EP1600610A2 - Ventiltrieb für eine Brennkraftmaschine - Google Patents
Ventiltrieb für eine Brennkraftmaschine Download PDFInfo
- Publication number
- EP1600610A2 EP1600610A2 EP05004872A EP05004872A EP1600610A2 EP 1600610 A2 EP1600610 A2 EP 1600610A2 EP 05004872 A EP05004872 A EP 05004872A EP 05004872 A EP05004872 A EP 05004872A EP 1600610 A2 EP1600610 A2 EP 1600610A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- chain
- cam
- valve
- recess
- valve gear
- 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
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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
- F01L1/30—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of positively opened and closed valves, i.e. desmodromic 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
- F01L1/02—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
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/20—Shapes or constructions of valve members, not provided for in preceding subgroups of this group
Definitions
- the invention is based on a valve drive for an internal combustion engine, according to the preamble of claim 1.
- a generic valve train is disclosed in WO 03/083269 A1. He includes a rotationally driven cam, around which a belt-shaped looping element is laid. On the chain, a gas exchange valve is pivotally articulated. The necklace is out composed of a plurality of stringed chain links, the chain through a spring element is tensioned to play between the chain and the Compensate cam peripheral surface.
- the one stroke contour defining Cam peripheral surface is composed of a base circle section, a Eccentric section and flanks between the base circle section and the Eccentric section are formed.
- the object of the invention is to optimize a valve train of the type mentioned.
- valve train 1 for a not shown here Internal combustion engine. It comprises a rotatable cam 2, one around the cam 2 around laid, with respect to the cam 2 fixed, but by the cam. 2 deflectable belt element 3 and one on the belt 3 fixed gas exchange valve 4 with a valve stem 5 and a valve disc 6, which Valve plate 6 cooperates with a valve seat 7.
- the valve train 1 is in the Fig. - For the sake of simplicity, shown in two embodiments, which will be described below will be received.
- the cam 2 is in particular rotationally fixed on a rotary drivable camshaft 8 attached. It comprises a base circle section 9, an eccentric section 10 as well flanks 11 and 12 lying between base circle section 9 and eccentric section 10, of which - due to a predetermined direction of rotation 13 of the cam 2 - the flank eleventh as the opening edge 11 and the edge 12 is defined as the closing edge 12.
- Base circle section 9, eccentric section 10 and flanks 11 and 12 form one Cam peripheral surface 14 with a stroke contour, the lifting movement of the Gas exchange valve 4 controls. Through this stroke contour is at a rotation of the Cam 2, the gas exchange valve 4 in a closed position, not shown in the Valve seat 7 are as long as the base circle section 9 on the following only As a valve 4 designated gas exchange valve acts.
- the circumferentially executed and closed belt element 3 can in Circumferential direction UR substantially inextricably and from several juxtaposed Chain links 15 be composed in articulation axes 16 hinged together are connected, so that the belt 3 to the stroke contour of Cam peripheral surface 14 can create as much as possible.
- the hinge axes 16 extend So parallel to the axial extent of the camshaft 8.
- To the hinge axes 16 can fixed sleeves or - as preferably provided - rotatable rollers 17th be arranged, which are supported on the cam peripheral surface 14.
- the Umschlingungselement 3 is thus as a chain 18, in particular roller chain or Sleeve chain, executed.
- the valve 4 is pivotally connected to the belt 3 in an articulation 19 connected to a pivot axis 20, wherein the pivot axis 20th - As the hinge axes 16 - parallel to the camshaft 8, so that the valve 4 in Double arrow 21 is pivotally hinged.
- the tapping element 22 follows the Cam peripheral surface 14, when the cam 2 rotates, and the tap element 22nd transmits the resulting stroke to the valve 4, which on the above described movement in the opening direction OR or closing direction SR performs.
- the circumferential length of the belt element 3 measured in the circumferential direction UR is slightly larger than the circumference measured in the same circumferential direction UR Cam 2 on the cam peripheral surface 14, so that between the cam peripheral surface 14th and wrapping element 3 a slight clearance (not shown) is present.
