EP0668436B1 - Poussoir pour une soupape débrayable d'un moteur à combustion interne - Google Patents

Poussoir pour une soupape débrayable d'un moteur à combustion interne Download PDF

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Publication number
EP0668436B1
EP0668436B1 EP95101753A EP95101753A EP0668436B1 EP 0668436 B1 EP0668436 B1 EP 0668436B1 EP 95101753 A EP95101753 A EP 95101753A EP 95101753 A EP95101753 A EP 95101753A EP 0668436 B1 EP0668436 B1 EP 0668436B1
Authority
EP
European Patent Office
Prior art keywords
coupling member
tappet according
tappet
valve stem
locking
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
EP95101753A
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German (de)
English (en)
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EP0668436A1 (fr
Inventor
Joachim Gruenberger
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.)
Dr Ing HCF Porsche AG
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Dr Ing HCF Porsche AG
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Filing date
Publication date
Priority claimed from DE4444698A external-priority patent/DE4444698C2/de
Application filed by Dr Ing HCF Porsche AG filed Critical Dr Ing HCF Porsche AG
Publication of EP0668436A1 publication Critical patent/EP0668436A1/fr
Application granted granted Critical
Publication of EP0668436B1 publication Critical patent/EP0668436B1/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
    • F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
    • F01L13/0005—Deactivating 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
    • F01L1/12—Transmitting gear between valve drive and valve
    • F01L1/14—Tappets; Push rods
    • F01L1/143—Tappets; Push rods for use with overhead camshafts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/21—Elements
    • Y10T74/2101—Cams
    • Y10T74/2107—Follower

