EP1672183A1 - Culbuteur pour une distribution desmodromique - Google Patents

Culbuteur pour une distribution desmodromique Download PDF

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Publication number
EP1672183A1
EP1672183A1 EP04029575A EP04029575A EP1672183A1 EP 1672183 A1 EP1672183 A1 EP 1672183A1 EP 04029575 A EP04029575 A EP 04029575A EP 04029575 A EP04029575 A EP 04029575A EP 1672183 A1 EP1672183 A1 EP 1672183A1
Authority
EP
European Patent Office
Prior art keywords
valve
lever
pivot
cam
drive according
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Withdrawn
Application number
EP04029575A
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German (de)
English (en)
Inventor
Andreas Bongard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Joh Winklhofer Beteiligungs GmbH and Co KG
Original Assignee
Joh Winklhofer and Soehne GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Joh Winklhofer and Soehne GmbH and Co KG filed Critical Joh Winklhofer and Soehne GmbH and Co KG
Priority to EP04029575A priority Critical patent/EP1672183A1/fr
Publication of EP1672183A1 publication Critical patent/EP1672183A1/fr
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the present invention relates to a positively controlled valve train having a valve, a driven cam, a flexible, the cam closely entwined Umsch conductedungselement and a coupling device which connects the valve with the enclosing element.
  • valve trains for internal combustion engines usually have a return device or a spring element, by means of which the valve is closed and held in its closed position.
  • a valve actuator e.g. Valve tappet, drag lever or rocker arm, opens by the movement of the cam, the valve against the restoring force of the valve spring usually used.
  • the components of the valve, in particular the restoring device would have to be matched to each other and to the operating requirements.
  • valve trains also called desmodromic valve controls
  • valve spring which both limit the construction in terms of the required installation space, as well as the camshaft load, can be omitted.
  • desmodromic valve controls prevent possible lifting of the valve stem ends from the camshaft, which can lead to valve flutter.
  • valve positive controls with a relatively large footprint in the region of the respective cam and possibly relatively large moving mass
  • positively controlled valve trains with a cam surrounding the surrounding circumference element, which is connected directly or via a coupling element with the valve used
  • Such a positively driven valve train is already described in DE 37 00 715 A1, in which the enclosing element is designed as a flexible sliding band which is placed around the cam so that it can not rotate with the cam. On this sliding band directly the valve stem of the valve is movably mounted.
  • the surrounding the cam surrounding element is connected by means of a tether to the valve stem of the valve.
  • the tying device can additionally be designed with a clamping function for the enclosing element.
  • the cam is tightly wrapped by the enclosing without significant play and the movement of the cam is transmitted directly or via a coupling device on the valve, which opens and closes according to the movements of the cam.
  • the valve stem is usually provided with a corresponding screw thread.
  • the present invention is therefore an object of the invention to provide a positively controlled valve train of the type mentioned, in which the connection between the belt and the valve is formed improved.
  • the coupling device comprises a pivot lever which is pivotable about a pivot bearing, and the wrapper is connected to a spaced from the pivot bearing connection point with the pivot lever.
  • This connection of the cam substantially without play embracing encircling element to a pivot lever increases in particular the degrees of freedom in the design, as can be made by the pivot lever, the arrangement of the valves independent of the position of the camshaft.
  • the use of such a pivot lever allows both a translation and a change in the direction of movement of the oscillating force induced by the driven cam.
  • the pivot lever construction according to the invention allows by the variation of the gear ratios a favorable cam shape with respect to the radii and the circumference and thus also facilitates the construction of the enclosing element, in particular as a roller chain. As a result, small-sized and compact valve controls with lower masses are possible.
  • the movement transmitted to the valve both in the direction of compression and tension via the pivoting lever does not have to be solely due to the cam shape but can also be generated by the articulation on the lever.
  • levers In conventional valve trains loaded by a restoring force, levers are known as drag levers or rocker arms, which, however, transmit the force of the cam only in the pressure direction and are also not connected to the cams.
  • drag levers or rocker arms Also different development strands desmodromischer valve controls without enclosing elements, which wrap around the cam tight, have due to their development of conventional valve trains with rocker or rocker arms constructions with levers.
  • US 6,311,659 B1 shows the further development of a conventional valve control with a rocker arm, in which the return spring for closing the valve is replaced by a return mechanism cooperating with an additional return cam on the camshaft. Neither the camshaft itself nor the return mechanism is connected to the rocker arm.
  • DE 102 16 230 A1 describes a valve train with a valve crankshaft, which transmits the rotation of the valve crankshaft by means of a Ventilpleuels and a rocker arm to a valve.
  • This valve train completely dispenses with a camshaft and the control of the valves by the cams.
