EP1490584B1 - Dispositif pour commander de maniere variable les soupapes de changement des gaz d'un moteur a combustion interne - Google Patents

Dispositif pour commander de maniere variable les soupapes de changement des gaz d'un moteur a combustion interne Download PDF

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Publication number
EP1490584B1
EP1490584B1 EP02747200A EP02747200A EP1490584B1 EP 1490584 B1 EP1490584 B1 EP 1490584B1 EP 02747200 A EP02747200 A EP 02747200A EP 02747200 A EP02747200 A EP 02747200A EP 1490584 B1 EP1490584 B1 EP 1490584B1
Authority
EP
European Patent Office
Prior art keywords
cam
piston
vertex
pressure
stepped bore
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.)
Expired - Lifetime
Application number
EP02747200A
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German (de)
English (en)
Other versions
EP1490584A2 (fr
Inventor
Thomas Sebastian
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1490584A2 publication Critical patent/EP1490584A2/fr
Application granted granted Critical
Publication of EP1490584B1 publication Critical patent/EP1490584B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01L1/02—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
    • 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
    • F01L13/0057—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 splittable or deformable cams

Definitions

  • the invention relates to a device for variably controlling the gas exchange valves of an internal combustion engine, of which at least one gas exchange valve is driven by a cam of a camshaft, which has a cam contour with a cam base circle portion and a cam tip portion, according to the preamble of claim 1.
  • the prior art discloses various approaches for implementing a variable gas exchange valve control.
  • valve control devices are known in which the valve strokes are variable in stages.
  • a valve control device is for example in the EP 0 515 520 B1 described, which has a plunger of two concentric cup elements, of which the inner rests with its one end face on the valve stem of the gas exchange valve.
  • Tappet cooperates with the cam of a camshaft having three sub-cams with different cam tracks.
  • the two outer cam tracks have the same stroke course and act on the outer cup member.
  • the middle part cam has a deviating stroke curve with a lower lifting height and acts on the inner cup element.
  • the two concentric cup elements can be coupled together by hydraulic loading of a coupling element or moved independently in a second switching position of this coupling element.
  • the two cup elements are connected to each other so that they follow the stroke of the part cam with a larger stroke.
  • this movement is transmitted to the valve stem.
  • the two cup elements are independently movable.
  • the valve stem cooperates in this switching position with the middle part cam with a lower stroke.
  • the outer cup member follows the lifting movement of the outer part cam, but with no connection to the inner cup member or the valve stem.
  • the camshaft of DE 37 05 128 A1 has slidably mounted scenes on which can be moved by means of a spool more or less far out of the camshaft. Also from the US 5 505 168 and the WO 95/23912 It is known to adjust a cam mounted on the cam by means of an axially displaceable, integrated in the camshaft spool.
  • the piston can be moved out of or into the associated cam.
  • the cam contour of the cams is continuously variable, so that any lifting curves of the gas exchange valves can be achieved.
  • the lifting height, the valve opening time and speed are infinitely variably adjustable. Since the retractable and retractable piston slidably mounted in the otherwise unchanged cam and the plunger anyway no changes are necessary, conventional valve trains with minor modifications to be converted. In addition, no additional space for the piston is necessary because of the integration in the cam, resulting in a very small footprint results. Since the camshaft is fully retained as a control element, the functionality of the valve control is guaranteed even if the pressure medium supply fails. Overall, with the invention over the prior art, an extremely cost-effective valve train can be realized.
  • the nockengipfel workede end of the piston is formed crowned. Then the cam top can roll in each angular position on the associated plunger friction.
  • the piston in case of failure of the pressure medium supply, the piston is held in a defined position.
  • the internal combustion engine can continue to be operated with predetermined control times and valve strokes without the possibility of damaging operating conditions.
  • a ball which can be unrolled on a rolling surface of a tappet cooperating with the relevant cam is rotatably mounted on the cam tip end of the piston.
  • friction losses and wear between plunger and cam are significantly reduced.
  • For storage of the ball is at the nockengipfel documenten end of the piston preferably a-the radius of the ball corresponding spherical bearing surface .ausge, whose edge is crimped radially to the inside for grasping the ball.
  • the bearing surface of the ball is thereby advantageously by the already existing Lubricating oil system of the internal combustion engine supplied with lubricating oil, so that between the ball and bearing surface with respect to friction and wear favorable hydrodynamic lubricating film can form.