Definitions

  • the invention relates to a plunger for a switchable valve according to the preamble of Claims 1 and 30.
  • Such a plunger is known for example from DE-A-29 52 037.
  • This coupling member can be moved hydraulically and designed as a hydraulically operated piston.
  • This coupling element works together with a locking element with which it is in at least one end position can be locked.
  • the locking element is either a hydraulically unlockable Piston or a spring-loaded ball in a recess on the coupling member intervention. By pressurizing the tappet or the coupling member at the same time the locking device is unlocked or overpressed.
  • the coupling member can be used accordingly unfavorable alignment of the valve stem relative to the bore of the coupling member take the valve with you, but only over part of the lifting height, from where from the valve undamped into the valve seat under the action of the valve spring strikes back, which causes disturbing noises and additional wear.
  • the object of the invention is to provide a generic plunger, the Coupling member is held securely and defined at least in one end position and with its bore or support surface always functional to the valve stem is aligned.
  • the main advantages achieved with the invention are the fact that the Locking element locks the coupling member in an end position in which the valve takes the first switch position. This blocking is only under the influence of a defined cam track area for movement of the coupling member, in such a way that the locking of the coupling member can be released by the valve stem.
  • the coupling member becomes when the piston is pressurized first moved to an intermediate position and then in a second Cam track area - the valve stem is now outside the bore of the Coupling link - the second end position of the coupling link becomes functional reached.
  • the locking element is simple in construction and will forced from the end of the valve stem depending on the second Cam track area actuated.
  • the tappet is in the first switching position of the valve and depending on the cam track area by means of the hold-down in one of the cams kept separate position, which reduces the friction between cam and tappet is reduced.
  • the bearing part is not only suitable for the piston, the coupling member and the Compression spring to take up constructively cheap, but it can also be in the plunger, which is constructed in the manner of a cup with a jacket part and cup base, light integrate.
  • the plunger which is constructed in the manner of a cup with a jacket part and cup base, light integrate.
  • the cup of the pestle Bearing section the bore for the piston and a guide section for the Integrate coupling member, the bearing section and the guide section Can be housing that is made in one piece with the cup.
  • this cup On the On the side facing the cam, this cup is provided with an insert that has a Includes holder for the adjustment plate. This use, for example, from consists of ferrous metal material, is provided with the locking element.
  • the Locking element has a cooperating with the stop of the coupling member Lock bolt on by a resilient tongue in the carrier plate of the insert is formed.
  • the locking of the coupling member can advantageously by interlocking parts of the coupling member and its guideway.
  • the lock can then be easily moved by moving the two Loosen components relative to each other (lifting through the valve stem).
  • the switching reliability of such a plunger can be significantly improved once again be when the coupling member in its other end position by a unlockable locking element is set. This ensures that the Switching process in both directions in a precisely defined period of time or takes place during a defined angular position of the cam and thus the Switching process is carried out safely and defined in a short time. Increased wear is excluded.
  • This second locking device is advantageous also unlockable through the valve stem, so that all switching functions without constructive interventions on the camshaft can take place. This is the use of Standard camshafts possible.
  • the tappets according to the invention come with the same installation space as conventional plungers without switching devices need. This additional locking device can be advantageously in the Integrate coupling element and its guideway, so that additional construction costs is avoided and a safe function with a few components is guaranteed.
  • An internal combustion engine has one in the area shown cylindrical plunger 1, which is assigned to a switchable valve 2 and by means of a camshaft 4 having a cam 3 is actuated.
  • the plunger 1 is in a bore 5 of a cylinder head 6 is inserted and is supported by a compression spring 7 from.
  • the valve 2 includes one with a valve seat 8 of the cylinder head 6 cooperating valve plate 9 and a valve stem 10 with a Valve spring plate 11 is provided. Is between valve spring plate 11 and cylinder head 6 a valve spring 12 is effective which holds the valve 2 in the closed position.