  • the valve springs can be configured with a lower clamping force than comparable valve springs in the case of traditional camshafts, the masses of the components involved in such a valve crank drive are considerable larger than conventional or modern desmodromic camshaft valve trains.
  • the coupling device comprises a connecting plate which connects the enclosing element with the pivot lever, wherein the connecting plate is connected to the enclosing element and at the connection point with the pivot lever.
  • the connecting tab provides a simple connection between the enclosing element and the pivoting lever. In this case, a movable attachment of the connecting plate at the connection point of the pivot lever allows a free pivoting movement of the pivot lever about the pivot bearing.
  • the coupling device comprises a lever roller, which is connected at the connection point with the pivot lever and is in contact with the enclosing element.
  • the connecting strap and the lever roller can be connected at the connection point by means of a bolt with the pivoting lever.
  • the bolt can simultaneously form the pivot bearing of the lever roller.
  • the bolt can be arranged against the spring force of a spring element, in particular a leaf spring, movable on the rocker arm.
  • a spring element in particular a leaf spring, movable on the rocker arm.
  • the bolt in the transmission of the force induced by the driven cam from the Umsch adoptedungselement on the pivot lever in the pulling direction, ie usually to close the valve again, the bolt can be supported against the spring force of a spring element on the pivot lever to the remaining game of the cam closely to compensate for the encircling encircling element.
  • this spring element causes a damped effect of the cam in the pulling direction and so in addition to a slightly delayed closing of the valve and a gentle, gentle material impact of the valve disk on the valve seat.
  • the bolt can protrude laterally beyond the pivoting lever and the connecting link can be connected to the bolt on the laterally projecting section.
  • the pivot lever may have a recess which is bounded by two lateral portions of the pivot lever and in which the lever roller is arranged.
  • the bolt can be guided in the lateral sections of the pivot lever.
  • a preferred embodiment provides that the lever roller is designed as a rolling bearing.
  • a rolling bearing allows rolling of the lever roller with only a lower load of the bolt used for connection to the pivot lever.
  • the pivoting lever may further comprise a connecting portion to the valve, wherein the connecting portion is formed with a displaceable pivot point to the valve to compensate for the circular pivotal movement of the pivot lever in relation to the linear movement of the valve. Due to the different forms of movement of the valve and the pivot lever shifts with each movement of the intersection of these two components to each other, which is why the rocker arm can be designed in a suitable manner as a backdrop. In a simple way, the necessary length compensation, or the displacement of the point of intersection can be realized by a slot arranged in the connecting region of the pivot lever by a pin fixed in the valve stem is guided.
  • a particular embodiment of the positively controlled valve train provides that the pivot bearing is supported against a support member and the position of the pivot bearing relative to the support element is adjustable.
  • a support element allows by adjusting the pivot bearing position a compensation of the valve, both in the compression and in the pulling direction, the support member is positively connected to the pivot bearing of the pivot lever. In this case, an adjustment of the position of the pivot bearing take place both mechanically and hydraulically.
  • the enclosing element may be formed as a roller chain.
  • a roller chain is a low-wear, reliable solution for the Umsch conductedungselement a positively controlled valve train.
  • the connecting strap can be attached to a hinge pin of the roller chain.
  • the roller chain can have lateral tabs, wherein the tabs protrude laterally beyond the cam and with respect to the guide track of the cam.
  • Such a roller chain allows axial guidance of the chain on the cam, wherein the cam between the laterally opposite tabs engages.
  • the enclosing element can in principle also be designed as a rolling bearing which allows a particularly good sliding behavior on the guide track of the cam.
  • the rollers of the rolling bearing can be guided axially by adjacent to the cam member, over the cam track projecting discs.
  • the here present positively controlled valve train with a pivotable about a pivot bearing pivot lever opens next to the described advantageous embodiments constructive possibilities in a simple way spring and / or damping elements to tune the opening and closing of the valve to integrate and so tune the valve train to the requirements of modern internal combustion engines in particular for minimizing vibrations, resonances and the effects of backlash of the wrap element, the pivoting lever and the valve.
  • an arrangement of such elements on the support element of the pivot bearing is particularly easy.
  • An arrangement in the region of the valve with appropriate design restrictions and operational loads can be avoided. As a result, a simple construction of the positively controlled valve drive is still possible.
  • Fig. 1 and Fig. 2 show a positively controlled valve train with a cam 1, a Umsch adoptedungselement 3, a connecting plate 3, a pivot lever 4 and a valve 5.
  • the cam 1 is mounted on a rotating camshaft (not shown) and is tightly wrapped by the rollers 6 of the enclosure member 2 without substantial play.
  • the rollers 6 are part of a link chain (not shown) and guided on the hinge pin 7 (not shown substantially) of the link chain.
  • the connecting plate 3 is attached to the hinge pin 7 of the lowermost, the pivot lever 4 next most important role 6, the coupling roller 6 'at its first end.
  • the second end of the connecting plate 3 is arranged by the connecting pin 8 on the pivot lever 4.