  • the piston is actuated by lubricating oil of the internal combustion engine. Since in an internal combustion engine already under pressure lubricating oil is present, can be dispensed with an additional hydraulic pressure medium supply for the piston actuation.
  • the piston is guided linearly by the cam. Its radial position influencing the valve lift and the timing of the associated gas exchange valve is preferably adjustable depending on the equilibrium of forces between the piston radially inwardly urging spring forces and radially outwardly urging pressure forces of the lubricating oil.
  • a continuous stepped bore extending in the direction of the cam center axis is provided, wherein a helical spring is supported, on the one hand, on a cam-top-side step of the stepped bore and, on the other hand, on an annular face of the piston pointing away from a bottom-side piston acting face.
  • a pressure chamber for the lubricating oil is formed between the active surface of the piston and a closure piece inserted into the end of the stepped bore pointing away from the cam tip section, which is in communication with a lubricating oil channel coaxial with the camshaft axis.
  • the piston has a connecting the bearing surface with the pressure chamber channel.
  • the closure piece is supported by a sleeve inserted into the stepped bore, which serves as a radially inner stop for the piston when the internal combustion engine is at rest or when the pressure medium supply fails. Then, the coil spring urges the piston against the sleeve, so that the piston is held in a defined position.
  • the pressure build-up or the pressure reduction in the pressure chambers of the cams provided with retractable and extendable pistons preferably takes place by means of a valve arrangement, each of which contains a switching valve upstream of the lubricating oil passage of the camshaft and one downstream of the lubricating oil passage of the camshaft.
  • FIGURE shows a duo sectional view of a cam as part of a preferred embodiment of a device according to the invention for the variable control of the gas exchange valves of an internal combustion engine.
  • cam contour of such a cam 1 includes a Nockengrund Vietnameseabites 4 with Nockengrund Vietnamese Radius R and a thereto eccentric cam tip section 6.
  • rotational position of the cam 1 is the cam tip portion 6 with a rolling surface 8 of a tappet 10 in contact, which transmits the rotational movement of the cam 1 as a linear lifting movement to the associated gas exchange valve.
  • a pressure medium-actuated, guided by the cam 1 and radially infinitely retractable and extendable piston 12 is provided, the end forms at least part of the cam tip section 6.
  • the radial position of the piston 12 is dependent on the equilibrium of forces between the piston 12 radially inwardly urging spring forces and radially outwardly urging pressure forces of a pressure medium adjustable.
  • the lubricating oil of the internal combustion engine is preferably used.
  • the piston 12 is guided in a running in the direction of the cam center axis 14, continuous stepped bore 16 of the cam 1, wherein a coil spring 18 on the one hand on a nockengipfel solutionen step 20 of the stepped bore 16 and on the other hand on a side facing away from a bottom piston effective surface 22 annular surface 24 of the piston 12 is supported, at which the piston 12 widens in diameter stepwise.
  • the piston 12 therefore consists of a smaller diameter, in or by a nockgipfel technologyen portion 26 of the stepped bore 16 projecting head portion 28 and the active surface 22 containing, larger diameter bottom portion 30.
  • the coil spring 18 is then in an annular space 32 between the outer periphery of the head portion 28th the piston 12 and the inner periphery of the larger diameter portion 34 of the stepped bore 16 is held.
  • a pressure chamber 38 is formed, which is in communication with a coaxial with the camshaft axis 40 lubricating oil passage 42, the Pressure chambers 38 of the cam 1 of the camshaft 2 interconnects.
  • the closure piece 36 may be held in the stepped bore 16, for example by screwing. A nockengipfel here the closure piece 36 supporting, each end open sleeve 44 serves as a radially inner stop for the piston 12 at pressure drop in the pressure chamber 38, for example in case of failure of the pressure medium supply or at standstill of the internal combustion engine.
  • the piston 12 is urged by the action of the coil spring 18 against the sleeve 44 and thus held in a defined position.
  • the bush 44 in its peripheral wall with the openings of the lubricating oil passage 42 aligned openings.
  • the sleeve 44 could form a one-piece component with the closure piece 38.
  • the nockengipfel workede end 46 of the piston 12 is formed crowned.
  • a spherical bearing surface 50 corresponding to the radius of the ball 48 is formed on the cam tip end 46 of the piston 12, the edge 52 of which is crimped radially inward for grasping the ball 48.
  • the bearing surface 50 of the ball 48 is supplied by the lubricating oil system of the internal combustion engine with lubricating oil, to which the piston 12 has a bearing surface 50 of the ball 48 with the pressure chamber 38 connecting central channel 54.
  • each one of the lubricating oil passage 42 of the camshaft 2 upstream and each one the lubricating oil passage 42 downstream switching valve includes ,