- This game results in particular from the known polygon effect of a chain, in which the individual chain links 15 form a polygon whose corners in the joint axes 16 can lie.
- the circumferential length (seen in the circumferential direction UR) of the chain 18 is so dimensioned that the cam 2 any rotational position DT within the chain 18th can take.
- the cam peripheral surface 14th at least one elevation 24 and / or at least one recess 25 to be arranged.
- the cam 2 in a first embodiment either with the at least one recess 25 or in a second embodiment with the equipped at least one survey 24.
- a valve train 1 a cam 2 both with at least one elevation 24th and equip at least one recess 25.
- the Cam peripheral surface 14 In the area of the recess 25 is the Cam peripheral surface 14 recessed with a trough in the direction of the camshaft 8, so that the recess 25 with respect to the adjoining cam peripheral surface 14 has a depth TF.
- the at least one recess 25, however, is preferably in Placed area of the base circle section 9, since the valve 4 anyway in his Closed position in the valve seat 7 is located.
- Cam 2 may be provided with at least one recess 25, a circumferential direction UR acting spring element 26 between two chain links 15 and / or in opening or closing direction SR acting spring element 27 in the region of the articulation 19th to arrange between chain 18 and valve 4.
- the survey 24 - seen in the circumferential direction UR - with Distance to the first transition region 23 between edge 11 and 12 and the Eccentric section 10 is located.
- the recess 25 is - seen in the circumferential direction UR - with Distance to a second transition region 28, the flank between 11 and 12 and the base circle section 9 is located. This distance will depend on the division of the Chain 18 selected, that is, depending on the number of chain links 18 distributed to the Cam peripheral surface 14, so that exactly then a roller 17 in the recess 25 runs or a roller 17 is located on the survey 24 when another roller 17 in the first Transition region 23 is located on the cam peripheral surface 14 or if the first Transition region 23 between two rollers 17 is.
- the distance of the recess 25th or elevation 24 to this transition region 23 should therefore be the length LA of a Chain link 15 and a multiple of this length LA amount.
- the height HO of the survey 24 is selected to be correspondingly larger when the number of Chain links 15 is less, as with a chain 18 with greater pitch of the Polygon effect correspondingly clearer and thus a bigger game between Chain 18 and cam peripheral surface 14 should be present. Accordingly, vice versa the height HO of the survey 24 is chosen to be smaller when a chain 18 with lesser Division, that is used with a larger number of chain links 15.
- the depth TF of the recess 24 is selected correspondingly larger, if the number of Chain links 15 is less, as with a chain 18 with greater pitch of the Polygon effect correspondingly larger and thus a bigger game between chain 18 and Cam peripheral surface 14 is likely to be present.
- the depth TF is the Recess 24 chosen lower, if a chain 18 with a lower pitch, ie with a larger number of chain links 15 is used.
- the height HO of the survey 24 or the depth TF of the recess 25 may, moreover, to the stroke contour of the cam. 2 be adapted, since the configuration of the stroke contour, especially in the first Transition region 23, which can affect the polygon effect.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
Description
Claims (10)
- Ventiltrieb für eine Brennkraftmaschine, mit einem drehbaren Nocken, welcher Nocken eine Nockenumfangsfläche, einen Grundkreisabschnitt, einen Exzenterabschnitt und seitliche, den Grundkreisabschnitt mit den Exzenterabschnitt verbindende Flanken aufweist, mit einem um den Nocken angeordneten, als Kette ausgeführten Umschlingungselement, welche Kette mehrere aneinander gereihte Kettenglieder aufweist, und mit einem Gaswechselventil, das an dem Umschlingungselement angelenkt ist, dadurch gekennzeichnet, dass die Nockenumfangsfläche (14) im Grundkreisabschnitt (9) und/oder im Exzenterabschnitt (10) zumindest eine Erhebung (24) und/oder eine Vertiefung (25) aufweist.
- Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass die Erhebung (24) und/oder die Vertiefung (25) - in Umfangsrichtung (UR) des Nockens (2) gesehen - mit einem Abstand zu einem ersten Übergangsbereich (23) zwischen dem Exzenterabschnitt (10) und einer der Flanken (11, 12) und/oder mit einem Abstand zu einem zweiten Übergangsbereich (28) zwischen Grundkreisabschnitt (9) und einer der Flanken (11,12) angeordnet ist.