  • the connecting pin 8 serves as a bearing axis for the lever roller 9, which touches the coupling roller 6 'of the enclosing element 2 with its outer circumference.
  • the coupling roller 6' is mounted in a rolling bearing.
  • the pivot lever 4 is pivotable about the pivot bearing 10, which is supported against the support member 11 and is positively connected in the compression and tension direction by the adjustment member 12 with the support member 11.
  • the pivot lever 4 is adjustable by the adjusting member 12 in its position relative to the support member 11.
  • the connection region 13 to the valve 5 is arranged from valve stem 14 and valve disk 15.
  • the connecting region 13 consists of a slot 16 incorporated in the pivoting lever 16 in which the valve pin 17, which is fixed to the valve stem 14, is movably guided.
  • the shape of the pivot lever 4 is clearly visible.
  • the pivoting lever 4 in this case has substantially the same width as the coupling roller 6 'plus the thickness of lateral guide straps on the enclosing element 2. If the connecting strap 3 is formed integrally with the guide strap, ie the connecting strap 3 is connected to two adjacent rollers 6, rollers 6 and pivot lever 4 have the same width.
  • the bolt 8 extends at the connection point 18 through the entire pivoting lever 4 through and stands laterally over to allow the attachment of the connecting plate 3.
  • the lever roller 9 is arranged in the region of the connection point 18.
  • the recess 21 is delimited by two lateral sections of the pivot lever 4, through which the bolt 8 extends and on whose outer side facing away from the lever roller 9 connect the connection tabs 3 arranged on both sides of the pivot lever 4.
  • the pivot bearing 10 is formed as a bolt which extends through a bore through the pivot lever 4, wherein also here in the middle of a recess 22 is provided, in which this pivot pin is connected to the adjusting element 12.
  • the connection area 13 from the pivot lever 4 to the valve 5 has a recess 23 in which the valve stem 14 is arranged and in which the valve pin 17 engages in the slot 16.
  • Fig. 3 shows an enlarged view of the connection between the enclosing element 2 and the pivot lever 4 of connecting plate 3 and the lever roller 9.
  • the connecting plate 3 is fixed to the hinge pin 7, the pivot lever 4 nearest lying role 6 of the enclosing element 2, the coupling roller ', connected.
  • the coupling roller 6 ' is further rotatably mounted in the rolling bearing on the hinge pin 7, while the connecting plate 3 is not rotatably mounted on the hinge pin 7, but movably mounted relative to the enclosing element 2.
  • the second end of the connecting plate 3 is connected to the connecting pin 8 at the connection point 18 with the pivoting lever 4.
  • the joint 18 comprises a substantially circular receptacle 19 for the connecting bolt 8, which is open in the direction of the enclosing element 2, wherein the connecting pin 8 is held by a leaf spring 20 in the receptacle 19.
  • the cam 1 used to control the one valve 5 rotates about the center M of the camshaft.
  • the coupling roller 6 ' moves on a circular path about the center M, the position of the valve 5 does not change.
  • the coupling roller 6 ' moves away from the center M of the cam 1 and presses on the connecting tab 3 and the lever roller 9 on the lying in the receptacle 19 connecting pin 8.
  • the pivot lever 4 pivots about the pivot bearing 10 and presses it the valve 5 fastened in the connection area 13 downwards, whereby the valve plate 15 is released from the valve receptacle in the installed state.
  • the position of the connection point remains the same relative to the pivot bearing 10, the connection point 18 and the coupling point to the enclosing element 2, i. the coupling roller 6 '.
  • the cam 1 travels in its rotary motion until the coupling roller 6 'reaches the point furthest from the midpoint M on the cam track, at which point the valve reaches its maximum open position.
  • the pressure movement of the cam 1 on the coupling device of the connecting pin 8 is positively pressed in the receptacle 19.
  • the pivot lever 4 is moved by the connecting link 3 in the direction of the center M of the camshaft withdrawn, causing the valve closes slowly again.
  • the connecting bolt 8 is mounted resiliently in the receptacle 19 against the leaf spring 20 in order to compensate for the remaining play in the enclosing element 2.
  • the cam 1 continues to rotate with the camshaft until the coupling roller 6 'again reaches the circular portion of the cam track about the center M of the camshaft, at which the valve is retracted to its closed position.
  • the pivot lever 4 is supported with its pivot bearing 10 on the support member 11 from that is adjustable by the adjusting member 12 in its position to the support element.
  • the support member 11 may also be formed as an expansion element that changes the position of the pivot bearing, for example, depending on the temperature, or the change in temperature.
  • the pivot lever 4 for a positively controlled valve drive according to the invention is designed as a backdrop to compensate for the length compensation in the circular section-shaped movement of the pivot lever 4 about the pivot bearing 10 for linear movement of the valve 5.
  • the valve pin 17 is guided in the slot 16 of the pivot lever 4, whereby the valve is positively connected in the compression and tension direction with the pivot lever 4.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP04029575A 2004-12-14 2004-12-14 Culbuteur pour une distribution desmodromique Withdrawn EP1672183A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04029575A EP1672183A1 (fr) 2004-12-14 2004-12-14 Culbuteur pour une distribution desmodromique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04029575A EP1672183A1 (fr) 2004-12-14 2004-12-14 Culbuteur pour une distribution desmodromique