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)

Claims (13)

  1. Dispositif de commande variable des soupapes d'échange de gaz d'un moteur à combustion interne, dont au moins une soupape est commandée par un arbre à cames (2) par l'intermédiaire d'une came (1) dont le contour présente un segment circulaire de base (4) et un segment sommital (6), le déplacement variable du contour de came étant assuré par un piston (12) mobile radialement en va-et-vient de manière continue à travers la came (1) sous l'action d'un agent de pression,
    caractérisé en ce que
    la came (1) présente un alésage étagé (16) continu dirigé selon l'axe médian (14) de la came et dans lequel se déplace le piston, alésage qui possède du côté du sommet de la came une section (26) de plus faible diamètre et une seconde section de diamètre plus grand, le piston (12) traversant par sa partie de tête (28) la section (26) de diamètre plus faible située du côté du sommet de la came, et formant à son extrémité (46) située du côté du sommet de la came au moins une partie du segment sommital de came (6).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    l'extrémité (46) du piston (12) située du côté du sommet de came est essentiellement bombée.
  3. Dispositif selon la revendication 2,
    caractérisé en ce que
    le piston (12), en cas de défaillance de l'alimentation en agent de pression, est maintenu dans une position définie.
  4. Dispositif selon la revendication 3,
    caractérisé en ce qu'
    à l'extrémité (46) du piston (12) située du côté du sommet de came, est montée en rotation une bille (48) qui peut rouler sur une portée de roulement (8) d'un poussoir (10) coopérant avec la came (1) concernée.
  5. Dispositif selon la revendication 4,
    caractérisé en ce qu'
    à l'extrémité (46) du piston (12) située du côté du sommet de came, est formée une portée de palier (50) sphérique correspondant au rayon de la bille (48) et dont le bord (52) est rabattu radialement vers l'intérieur pour tenir la bille (48).
  6. Dispositif selon la revendication 5,
    caractérisé en ce que
    la portée de palier (50) de la bille (48) est alimentée en huile de lubrification par le système d'huile de lubrification du moteur.
  7. Dispositif selon la revendication 6,
    caractérisé en ce que
    le piston (12) se déplace en ligne droite dans la came (1) sous l'action de l'huile de lubrification du moteur.
  8. Dispositif selon la revendication 7,
    caractérisé en ce que
    la position du piston (12) peut être réglée en fonction de l'équilibrage entre les forces élastiques poussant le piston (12) radialement vers l'intérieur, et les forces de pression exercées sur celui-ci radialement vers l'extérieur par l'huile de lubrification.
  9. Dispositif selon la revendication 7 ou 8,
    caractérisé en ce que
    le piston se déplace dans un alésage étagé (16) orienté selon la direction de l'axe médian de came (14), et un ressort hélicoïdal (18) s'appuie d'un côté sur un gradin (20) de l'alésage étagé (16) situé du côté du sommet de came, et de l'autre côté sur une portée annulaire (24) du piston (12) située à l'opposé de la surface active du piston (22) située du côté du fond.
  10. Dispositif selon la revendication 9,
    caractérisé en ce qu'
    entre la surface active (22) du piston (12) et une pièce de fermeture (36) montée à l'extrémité de l'alésage étagé (16) éloignée du segment sommital de came (6) est formée pour l'huile de lubrification une chambre de pression (38) reliée à un canal d'huile de lubrification (42) coaxial à l'axe (40) de l'arbre à cames.
  11. Dispositif selon la revendication 10,
    caractérisé en ce que
    sur la pièce de fermeture (36) s'appuie une douille (44) insérée dans l'alésage étagé (16) et qui sert de butée radialement interne pour le piston (12).
  12. Dispositif selon les revendications 4 à 11,
    caractérisé en ce que
    le piston (12) présente un canal (54) qui relie la portée de palier (50) de la bille (48) à la chambre de pression (38).
  13. Dispositif selon une des revendications précédentes,
    caractérisé en ce que
    la montée ou la baisse de pression dans les chambres de pression (38) des cames (1) équipées d'un piston (12) mobile en va-et-vient, est assurée par un système de soupapes qui comporte une soupape de commutation en amont du canal d'huile de lubrification (42) de l'arbre à cames (2) et une soupape de commutation en aval de ce canal (42).
EP02747200A 2001-08-24 2002-06-08 Dispositif pour commander de maniere variable les soupapes de changement des gaz d'un moteur a combustion interne Expired - Lifetime EP1490584B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10141605 2001-08-24
DE10141605A DE10141605A1 (de) 2001-08-24 2001-08-24 Vorrichtung zur variablen Steuerung der Gaswechselventile einer Brennkraftmaschine
PCT/DE2002/002092 WO2003018964A2 (fr) 2001-08-24 2002-06-08 Dispositif pour commander de maniere variable les soupapes de changement des gaz d'un moteur a combustion interne

