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WO1997039224A1 - Dispositif pour modifier les temps d'ouvertures et de fermeture de soupapes de changement des gaz dans un moteur a combustion interne - Google Patents

Dispositif pour modifier les temps d'ouvertures et de fermeture de soupapes de changement des gaz dans un moteur a combustion interne Download PDF

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Publication number
WO1997039224A1
WO1997039224A1 PCT/EP1996/005147 EP9605147W WO9739224A1 WO 1997039224 A1 WO1997039224 A1 WO 1997039224A1 EP 9605147 W EP9605147 W EP 9605147W WO 9739224 A1 WO9739224 A1 WO 9739224A1
Authority
WO
WIPO (PCT)
Prior art keywords
slide
adjusting piston
coupling
pressure chamber
drive unit
Prior art date
Application number
PCT/EP1996/005147
Other languages
German (de)
English (en)
Inventor
Andreas Strauss
Jochen Auchter
Rainer Ottersbach
Mike Kohrs
Original Assignee
INA Wälzlager Schaeffler oHG
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 INA Wälzlager Schaeffler oHG filed Critical INA Wälzlager Schaeffler oHG
Priority to DE19681401T priority Critical patent/DE19681401D2/de
Publication of WO1997039224A1 publication Critical patent/WO1997039224A1/fr

Links

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
    • F01L1/34—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
    • F01L1/34403—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft
    • F01L1/34406—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 helically teethed sleeve or gear moving axially between crankshaft and camshaft the helically teethed sleeve being located in the camshaft driving pulley