  • a device 13 is arranged within the plunger 1, with the two Switch positions for valve 2 are adjustable: first switch position SI (FIGS. 2 and 9), Valve 2 rests on valve seat 6: second switch position SII (Fig. 10), valve leads corresponding to those triggered by the cam 3 and the plunger 1 Alternating movements.
  • the device 13 is formed by a piston 14 and a coupling member 15, the in the first switching position SI (Fig. 7 and 8), the end position A (Fig. 8 and 9) and in the second switching position SII (Fig. 10) assumes the end position B (Fig. 10).
  • the piston 14 directly moves that designed as a slide Coupling member 15 from end position A to end position B by said piston on a Upright support surface 16 (Fig. 2) of the coupling member 15 engages.
  • a compression spring 18 At a spaced or distant from the support surface 16 of the support surface 17 Coupling member 15 is supported by a compression spring 18.
  • the compression spring 18 is looking for that To move coupling member 15 into position A; for this function is also a hydraulically operated piston conceivable.
  • the coupling member 15 has a bore 19 provided, in which the valve stem 10 in the end position A of the coupling member 15 immersed in the switching position SI of the valve 2 (Fig. 8 and 9).
  • the coupling member 15 On the Valve 2 facing side, the coupling member 15 is provided with a support surface 20.
  • the end 21 of the valve stem is supported on it when the coupling member 15 is is in end position B or a region close to this position (FIG. 10).
  • the piston 14 and the coupling member 15 are installed in a bearing part 22, the one in the radial direction of the plunger 1 extending bore 23 for the piston 14 and a Has recess 24 shown as a guide, in which the coupling member 15th relatively movable - end positions A and B (Fig. 9 and 10) - is mounted.
  • the piston 14 is acted upon by an opening 25 in the plunger 1 with hydraulic medium and acts, as described above, directly together with the coupling member 15.
  • the Ends of the compression spring 18 are from a pin 26 of the coupling member 15 or a bore 27 of the bearing part 22 is added.
  • the bearing part an opening 28 which is incorporated in a sliding web 29 of the bearing part 22.
  • the plunger 1 is constructed in the manner of a cylindrical cup 30, i.e. he comprises a jacket part 31 and a cup base 32, which is a short distance apart extends to a side 33 of the cup 30 adjacent to the cam 3 and as Recording 34 is formed for an adjustment plate 35.
  • the bearing part 22 is arranged within the thereby in the pestle 1 resulting relatively large space 36.
  • the Bearing part 22 can be designed as an insert, which can be arranged in space 36 with suitable means is attached.
  • the coupling member 15 is in the first end position A by means of a locking element 37 fixed (Fig. 9), if the piston 14 is depressurized, the valve 2 the first Switch position SI occupies and one over a cam base 38 and one Cam flank 39 extending cam track area NbI facing the plunger 1 or is effective on it.
  • a second cam track area NbII which is the cam tip 40, which on a longitudinal center plane intersecting the center Z of the camshaft 4 H-H of the cam 3 lies, includes and the first switching position SI of the valve stem 2 unlocks the valve stem 10 immersed in the bore 19 with its end 21 Locking element 37. This causes the piston 14 to be under pressure Coupling member 15 against the action of the compression spring 18 from the position A in the Position Zs moved.
  • the locking element 37 inserted between the cup base 32 and the bearing part 22 comprises a locking bolt 42 facing the end 21 of the valve stem 10, the spring and is angularly movable and with its locking bolt end 43 on a stop 44 of the Coupling member 15 is aligned (Fig. 9).
  • the end 21 of the valve stem 10 actuates the locking bolt 42 from the locking position E into the unlocking position F (Fig. 9 and 2) against the action of a spring 45.
  • the locking bolt 42 Angular movements in the area of the angle.
  • the locking element 37 On the locking bolt 42nd opposite side at 46, the locking element 37 is mounted hinge-like.
  • the coupling member 15 With the coupling member 15 is a hold-down 52, which the plunger 1 in the holds the first switching position SI of the valve 2 in position at a distance As on the valve 2 (FIG. 9).
  • the hold-down 52 which is integrally connected to the coupling member 15, has an extension 53 running parallel to the valve 2, at the free end of an Projection 54 is provided.
  • the projection 54 engages in the position Ni in which the Tappet 1 is held on the valve stem 10 by means of the hold-down device 52, in a groove 55 the valve stem 10 a.
  • the tappet 56 comprises a jacket part 57, which has a bearing section 58 for a bore 59 of a piston 60 and a guide section 61 for a Coupling member 62 is provided.
  • the bearing section 58 and the guide section 61 is provided on a carrier 63, the opposite regions 64 and 65 of the Sheath part 57 connects together.
  • the carrier 63 is radial extending webs 66, 67 supported against the jacket part 57.
  • the jacket part 57 is also on the side 68 facing a cam, not shown an insert 69 designed as a closing part.