Publications (2)

Publication Number Publication Date
EP1490584A2 EP1490584A2 (fr) 2004-12-29
EP1490584B1 true EP1490584B1 (fr) 2007-07-25

Family

ID=7696538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02747200A Expired - Lifetime EP1490584B1 (fr) 2001-08-24 2002-06-08 Dispositif pour commander de maniere variable les soupapes de changement des gaz d'un moteur a combustion interne

Country Status (6)

Country Link
US (2) US20050056243A1 (fr)
EP (1) EP1490584B1 (fr)
JP (1) JP2005507040A (fr)
KR (1) KR20040029303A (fr)
DE (2) DE10141605A1 (fr)
WO (1) WO2003018964A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10337430A1 (de) * 2003-08-13 2005-03-17 Fev Motorentechnik Gmbh Verbrennungskraftmaschine mit Schaltnocken
GB0620446D0 (en) * 2006-10-14 2006-11-22 Powertrain Technology Ltd Improvements to valve mechanisms with hydraulically actuated secondary opening
GB2443690B (en) * 2006-11-09 2011-10-12 Anthony Edgar Blackburn Retractable cam
JP5488512B2 (ja) * 2011-03-28 2014-05-14 三菱自動車工業株式会社 カム構造
KR200487935Y1 (ko) 2018-04-03 2018-11-23 정우형 에어 간판용 받침구

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB239579A (en) 1924-06-05 1925-09-07 Charles George Garrard Improvements in or relating to cam or like mechanism
DE3705128A1 (de) * 1987-02-18 1988-09-01 Opel Adam Ag Fuer eine brennkraftmaschine bestimmte nockenwelle
JPH01178710A (ja) 1988-01-06 1989-07-14 Mazda Motor Corp エンジンのバルブ駆動装置
US5253546A (en) * 1990-05-29 1993-10-19 Clemson University Variable valve actuating apparatus
US5404770A (en) * 1991-08-14 1995-04-11 Volkswagen Ag Variable cam arrangement for a lift valve
US5367990A (en) * 1993-12-27 1994-11-29 Ford Motor Company Part load gas exchange strategy for an engine with variable lift camless valvetrain
JPH07238820A (ja) * 1994-02-25 1995-09-12 Ofic Co リフト量可変バルブ駆動装置
EP0705382B1 (fr) 1994-03-03 1998-07-15 Christos Valasopoulos Systeme a bossage de came en forme de fleche a action variable

Also Published As

Publication number Publication date
US6928970B2 (en) 2005-08-16
DE50210574D1 (de) 2007-09-06
WO2003018964A3 (fr) 2004-11-04
KR20040029303A (ko) 2004-04-06
EP1490584A2 (fr) 2004-12-29
WO2003018964A2 (fr) 2003-03-06
DE10141605A1 (de) 2003-03-06
US20050056243A1 (en) 2005-03-17
JP2005507040A (ja) 2005-03-10

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