Definitions

  • the invention relates to a device for changing the opening and closing times of gas exchange valves of an internal combustion engine according to the precharacterizing features of claim 1.
  • the invention is therefore based on the object of presenting a device of the abovementioned type in which the disadvantages indicated have been eliminated and in particular by simple means, ie. H. with little design effort the displayed start rattling and a swinging of the adjustment angle between the camshaft and crankshaft is avoided while at the same time creating an inexpensive possibility of adjusting the play of its components which are in rotary engagement with one another.
  • the rattling noises occurring in the prior art due to high-frequency striking of the adjusting piston at its one end position can no longer be expected.
  • the adjusting piston is preferably held in one of its maximum possible stop positions ("late” or “early” opening of the gas exchange valves concerned). Due to the play adjusting means applied at the same time as the other, it is extremely successful to set the coupling position of the coupling means with respect to the desired stop position of the adjusting piston. Without this play setting option, in order to create a small torsional play of the device parts in the locked state, the toothed sections which are in engagement with one another and the coupling means would have to be manufactured extremely precisely in order to eliminate any overlapping tolerances. This possibility of adjusting the rotational position of the coupling means in relation to the stop position of the adjusting piston Before the internal combustion engine is started up for the first time, it is possible to compensate for any existing component tolerances and precisely define the coupling position of the adjusting piston.
  • the coupling means is designed as a hydraulically displaceable slide which can optionally be coupled to the exhaust or drive unit when the pressure on hydraulic means decreases.
  • the play setting means are to be connected to the slide in a rotationally fixed manner via an axial guide. These are for example after the game setting u. a. connected to the coupling means via a welded connection or caulking and can be produced as a sheet metal ring enclosing the coupling means.
  • a play setting between the coupling means and the output or drive element can also take place via communicating screw means, wedges and other machine elements, it is only important at this point that the components just mentioned are rotationally fixed to one another during operation of the device.
  • a coupling of the coupling means is preferably provided with the output unit.
  • the pressure chamber of the device is filled with hydraulic medium which faces away from the desired starting position of the adjusting piston, so that the adjusting piston is displaced into its desired starting position via the hydraulic medium. Since, according to a first proposal, the pressure chamber of the coupling means is identical to that of the adjusting piston, in this state there is not sufficient hydraulic medium pressure in front of the coupling means and the coupling means also moves (optionally), via its force, into its coupling position via the force of a spring means, which was previously adjustable by rotating the play setting means with respect to the drive unit.
  • the slide is designed, for example, as a concentric ring enclosing the output unit, so that it has a sufficiently large piston area for its hydraulic displacement has movement.
  • at least one "satellite-like" axially parallel slide in one of the pressure chambers it is also provided that the slide is moved into its coupling or decoupling position, for example via valve devices, by means of completely separate actuating means.
  • the slide is provided radially on the inside and outside with corresponding sealing means, such as sealing rings, which are positioned in complementary cutouts can.
  • the slide is displaced into its decoupling position via the hydraulic medium pressure, which is present anyway in one of the pressure chambers.
  • the pressure chamber of the slide should be identical to the pressure chamber which faces the device on the adjusting piston side and, according to a further development of the invention, the slide should be hydraulically coupled to the pressure chamber facing away from the device via a path. The latter measure proves to be particularly useful if the adjusting piston is said to have assumed a starting position that is remote from the device, i. H. axially facing outwards and at the same time is to be held in this position by the coupling means.
  • stop position identifies the early position of the adjusting piston (for adjusting devices on the outlet side) and, for reasons of installation space, a compression spring acting on the adjusting piston in the opposite direction to the rotational nonuniformities of the camshaft (acting in the "early" direction) on the device side Pressure chamber must be installed.
  • the stop position of the adjusting piston in the device is thus dependent on the application of the respective device (intake or exhaust camshaft or common assignment) and the arrangement of the serrated sections of the adjusting piston and the input and output unit are mutually dependent.
  • the adjusting piston is additionally to be sprung in an adjusting direction by the force of a compression spring or a similar spring means, this adjusting direction is, for example, that which is directed against the drag torque of the camshaft acting in the "late” direction . However, it can also run in the direction of the drag moments of the camshaft.
  • the specified separate path to a pressure chamber in front of the coupling means is, according to a concretization of the invention, arranged radially outside of an annular part radially enclosing the adjusting piston and is designed, for example, as an annular space.
  • this path it is also conceivable to design this path as a channel extending within the drive unit.
  • the clearance adjustment means designed as a ring can be provided on the end face with radially inward-facing approaches, through which approaches the coupling means are simultaneously given stops for its displacement movement.
  • the ring can also be designed such that it limits the device radially outward, as a quasi housing part, in the axial extension of the drive unit.
  • the slide should run as far as possible completely in a hole in the ring.
  • a solution is also conceivable and envisaged in which a plurality of coupling stages are realized via the coupling means via the adjusting range of the adjusting piston, so that a mechanical holding of the adjusting piston is produced via these coupling stages.
  • Any servo means but preferably hydraulic means, is intended as a means for adjusting the adjusting piston and the coupling means.
  • two basic coupling mechanisms are provided. On The first, preferred mechanism provides for the adjusting piston to be hydraulically displaced into its starting position (stop position) immediately before the internal combustion engine is switched off, and for there to be an immediate locking via the coupling means.
  • the coupling combustion engine may also conceivable for the coupling combustion engine to produce only after Wiederbefeuern the focal ⁇ by the adjusting erreich ⁇ in his first ten late position which he already due to the lack Hydraulikstoff ⁇ filling-an award by the Drehungieichförmtechnik the camshaft ⁇ want to couple and hold there until the device is again sufficiently filled with hydraulic fluid.