  • the insert 69 is made of steel manufactured and protrudes into the jacket part 57 with a first collar 70.
  • At 71 is the collar 70 is caulked so that the insert 69 is positively held in position.
  • a second collar 72 extends in the opposite direction and forms together with a support plate 73, a receptacle 74 for an adjusting plate 75 Support plate 73, a locking element 75 is provided, which in the locked position E with a Locking bolt 76 is aligned with a stop 77 of the coupling member 62.
  • At 78 is a support track on which the locking bolt 76, the resilient tongue the support plate 73, rests when the valve 79 takes the circuit SI, the Piston 80 is pressurized against the action of the spring 81 and the Cam track area NbII abuts on the tappet 56; under these conditions is the Unlocked position F of the locking bolt 76 given (Fig. 3).
  • the piston 60 is depressurized in the first switching position SI and is hydraulic medium not effective and a valve stem 82 can be in a bore 83 of the coupling member 62 occur.
  • the valve 79 is shut down. But there is also the possibility that To design the coupling member 62 so that the valve stem 82 when the piston 80 is depressurized is supported on a support surface 84 of the coupling member 62: the valve 79 activated.
  • the valve when the piston is pressurized switched off and in the other end position of the Coupling element activated is the valve when the piston is pressurized switched off and in the other end position of the Coupling element activated.
  • this third differs Embodiment of the two previously described by an additional Locking device in which the coupling member also in its second end position is releasably locked.
  • the plunger 1 of this Embodiment is also in the form of a cup 30.
  • the piston 14 for Actuation of the coupling member 15 is in an extension projecting into the interior 85 of the jacket part 31 out.
  • the room 36 is at the bottom by a Guide plate 86 completed on a rotating stage 87 on the Bears against the inside of the jacket part 31.
  • This guide plate 86 has an opening 88 provided by the, with the appropriate position of the coupling member 15, the Valve stem 10 penetrates.
  • the side of the coupling member 15 facing Guide plate 86 is designed as a guide track 89 on which the Coupling member 15 sliding through the interaction of piston 14 and compression spring 18th can move.
  • a plate-shaped molded part 90 is also inserted into the space 36, that bears against the inside of the cup base 32. Of this molded part 90 is - Similar to the second embodiment - the locking bolt 76 as a resilient tongue punched out.
  • the molded part 90 further contains not shown Guideways in which the coupling member 15 is guided.
  • a lower portion 91 formed, which serves as an end stop for the Coupling member 15 is used. Is the coupling member 15, as shown in Fig. 11, on Section 91, the locking bolt 76 acts with the stop 77 of the coupling member 15 together. In this end position of the coupling member, the valve stem 10 can the opening 88 in the guide plate 86 into the bore 19 of the coupling member 15 immerse yourself.
  • the underside of the coupling member 15 facing the guide plate 86 is included provided an extension 92, the dimensions of this embodiment correspond approximately to those of the valve stem 10, and that of the one shown in FIG. 13 another end position of the coupling member 15 dips into the opening 88.
  • an extension 92 Through the resilient action of the locking bolt 76 on the top of the coupling member 15 rests, this is pressed against the guide track 89, so that when there is a corresponding Positioning of the extension 92 dips into the opening 88 and the coupling member 15 is lowered and held accordingly.
  • the coupling member 15 after pressurizing the piston 14 in In its first (right) end position, the valve is switched off.
  • the coupling member 15 is by the cooperation of the locking bolt 76 and the stop 77 against the Effect of the compression spring 18 held in this end position. If the piston 14 relieved, the coupling member 15 by the action of the compression spring 18 in his second (left) end position are pushed back, provided that the interlock between Locking bolt 76 and stop 77 on the coupling member 15 through the valve stem 10 analog to the previously described mode of operation is solved.
  • the coupling member 15 is about the intermediate position Zs pushed back into the (left) end position (Fig. 11 to 13).
  • the coupling member 15 If the coupling member 15 is in its second (left) end position (FIG. 13), it is pressed down by the resilient action of the locking bolt 76 that the extension 92 dips into the opening 88. In this position the Coupling member 15 of the piston 14 pressurized, the coupling member can only be moved until the extension 92 abuts the edge of the opening 88. In order to locking in this second end position is ensured.
  • the valve stem 10 abuts the coupling member 15 or the extension 92. The valve is activated. This Locking can also be released through the valve stem. As long as the cam 3 in Area of its base circle 38 cooperates with the adjusting plate 35 is located the plunger 1 in the position shown in Fig. 13.