Publications (1)

Publication Number Publication Date
EP1672183A1 true EP1672183A1 (fr) 2006-06-21

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EP04029575A Withdrawn EP1672183A1 (fr) 2004-12-14 2004-12-14 Culbuteur pour une distribution desmodromique

Country Status (1)

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EP (1) EP1672183A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103670569A (zh) * 2013-12-20 2014-03-26 贾开继 发动机连续可变气门正时、相位及升程技术

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832327A (en) * 1956-11-13 1958-04-29 Lorenz Harald Mechanically operated springless circular eccentric valve gear
WO2001012958A1 (fr) * 1999-08-12 2001-02-22 Stefan Battlogg Commande de soupape, en particulier pour moteurs a combustion interne de vehicules
EP1205643A1 (fr) * 2000-11-13 2002-05-15 Stefan Battlogg Dispositif d'actionnement de soupapes de moteur à combustion interne
WO2003040525A1 (fr) * 2001-10-17 2003-05-15 Geoffrey Oswald Nevin Mecanisme d'entrainement de soupape a cames a rainures pour moteurs a combustion interne
WO2003083269A1 (fr) * 2002-03-28 2003-10-09 Stefan Battlogg Dispositif pour transformer un mouvement rotatoire en un mouvement de va-et-vient
DE10306428A1 (de) * 2003-02-15 2004-08-26 Contitech Antriebssysteme Gmbh Zwangsgesteuerter Ventiltrieb mit endlosem Koppelelement

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2832327A (en) * 1956-11-13 1958-04-29 Lorenz Harald Mechanically operated springless circular eccentric valve gear
WO2001012958A1 (fr) * 1999-08-12 2001-02-22 Stefan Battlogg Commande de soupape, en particulier pour moteurs a combustion interne de vehicules
EP1205643A1 (fr) * 2000-11-13 2002-05-15 Stefan Battlogg Dispositif d'actionnement de soupapes de moteur à combustion interne
WO2003040525A1 (fr) * 2001-10-17 2003-05-15 Geoffrey Oswald Nevin Mecanisme d'entrainement de soupape a cames a rainures pour moteurs a combustion interne
WO2003083269A1 (fr) * 2002-03-28 2003-10-09 Stefan Battlogg Dispositif pour transformer un mouvement rotatoire en un mouvement de va-et-vient
DE10306428A1 (de) * 2003-02-15 2004-08-26 Contitech Antriebssysteme Gmbh Zwangsgesteuerter Ventiltrieb mit endlosem Koppelelement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103670569A (zh) * 2013-12-20 2014-03-26 贾开继 发动机连续可变气门正时、相位及升程技术

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