  • FIG. 1 shows a longitudinal section through a device according to the invention with decoupled coupling means
  • Figure 2 shows a device according to Figure 1 in mirror-image half section, but with a coupled coupling means and adjusting piston in a preferred coupling position;
  • Figure 3 is a partial view of a device similar to Figure 1 with a special design of the game adjusting means and
  • Figure 4 shows a device similar to that shown in Figure 1.
  • FIG. 1 shows a device 1 for changing the opening and closing times of gas exchange valves of an internal combustion engine, the structure and mode of operation of which are known in principle to those skilled in the art.
  • the device 1 exists from a drive wheel 2, which is fastened here on a hollow cylindrical drive unit 3.
  • the drive unit 3 has a radially outward toothing (helical toothing) 4 which interacts with an internal toothed section 5 of a hydraulically displaceable adjusting piston 6.
  • the adjusting piston 6 in turn has an external, helically toothed section 7 which engages with a toothing 8 of an output unit 9.
  • the output unit 9 is in turn non-rotatably connected to a camshaft, not shown.
  • the adjusting piston 6 delimits with its two end faces 10, 1 1 pressure chambers 12, 13 for hydraulic means.
  • This hydraulic displacement of the adjusting piston 6 in the axial direction leads via the toothing or sections 4, 5, 7, 8 to a relative rotation of the drive wheel 2 to the camshaft, not shown.
  • annular coupling means (slide) 15 adjoins the pressure chamber 12.
  • This coupling means 15 is connected radially on the outside via an axial guide 16 to a play adjusting means 17 to be explained later.
  • the play setting means 1 7 in turn experiences a torsion-proof connection with the drive means 3 (here also formed as a housing), for example via a weld 18.
  • this coupling means 15 has sealing means 19 which are designed radially on the inside and outside as sealing rings and which are arranged in a sealing manner with respect to the opposite parts 9, 17.
  • the coupling means 15 in the device direction, ie here in the direction of the pressure chamber 12 is spring-loaded via the force of a spring means 20, which surrounds the output unit 9 in a ring, such as a helical spring.
  • the slide has an extension 21 axially on the inside, which in a recess 22 of a radial projection 23 of the output unit 9 is opposite to one another in a rotational position from the drive unit 3 to the output unit 9.
  • the adjusting piston 6 executes an axial movement in the direction remote from the device and at the same time the pressure of hydraulic means also shifts the coupling means 15 axially outwards. The previously described anti-rotation device is thus canceled.
  • the game setting means 1 7 is canceled.
  • the play setting means 17 is connected to the coupling means 15 via an axial guide 16.
  • the adjusting piston 6 is brought into the stop position shown in FIGS. 2 and 4 by rotating the drive wheel 2 to the camshaft (not shown).
  • This stop position represents the desired coupling position.
  • a first stop is created in one direction of rotation, for example by abutment of the adjusting piston 6 (see FIG. 2) against a radially inwardly facing extension 24 of the play adjusting means 17 and a further stop in the further direction of rotation a surface of the recess 22 on which the projection 21 rests.
  • This location assignment can, however, only be manufactured in such a way that the position is precisely aligned such that in the stop position just described, shoulder 21 aligns with recess 22. It is therefore proposed according to the invention that a fine adjustment of a position assignment of the coupling position is created via the play setting means 17. Overlapping gear errors also influence each other. the exact position assignment from attachment 21 to recess 22. By turning the play adjusting means 1 7 directly before its rotationally fixed attachment to the drive means 3, the disadvantageous tolerances that have occurred up to that point are thus compensated for. After the game has been set, it is provided to connect the game setting means 17 to the drive unit 3, for example via the weld 18.
  • Figures 1 and 2 also disclose that the path 14 opens into the piston 15 limited by the slide 15 and adjusting piston 6 pressure chamber 12, d. H. a filling of hydraulic means causes a movement of the adjusting piston 6 and coupling means 15 at the same time axially away from one another.
  • FIGS. 1 to 3 show that the projection 24 of the play setting means 17 also serves as a travel limitation for the coupling means 15.
  • FIGS. 1 and 2 show that another Approach 25 at the further end of the play setting means 1 7 the axial movement of this can be limited in the additional direction.
  • FIG. 3 shows an alternative embodiment and arrangement of the game setting means 17 according to the aforementioned figures.
  • the play setting means 1 7 has a diameter reduction 26 on the device side, by means of which it is fastened in a rotationally fixed manner to an inner casing 27 of the drive unit 3 after the play has been set.
  • the adjusting piston 6 is sprung in a direction of displacement by the force of a compression spring 28.
  • This compression spring 28 is intended to displace the adjusting piston 6 against the alternating moments of the camshaft acting in the "late” direction.
  • the adjusting piston 6 is shown in Figures 3 and 4, for example, in its "early" stop position.
  • This stop position can be the desired starting position, for example, when a device 1 is applied to an exhaust camshaft, since only a slight valve overlap and thus low residual gas components in the cylinder can be expected by shifting the opening times of the exhaust valves in the direction of early opening and closing .
  • a ring part 29 is applied radially between the inner jacket 27 of the drive unit 3 and the adjusting piston 6.
  • the adjusting piston 6 runs sealingly within the ring part 29.
  • a path 30 designed as an annular space is arranged to a separate pressure chamber 31 for hydraulic medium.
  • This separate pressure chamber 31 is connected via path 30 to the pressure chamber 11 and lies directly in front of the coupling means 15.
  • the pressure chamber 11 becomes hydraulic means relieved, the pressure chamber 12 being loaded so that the coupling means 15 can be moved into the coupling position shown.
  • drive unit 3 and output unit 9 are positively coupled to one another after the internal combustion engine has been shut down. Only after it is possible in the pressure chamber 1 1 after the refiring To build up an adequate pressure of hydraulic medium in the internal combustion engine, the coupling just described can be released.
  • This embodiment is particularly advantageous when it is desirable to hold the adjusting piston 6 in its external stop position shown in FIG. 4 for the early position and there is insufficient space in the pressure chamber 11 for an arrangement of this compression spring 28 (with a reversal of the toothing and the stop position of the adjusting piston 6).
  • the play setting means 1 7, in the axial extension of the drive unit 2, performs its housing function at least with partial sections and thus limits the device 1 radially outward in the area of the coupling means 1 5.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve Device For Special Equipments (AREA)