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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)

Claims (36)

  1. Poussoir (1; 79) pour une soupape débrayable (2) d'un moteur à combustion interne, avec un dispositif comprenant un piston (14; 60) actionné hydrauliquement et un organe d'accouplement (15; 62) actionné par le piston (14; 60), dispositif au moyen duquel la soupape (2) est débrayée, dans une première position de commutation, et activée, dans une deuxième position de commutation, pour assurer la commande de la distribution de gaz, le poussoir (1;79) coopérant avec une came (39) d'un arbre à came (4) et un élément de blocage (37; 76) étant associé à l'organe d'accouplement (15; 62), caractérisé en ce que l'élément de blocage (37; 76) coopère avec la tige de soupape (10; 82) de manière que, dans une zone de piste de came (NbII), définie lorsque l'on est à l'état dans lequel la tige de soupape (10; 82) plonge dans un perçage (19; 83) de l'organe d'accouplement (15; 62), l'élément de blocage (37; 76) est déverrouillé.
  2. Poussoir selon la revendication 1, caractérisé en ce que, dans une première zone de piste de came (NbI) et dans l'une des positions de commutation (SI) de la soupape (2; 79), l'organe d'accouplement (15; 62) est fixé, dans une première position finale (A), au moyen de l'élément de blocage (37; 76) alors que, par contre, dans une deuxième zone de piste de came (NbII) pour cette position de commutation (SI), l'élément de blocage (37; 67) est actionné par la tige de soupape (10; 82), faisant que, par une coopération d'un piston (14; 80) pouvant être sollicité par une pression et par l'effet d'un ressort (ressort de compression 18; 81), l'organe d'accouplement (15, 62) est déplacé de la première position finale (A), d'abord en une position intermédiaire (Zs) et, au passage dans la première zone de piste de came (NbI) suivante, en une deuxième position finale (B), d'où il est ramené à la première position finale (A), au passage dans la première zone de piste de came (NbI), lorsque le piston (14; 79) et le ressort (ressort de compression (18; 81) coopèrent en en sens inverse.
  3. Poussoir selon la revendication 1 ou 2, caractérisé en ce que l'élément de blocage (37; 76) comprend un verrou de blocage (42; 76), tourné vers une extrémité (41) de la tige de soupape (10; 81) et doté d'une élasticité et d'une mobilité angulaire et orienté, par une extrémité de verrou de blocage (43), vers une butée (44; 77) de l'organe d'accouplement (15; 62).
  4. Poussoir selon l'une des revendications précédentes, caractérisé en ce que le verrou de blocage (42; 76) est déplacé d'une position de blocage (E) à une position de déverrouillage (F), dans la deuxième zone de piste de came (NbII), par l'extrémité (21) de la tige de soupape (10; 82) ayant plongé dans le perçage (19; 83) de l'organe d'accouplement (15; 62).
  5. Poussoir selon l'une ou plusieurs des revendications précédentes caractérisé en ce que l'organe d'accouplement (15; 62) comporte des faces d'appui (16, 17) espacées, sur lesquelles prennent appui le piston (14; 60) et le ressort de compression (18; 81).
  6. Poussoir selon l'une des revendications précédentes, caractérisé en ce que le poussoir (1), dans la première position de commutation (S1), est fixé au moyen d'un dévêtisseur (52) qui coopère avec la tige (10).
  7. Poussoir selon la revendication 6, caractérisé en ce que le dévêtisseur (52) plonge par une saillie (54) dans une gorge (55) de la tige de soupape (10).
  8. Poussoir selon la revendication 6, caractérisé en ce que le dévêtisseur (52) est fabriqué d'une seule pièce avec l'organe d'accouplement (15).
  9. Poussoir selon l'une des revendications précédentes, caractérisé en ce que le diamètre (Bd) du perçage (19; 83) destiné à recevoir la tige de soupape (10; 82) dans l'organe d'accouplement (14; 62), pour obtenir la position intermédiaire (Zs), est supérieur au diamètre (Vd) de la tige de soupape (10; 82).
  10. Poussoir selon l'une des revendications précédentes, caractérisé en ce que l'élément de blocage (37) est monté, sur le côté opposé au verrou de blocage (42), à la façon d'une charnière, avec un coudage (47).
  11. Poussoir selon l'une des revendications précédentes, caractérisé en ce que l'organe d'accouplement (15) est inséré dans une partie formant palier (22), qui présente un perçage (23) destiné au piston (14) et une nervure de glissement (29) destinée à l'organe d'accouplement (15), la nervure de glissement (29) étant dotée d'une ouverture (28) destinée à la tige de soupape (10).
  12. Poussoir selon la revendication 11, caractérisé en ce que le ressort de compression (18) coopère par son extrémité avec des moyens supports (tourillon 26 et ouverture 27) de l'organe d'accouplement (15) et de la partie formant palier (22).
  13. Poussoir selon l'une des revendications précédentes, caractérisé en ce que le poussoir (1) est construit à la façon d'une tasse (30) et comprend une partie enveloppe (31) et un fond de tasse (32), le fond de tasse (32) étant réalisé, sur le côté (33) tourné vers la came (3), sous forme de logement (34) pour une plage de réglage (35), la partie formant palier (22) avec le piston (14), l'élément de blocage (37), l'organe d'accouplement (15) et le ressort de compression (18), étant insères dans un espace (36).
  14. Poussoir selon la revendication 13, caractérisé en ce que l'élément de blocage (37) est disposé entre le fond de tasse (32) et l'organe d'accouplement (15).
  15. Poussoir selon la revendication 13 ou la revendication 14, caractérisé en ce que l'organe d'accouplement (15) présente une piste d'appui (51) destinée à l'élément de blocage (42), piste s'étendant à une distance (J) du fond de tasse (32).
  16. Poussoir selon l'une des revendications 1 à 9, caractérisé en ce qu'il comprend une partie enveloppe (57) avec une section formant palier (58), pour le perçage (59) du piston (60), et une section formant organe de guidage (61), pour l'organe d'accouplement (62).
