WO1997017529A1 - Dispositif d'arret pour piston d'ajustage d'arbre a cames - Google Patents

Dispositif d'arret pour piston d'ajustage d'arbre a cames Download PDF

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Publication number
WO1997017529A1
WO1997017529A1 PCT/EP1996/002834 EP9602834W WO9717529A1 WO 1997017529 A1 WO1997017529 A1 WO 1997017529A1 EP 9602834 W EP9602834 W EP 9602834W WO 9717529 A1 WO9717529 A1 WO 9717529A1
Authority
WO
WIPO (PCT)
Prior art keywords
pin
piston
pressure
internal combustion
combustion engine
Prior art date
Application number
PCT/EP1996/002834
Other languages
German (de)
English (en)
Inventor
Ulrich Kramer
Original Assignee
Ina Wälzlager Schaeffler 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 Ina Wälzlager Schaeffler Kg filed Critical Ina Wälzlager Schaeffler Kg
Priority to DE19680952D priority Critical patent/DE19680952D2/de
Priority to DE19680952A priority patent/DE19680952C1/de
Publication of WO1997017529A1 publication Critical patent/WO1997017529A1/fr

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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
    • F01L1/34—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 an internal combustion engine controlled by a gas exchange valve, with at least one camshaft mounted in the cylinder head and a device serving for the relative rotation of the camshaft relative to a drive wheel, which has an adjusting piston which can be displaced between two end positions and which has a first toothing with the camshaft and a second The toothing is positively connected to the drive wheel, the adjusting piston being arranged in a cylindrical housing and delimiting two separate pressure chambers in the latter, which can be switched alternately by a pressure medium inflow or with a pressure oil return flow, and the actuating piston when the internal combustion engine is at a standstill a basic position is shifted and abuts an end stop.
  • DE-A 40 07 981 shows a generic state of the art.
  • the pressure medium - the lubricating oil of the pressure circulation lubrication - escapes from the pressure chambers without pressure via the connecting line into the lubricating oil reservoir while the internal combustion engine is at a standstill.
  • the actuating piston Due to the one-sided arrangement of the compression spring, the actuating piston is supported when it is moved to the basic position, ie until it rests on a cover. This means that there is no hydraulic preload on the adjusting piston.
  • the internal combustion engine is started until a lubricating oil pressure is built up and the pressure spaces are adequately filled, the engine has Piston a certain degree of freedom.
  • the actuating piston Due to the alternating torques and the associated rotational non-uniformity of the camshaft, the actuating piston is excited at high frequency and thereby carries out an oscillating movement in which it hits the end stop of the housing together with a considerable amount of noise. This noise emission is not accepted for the current state of development of internal combustion engines that are intended for vehicles.
  • the rattling noises triggered by the actuating piston continue to cause an increase in wear, which can result in a functional impairment of the adjusting device.
  • the invention has for its object to provide a device that favors the starting behavior of the internal combustion engine and effectively prevents noise from the actuating piston in the starting phase of the internal combustion engine using simple design means.
  • this object is achieved in that during a start phase of the internal combustion engine, a holding member opposes the actuating piston
  • the housing is locked depending on the oil pressure, the locking being arranged in the pressure chamber which can be acted upon by a basic position (starting position) in order to displace the actuating piston.
  • This locking causes the actuating piston in the starting phase of the engine, regardless of the alternating torques of the camshaft, to rest against the housing of the device in an end position and thus does not cause any disadvantageous noise development or does not result in an unfavorable position for starting the internal combustion engine is moved.
  • the locking has an oil pressure-dependent mode of operation, so that the actuating piston is initially fixed in position in the starting phase, ie when the oil pressure is not yet sufficient.
  • the locking of the actuating piston is released, with the actuating piston already being sufficiently hydraulically pretensioned in this phase, no disadvantageous noise emission caused.
  • the locking device according to the invention can be produced inexpensively by using simple constructive means and is designed so compact that it can be integrated into the existing installation space of the camshaft adjustment device.
  • Another advantage of the device according to the invention in which the piston is locked by an oil pressure-dependent mode of operation compared to a direct, switchable positive connection between components of the drive member and the output member during the depressurized starting phase of the internal combustion engine, is the realizable larger relative path that the pin of the holding member sweeps over the entire adjustment range. On the one hand, this reduces the force on the pin with the same alternating torque or friction torque and, on the other hand, the placement of the locking position with the same manufacturing tolerances is more precise.
  • a preferred embodiment of the invention provides, as a holding member, a pin which can be acted upon by the oil pressure against a compression spring and which is arranged in a bore in the actuating piston, the pin latching into a circumferential groove or a puncture or bore in the housing in order to achieve locking.
  • This holding member comprises few components and is compact and simple to insert into existing components of a device for cam white adjustment.