Abstract

Dispositif (1) destiné à modifier les temps d'ouverture et de fermeture de soupapes de changement des gaz dans un moteur à combustion interne, présentant, d'une part, un moyen de couplage (15) permettant d'établir, en position de fin de course de son piston de réglage (6), une liaison de forme entre son unité de commande (3) et son unité de sortie (9) et, d'autre part, des moyens de réglage de jeu (17) permetttant d'obtenir, par torsion durant le montage final du dispositif (1), une coordination précise de la position de couplage de ses moyens de couplage (15) par rapport à la position de fin de course de son piston de réglage (6).
PCT/EP1996/005147 1996-04-12 1996-11-22 Dispositif pour modifier les temps d'ouvertures et de fermeture de soupapes de changement des gaz dans un moteur a combustion interne WO1997039224A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19681401T DE19681401D2 (de) 1996-04-12 1996-11-22 Vorrichtung zum Verändern der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996114558 DE19614558A1 (de) 1996-04-12 1996-04-12 Vorrichtung zum Verändern der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine
DE19614558.9 1996-04-12

Publications (1)

Publication Number Publication Date
WO1997039224A1 true WO1997039224A1 (fr) 1997-10-23

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ID=7791135

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/005147 WO1997039224A1 (fr) 1996-04-12 1996-11-22 Dispositif pour modifier les temps d'ouvertures et de fermeture de soupapes de changement des gaz dans un moteur a combustion interne

Country Status (2)

Country Link
DE (2) DE19614558A1 (fr)
WO (1) WO1997039224A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19718675A1 (de) * 1997-05-02 1998-06-18 Bayerische Motoren Werke Ag Hydraulische Stellvorrichtung zur relativen Winkelverstellung einer angetriebenen Welle, insbesondere Nockenwelle einer Brennkraftmaschine
DE10213081A1 (de) * 2002-03-20 2003-10-02 Hydraulik Ring Gmbh Ventilsteuerung zur Einstellung des Hubes von Ventilen in Kraftfahrzeugen

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0658112A (ja) * 1992-08-03 1994-03-01 Aisin Seiki Co Ltd 弁開閉時期制御装置
EP0652354A1 (fr) * 1993-10-06 1995-05-10 Carraro S.P.A. Variateur de calage entre le vilebrequin et l'arbre à cames d'un moteur à combustion interne

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239986A1 (en) * 1991-11-28 1993-06-03 Atsugi Unisia Corp Valve timing control system for IC engine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0658112A (ja) * 1992-08-03 1994-03-01 Aisin Seiki Co Ltd 弁開閉時期制御装置
EP0652354A1 (fr) * 1993-10-06 1995-05-10 Carraro S.P.A. Variateur de calage entre le vilebrequin et l'arbre à cames d'un moteur à combustion interne

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 18, no. 294 (M - 1616) 6 June 1994 (1994-06-06) *

Also Published As

Publication number Publication date
DE19681401D2 (de) 1999-03-11
DE19614558A1 (de) 1997-10-16

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