  17. Poussoir selon la revendication 16, caractérisé en ce que la section formant palier (58) et la section de guidage (61) sont réalisées d'une seule pièce avec la partie enveloppe (57).
  18. Poussoir selon la revendication 17, caractérisé en ce que la section formant palier (58) et la section de guidage (61) sont prévues sur un support (63) reliant les zones d'enveloppe (64, 65) opposées.
  19. Poussoir selon la revendication 18, caractérisé en ce que le support (63) est soutenu par rapport à la partie enveloppe (57) au moyen de nervures (66, 67).
  20. Poussoir selon l'une des revendications 16 à 19, caractérisé en ce que la partie enveloppe (57) présente, sur la face (68) tournée vers la came, un insert (69) doté d'un logement (74) pour la plaque de réglage (75).
  21. Poussoir selon la revendication 20, caractérisé en ce que l'insert (69) comprend, dans la zone d'une plaque support (73) destinée à la plaque de réglage (75), l'élément de blocage (76) réalisé sous forme de languette élastique.
  22. Poussoir selon la revendication 20 ou 21, caractérisé en ce que l'insert (69) est constitué d'un matériau métallique ferreux.
  23. Poussoir selon l'une des revendications 2 à 22, caractérisé en ce que l'organe d'accouplement (15; 62) coopère, dans sa deuxième position finale (B), avec un dispositif de blocage (88, 82) supplémentaire pouvant également être déverrouillé par la tige de soupape (10; 82).
  24. Poussoir selon la revendication 23, caractérisé en ce que l'organe d'accouplement (15; 62) est déplaçable sur une piste de guidage (89) et est susceptible d'en être soulevé à peu près perpendiculairement par la tige de soupape (10; 82), et en ce que le deuxième dispositif de verrouillage (88, 92) est constitué par des pièces s'engageant les unes dans les autres de façon désolidarisable, appartenant à l'organe d'accouplement et à la piste de guidage.
  25. Poussoir selon l'une des revendications 23 à 24, caractérisé en ce que l'organe d'accouplement (15; 62) est susceptible d'être levé de la tige de soupape (10; 82) à l'encontre de l'effet d'un élément élastique (76).
  26. Poussoir selon la revendication 25, caractérisé en ce que l'élément élastique est constitué par l'élément de blocage (76).
  27. Poussoir selon l'une des revendications 24 à 26, caractérisé en ce que la piste de guidage (89) présente une ouverture (88) dans laquelle, dans la position de verrouillage de l'élément de blocage supplémentaire, s'engage un prolongement (92) de l'organe d'accouplement (15; 62).
  28. Poussoir selon l'une des revendications 13 à 15, caractérisé en ce que l'élément de blocage (76) est réalisé sur une pièce profilée (90) insérée dans la tasse (30).
  29. Poussoir selon l'une des revendications 24 à 28, caractérisé en ce que la pièce de guidage (89) est réalisée sur une plaque de guidage (86) qui est insérée dans la tasse (30), en ce que cette plaque de guidage (86) est susceptible d'être traversée par la tige de soupape (10) et en ce que l'organe d'accouplement est déplaçable sur la plaque de guidage (89).
  30. Poussoir (1; 79) pour une soupape débrayable (2) d'un moteur à combustion interne, avec un dispositif comprenant un piston (14; 60) actionné hydrauliquement et un organe d'accouplement (15; 62) actionné par le piston (14; 60), dispositif au moyen duquel la soupape est débrayée, dans une première position de commutation, et activée, dans une deuxième position de commutation, pour assurer la commande de la distribution de gaz, le poussoir (1;79) coopérant avec une came (39) d'un arbre à came (4) et l'organe d'accouplement (15; 62) étant déplaçable sur une piste de guidage (89), caractérisé en ce que l'organe d'accouplement (15; 62) est susceptible d'être soulevé de la tige de soupape (10; 82), à peu près perpendiculairement par rapport à celle-ci, et en ce que, dans une position finale, l'organe d'accouplement est verrouillé au moyen de partie (88; 92) s'engageant les unes dans les autres de façon désolidarisable et appartenant à l'organe d'accouplement et à la piste de guidage.
  31. Poussoir selon la revendication 30, caractérisé en ce que l'organe d'accouplement (15; 62) coopère dans sa deuxième position finale avec un élément de blocage supplémentaire (37; 76) qui est également déverrouillable vis à vis de la tige de soupape (10; 82).
  32. Poussoir selon l'une des revendications 30 et 31, caractérisé en ce que l'organe d'accouplement (15; 62) est susceptible d'être soulevé de la tige de soupape (10; 82) à l'encontre de l'effet d'un élément élastique (76).
  33. Poussoir selon la revendication 32, caractérisé en ce que l'élément élastique est constitué par l'élément de blocage (76).
  34. Poussoir selon l'une des revendications 30 à 33, caractérisé en ce que la piste de guidage (89) présente une ouverture (88) dans laquelle s'engage un prolongement (92) de l'organe d'accouplement (15; 62).
  35. Poussoir selon l'une des revendications 30 à 34, caractérisé en ce que l'élément de blocage (76) est réalisé sur une pièce profilée (90) insérée dans le poussoir (30) en forme de tasse.
  36. Poussoir selon l'une des revendications 30 à 35, caractérisé en ce que la piste de guidage (89) est réalisée sur une plaque de guidage (86) qui est insérée dans le poussoir (30) en forme de tasse, en ce que cette plaque de guidage (86) est susceptible d'être traversée par la tige de soupape (10), et en ce que l'organe d'accouplement est déplaçable sur la plaque de guidage (89).
EP95101753A 1994-02-18 1995-02-09 Poussoir pour une soupape débrayable d'un moteur à combustion interne Expired - Lifetime EP0668436B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE4405190 1994-02-18
DE4405190 1994-02-18
DE4444698A DE4444698C2 (de) 1994-02-18 1994-12-15 Stößel für ein abschaltbares Ventil einer Brennkraftmaschine
DE4444698 1994-12-15