  • the invention provides for the formation of a holding member in the housing, against the force of a compression spring from the oil pressure displaceable pin, which automatically locks into a circumferential groove, puncture or bore provided in the piston. This results in a mode of action comparable to the locking described above.
  • the pin is provided on the side facing away from the circumferential groove with a piston which is guided in a sealed manner on a bore wall of the bore or a blind bore.
  • the arrangement provides that a cross-sectional area of the pin can be acted upon together with a piston ring surface of the piston by the oil pressure.
  • This structure favors the pressure medium applied to the holding member and the use of a larger compression spring, which is supported on the piston on the side facing away from the pin.
  • the concept of the invention enables the locking device to be released from a predetermined oil pressure.
  • An advantageous design provides that the holding member is released before the actuating piston is axially displaced. This ensures that there is no force-loaded contact of the pin on a side wall of the circumferential groove, as a result of which the actuating force increases due to increasing frictional forces and there is a risk that the pin remains in the circumferential groove and the adjusting device is disabled.
  • a correspondingly large-sized pressurized area in relation to the spring force of the compression spring can ensure that the pin only moves when the actuating piston reaches an end position shifted radially into the circumferential groove.
  • a locking of the actuating piston can be ensured, which only takes place when the pressure in the pressure chamber falls below a minimum.
  • a preferred embodiment of the invention provides a spherical shape
  • Front face of the pin which is alternatively or additionally provided with a low-friction and low-wear coating. This configuration favors this
  • Lock in the circumferential groove and increases the service life of the locking device or the holding member and thus the camshaft adjustment device.
  • a conically shaped end of the pin is provided, which positively engages in a circumferential groove which has a cross-sectional profile adapted to the shape of the pin.
  • FIG. 1 shows a longitudinal section of an adjusting device according to the invention
  • Figure 2 shows the detail "A" on an enlarged scale according to Figure 1;
  • FIG. 3 shows the detail “B” from FIG. 1 on an enlarged scale.
  • FIG. 1 shows a device 1 with a structure known per se, through which the control times of gas exchange valves of an internal combustion engine can be varied.
  • the device 1 is arranged in an axial extension on the end face of a camshaft 2 and comprises a drive wheel 3 which, via a traction mechanism drive, which is not shown in FIG. 1, drives one Experienced crankshaft of the internal combustion engine.
  • the drive wheel 3 is provided in one piece with a radially inwardly directed ring section 4, which is engaged on the inside via a toothing 5, 6 with a sliding sleeve 7.
  • the sliding sleeve 7 is in turn positively connected with a toothing 8, 9 to a toothed sleeve 10 which is arranged on the camshaft 2 on the end face in a rotationally fixed manner.
  • the sliding sleeve 7 has an actuating piston 11 on the end face on the side facing away from the camshaft 2, which rests sealingly on a housing 12 on the outside.
  • the actuating piston 11 each delimits a pressure chamber 13, 14, which can be acted upon alternately to achieve an axial displacement of the actuating piston 11 with a pressure medium.
  • Axial displacement of the actuating piston 11 results in relative rotation between the drive wheel 3 and the camshaft 2 due to the meshing teeth 5, 6 and 8, 9, which are each designed as helical teeth.
  • a compression spring 15 can be provided, which is inserted in the pressure chamber 14 between the actuating piston 1 1 and the ring section 4 and the Adjusting piston 1 1 shifted to an end stop 1 7.
  • a holding member 16a or 16b is provided.
  • FIG. 2 shows an enlarged representation of the holding member 16a, which ensures that the actuating piston 11 is locked in relation to the housing 12 and is arranged in the region of the pressure chamber 13.
  • the holding member 16a comprises a pin 18a, which is integrally connected to a piston 19a, which has a sealing ring 21 on the outside, which is longitudinally displaceable in a bore 20 made in the adjusting piston 11.
  • a compression spring 23a which is inserted between a locking ring 24 and the piston 19a, is used to achieve a radial displacement of the pin 18a into a circulation groove 22 made in the housing 12 when the pressure in the pressure chamber 13 falls below a predetermined value.
  • Another in the piston 1 1 introduced circlip 25a causes a travel limitation of the piston 19a.
  • pressurization of the pressure chamber 13 is required, which likewise pressurizes a piston ring surface 28 and an end face of the pin 18a and thereby triggers a force component that is greater than the corresponding force of the compression spring 23a. This results in a radial displacement of the pin 18a from the circumferential groove 22.
  • This release process ideally already occurs at a pressure which is less than a pressure required to move the actuating piston 1 1 from the end stop 17 in the direction of the camshaft 2.
  • FIG. 3 shows the holding member 16b, in which the pin 18b is arranged in the housing 12 in connection with the piston 19b and the pin 18b is locked in a circumferential groove 26 of the adjusting piston 11 to achieve the locking of the adjusting piston 11.
  • the piston 19b is guided in a blind hole 27 and sealed by means of a sealing ring 29 and experiences an end stop on a locking ring 25b which is inserted in the housing 12.

