DE3119133A1 (en) | Valve control device for four-stroke internal combustion engines | |
DE102011116117A1 (en) | Valve train device for an internal combustion engine | |
EP1608851B1 (en) | Device for the variable actuation of the gas exchange valves of internal combustion engines, and method for operating one such device | |
DE102015205297A1 (en) | Internal combustion engine | |
DE4413406C2 (en) | Internal combustion engine with variable valve timing | |
EP2807360A1 (en) | Internal combustion engine valve train device | |
DE10349902A1 (en) | Valve drive for an I.C. engine comprises a camshaft with a cam piece with cams having running surfaces | |
DE102015219875B4 (en) | Control shaft for intake valve deactivation | |
DE102004058622A1 (en) | Improved design camshaft especially for IC engine with the different cam profiles separated by a spacer profile to prevent damage to cam edges during grinding | |
EP3564502B1 (en) | Variable valve drive |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20060526 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT |
|
DAX | Request for extension of the european patent (deleted) | ||
RBV | Designated contracting states (corrected) |
Designated state(s): DE FR GB IT |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: DENGLER, STEFAN |
|
17Q | First examination report despatched |
Effective date: 20080131 |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
INTG | Intention to grant announced |
Effective date: 20160712 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): DE FR GB IT |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D Free format text: NOT ENGLISH |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 13 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 502004015332 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 502004015332 Country of ref document: DE |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20170706 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 14 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: PLFP Year of fee payment: 15 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R084 Ref document number: 502004015332 Country of ref document: DE |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230529 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20231023 Year of fee payment: 20 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: IT Payment date: 20231030 Year of fee payment: 20 Ref country code: FR Payment date: 20231024 Year of fee payment: 20 Ref country code: DE Payment date: 20231031 Year of fee payment: 20 |