- Ventiltrieb nach Anspruch 1 und 2, dadurch gekennzeichnet, dass der Abstand in Abhängigkeit der Teilung der Kette (18) gewählt ist.
- Ventiltrieb nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der Abstand einer Länge (LA) eines Kettengliedes (15) entspricht oder ein Vielfaches dieser Länge (LA) beträgt.
- Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass die Erhebung (24) im Exzenterabschnitt (10) angeordnet ist.
- Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass die Vertiefung (25) im Grundkreisabschnitt (9) angeordnet ist.
- Ventiltrieb nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Kette (18) eine Rollen - oder Hülsenkette ist.
- Ventiltrieb nach Anspruch 1, dadurch gekennzeichnet, dass die Höhe (HO) der Erhebung (24) bzw. die Tiefe (TF) der Vertiefung (25) in Abhängigkeit der Anzahl der Kettenglieder (15) gewählt wird.
- Ventiltrieb nach Anspruch 1, 3 oder 7, dadurch gekennzeichnet, dass die Kette (18) ein in Umfangsrichtung (UR) wirkendes Federelement (27) aufweist.
- Ventiltrieb nach Anspruch 1, 3 oder 7, dadurch gekennzeichnet, dass zwischen Kette (18) und Gaswechselventil (4) ein Federelement (27) angeordnet ist.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200410026430 DE102004026430B3 (de) | 2004-05-29 | 2004-05-29 | Ventiltrieb für eine Brennkraftmaschine |
| DE102004026430 | 2004-05-29 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1600610A2 true EP1600610A2 (de) | 2005-11-30 |
| EP1600610A3 EP1600610A3 (de) | 2008-08-20 |
| EP1600610B1 EP1600610B1 (de) | 2010-06-30 |
Family
ID=34813747
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20050004872 Expired - Lifetime EP1600610B1 (de) | 2004-05-29 | 2005-03-05 | Ventiltrieb für eine Brennkraftmaschine |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP1600610B1 (de) |
| DE (2) | DE102004026430B3 (de) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003083269A1 (de) | 2002-03-28 | 2003-10-09 | Stefan Battlogg | Vorrichtung zur umwandlung einer drehbewegung in eine hin- und hergehende bewegung |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB434247A (en) * | 1934-10-20 | 1935-08-28 | John Fareso Senior | Valve operating mechanism |
| JPH03168307A (ja) * | 1989-11-24 | 1991-07-22 | Takuya Matsumoto | エンジンのバルブ駆動装置 |
| DE4215057A1 (de) * | 1992-05-07 | 1993-11-11 | Audi Ag | Nockenwelle |
| EP1205643A1 (de) * | 2000-11-13 | 2002-05-15 | Stefan Battlogg | Ventieltrieb für eine Verbrennungskraftmaschine |
| EP1245797A3 (de) * | 2001-03-26 | 2003-01-08 | Stefan Battlogg | Desmodromischer Ventiltrieb |
| DE50201648D1 (de) * | 2001-05-04 | 2005-01-05 | Stefan Battlogg | Vorrichtung zur Umwandlung einer Drehbewegung in eine hin- und hergehende Bewegung |
-
2004
- 2004-05-29 DE DE200410026430 patent/DE102004026430B3/de not_active Expired - Fee Related
-
2005
- 2005-03-05 DE DE200550009812 patent/DE502005009812D1/de not_active Expired - Lifetime
- 2005-03-05 EP EP20050004872 patent/EP1600610B1/de not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003083269A1 (de) | 2002-03-28 | 2003-10-09 | Stefan Battlogg | Vorrichtung zur umwandlung einer drehbewegung in eine hin- und hergehende bewegung |
Also Published As
| Publication number | Publication date |
|---|---|
| DE502005009812D1 (de) | 2010-08-12 |
| DE102004026430B3 (de) | 2005-09-01 |
| EP1600610B1 (de) | 2010-06-30 |
| EP1600610A3 (de) | 2008-08-20 |
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