Landscapes

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

Abstract

L'invention concerne un dispositif destiné à un moteur à combustion interne commandé par des soupapes pour échanges gazeux, qui comprend au moins un arbre à cames (2) disposé dans la culasse et permettant de faire tourner l'arbre à cames par rapport à un pignon d'entraînement (3). Le dispositif (1) comporte un piston d'ajustage (11) pouvant se déplacer entre deux butées, disposé dans un carter (12) et définissant deux chambres de pression (13, 14) enfermées à l'intérieur du carter (12). Les chambres de pression (13, 14) peuvent être reliées alternativement à un flux d'amenée ou d'évacuation du fluide de pression et, quand le moteur est arrêté, le piston d'ajustement (11) se déplace vers une position de base et appuie contre une butée (17). Selon l'invention, le dispositif (1) comprend un élément de retenue (16a, 16b) permettant, dans la phase de démarrage du moteur, d'immobiliser le piston (11) par rapport au carter (12). Une pression peut être exercée sur l'élément de retenue (16a, 16b), disposé dans la chambre de pression (13), de façon à faire passer le piston (11) de sa position de base à la position de fonctionnement désirée.
PCT/EP1996/002834 1995-11-09 1996-06-28 Dispositif d'arret pour piston d'ajustage d'arbre a cames WO1997017529A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19680952D DE19680952D2 (de) 1995-11-09 1996-06-28 Arretierung für einen Kolben einer Nockenwellenverstellung
DE19680952A DE19680952C1 (de) 1995-11-09 1996-06-28 Arretierung für einen Kolben einer Nockenwellenverstellung

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1995141769 DE19541769A1 (de) 1995-11-09 1995-11-09 Arretierung für einen Kolben einer Nockenwellenverstellung
DE19541769.0 1995-11-09

Publications (1)

Publication Number Publication Date
WO1997017529A1 true WO1997017529A1 (fr) 1997-05-15

Family

ID=7777010

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/002834 WO1997017529A1 (fr) 1995-11-09 1996-06-28 Dispositif d'arret pour piston d'ajustage d'arbre a cames

Country Status (2)