Publications (2)

Publication Number Publication Date
EP0668436A1 EP0668436A1 (fr) 1995-08-23
EP0668436B1 true EP0668436B1 (fr) 1998-08-12

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EP95101753A Expired - Lifetime EP0668436B1 (fr) 1994-02-18 1995-02-09 Poussoir pour une soupape débrayable d'un moteur à combustion interne

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US (1) US5558052A (fr)
EP (1) EP0668436B1 (fr)
JP (1) JPH07259520A (fr)
CN (1) CN1111712A (fr)

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DE4444699A1 (de) * 1994-12-15 1996-06-20 Porsche Ag Stößel für ein schaltbares Ventil einer Brennkraftmaschine
DE19544473C2 (de) * 1995-11-29 1999-04-01 Daimler Benz Ag Mechanisch-hydraulisch arbeitende Steuerung für ein Gaswechselventil einer Brennkraftmaschine
JP3400686B2 (ja) * 1997-09-12 2003-04-28 アイシン精機株式会社 エンジンの可変動弁装置
DE19837098A1 (de) * 1998-08-17 2000-02-24 Porsche Ag Verfahren zum Betrieb einer mehrzylindrigen Brennkraftmaschine und Ventiltrieb einer mehrzylindrigen Brennkraftmaschine
JP4067662B2 (ja) 1998-09-14 2008-03-26 本田技研工業株式会社 バルブ休止機構を有する内燃機関の弁装置
US6196176B1 (en) * 1998-12-15 2001-03-06 Ina Walzlager Schaeffler Ohg Switchable cam follower
JP4163315B2 (ja) * 1999-01-11 2008-10-08 本田技研工業株式会社 エンジンの動弁装置
ITMI20011059A1 (it) 2001-05-22 2002-11-22 Ausimont Spa Composizioni fluoroelastomeriche
US6477997B1 (en) 2002-01-14 2002-11-12 Ricardo, Inc. Apparatus for controlling the operation of a valve in an internal combustion engine
DE50309366D1 (de) * 2003-04-04 2008-04-24 Ford Global Tech Llc Verfahren zum Betrieb einer Brennkraftmaschine mit zwei Einlassventilen
US7036465B2 (en) * 2004-03-17 2006-05-02 Ricardo, Inc. Two-stroke and four-stroke switching mechanism
DE102008031311A1 (de) * 2007-07-20 2009-01-22 Schaeffler Kg Schaltbarer Tassenstößel für einen Ventiltrieb einer Brennkraftmaschine
KR101241569B1 (ko) 2007-11-20 2013-03-08 현대자동차주식회사 가변 밸브 리프트의 가변 태핏
JP2012172609A (ja) 2011-02-22 2012-09-10 Suzuki Motor Corp 動弁装置及びエンジン

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Also Published As

Publication number Publication date
JPH07259520A (ja) 1995-10-09
US5558052A (en) 1996-09-24
CN1111712A (zh) 1995-11-15
EP0668436A1 (fr) 1995-08-23

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