Country Link
DE (2) DE19541769A1 (fr)
WO (1) WO1997017529A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850947A1 (de) * 1998-11-05 2000-05-11 Schaeffler Waelzlager Ohg Vorrichtung zur Steuerung der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5979380A (en) * 1996-07-23 1999-11-09 Aisin Seiki Kabushiki Kaisha Valve timing control device
DE19630174C2 (de) * 1996-07-26 1999-10-21 Ford Global Tech Inc Vorrichtung zur Drehwinkelverstellung
DE19716203A1 (de) * 1997-04-18 1998-10-22 Schaeffler Waelzlager Ohg Vorrichtung zum Verändern der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine
JP3760566B2 (ja) * 1997-06-05 2006-03-29 アイシン精機株式会社 弁開閉時期制御装置
DE19723945A1 (de) * 1997-06-06 1998-12-10 Schaeffler Waelzlager Ohg Vorrichtung zum Verändern der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine
DE19724989A1 (de) * 1997-06-13 1998-12-17 Schaeffler Waelzlager Ohg Vorrichtung zum Verändern der Steuerzeiten in einer Brennkraftmaschine
WO1999043930A1 (fr) 1998-02-27 1999-09-02 Bayerische Motoren Werke Aktiengesellschaft Dispositif pour ajuster la trajectoire de mouvement des soupapes d'echange de gaz d'un moteur a combustion interne
DE19820534C2 (de) 1998-05-08 2002-03-28 Porsche Ag Vorrichtung zum Verstellen der relativen Drehlage von Nockenwellen
DE102004038171A1 (de) * 2004-08-06 2006-03-16 Daimlerchrysler Ag Vorrichtung zum Verstellen einer Nockenwelle sowie Verfahren zum Betreiben einer Vorrichtung zum Verstellen einer Nockenwelle
DE102005020529A1 (de) 2005-05-03 2006-11-09 Schaeffler Kg Nockenwellenversteller

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572926A (en) * 1978-11-24 1980-06-02 Hitachi Ltd Scooping tube controlling device for variable-speed hydraulic joint
JPS5967147A (ja) * 1982-10-09 1984-04-16 Sumitomo Electric Ind Ltd アンチスキツド用アクチユエ−タ
US4784037A (en) * 1982-12-28 1988-11-15 The United States Of America As Represented By The United States Department Of Energy Locking apparatus for gate valves
DE4007981A1 (de) * 1989-03-14 1990-10-11 Aisin Seiki Einstellbares ventilsteuerungssystem
DE4417959A1 (de) * 1994-05-21 1995-11-23 Schaeffler Waelzlager Kg Vorrichtung zum Verändern der Steuerzeiten einer Brennkraftmaschine

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5058539A (en) * 1989-09-20 1991-10-22 Atsugi Unisia Corporation Valve timing adjusting system for internal combustion engine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5572926A (en) * 1978-11-24 1980-06-02 Hitachi Ltd Scooping tube controlling device for variable-speed hydraulic joint
JPS5967147A (ja) * 1982-10-09 1984-04-16 Sumitomo Electric Ind Ltd アンチスキツド用アクチユエ−タ
US4784037A (en) * 1982-12-28 1988-11-15 The United States Of America As Represented By The United States Department Of Energy Locking apparatus for gate valves
DE4007981A1 (de) * 1989-03-14 1990-10-11 Aisin Seiki Einstellbares ventilsteuerungssystem
DE4417959A1 (de) * 1994-05-21 1995-11-23 Schaeffler Waelzlager Kg Vorrichtung zum Verändern der Steuerzeiten einer Brennkraftmaschine

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 4, no. 114 (M - 026) 15 August 1980 (1980-08-15) *
PATENT ABSTRACTS OF JAPAN vol. 8, no. 174 (M - 316) 10 August 1984 (1984-08-10) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19850947A1 (de) * 1998-11-05 2000-05-11 Schaeffler Waelzlager Ohg Vorrichtung zur Steuerung der Öffnungs- und Schließzeiten von Gaswechselventilen einer Brennkraftmaschine

Also Published As

Publication number Publication date
DE19680952C1 (de) 1999-12-09
DE19541769A1 (de) 1997-05-15

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