EP0505231B1 - Hydraulische Steuervorrichtung für Amplitudenveränderliche Hubmechanismen mit mindestens einen Brennkraftmaschinenventil - Google Patents

Hydraulische Steuervorrichtung für Amplitudenveränderliche Hubmechanismen mit mindestens einen Brennkraftmaschinenventil Download PDF

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Publication number
EP0505231B1
EP0505231B1 EP19920400593 EP92400593A EP0505231B1 EP 0505231 B1 EP0505231 B1 EP 0505231B1 EP 19920400593 EP19920400593 EP 19920400593 EP 92400593 A EP92400593 A EP 92400593A EP 0505231 B1 EP0505231 B1 EP 0505231B1
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EP
European Patent Office
Prior art keywords
pivot
support
arm
bore
movable
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
EP19920400593
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English (en)
French (fr)
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EP0505231A1 (de
Inventor
Luc Schwab
Philippe Grocq
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.)
Automobiles Peugeot SA
Automobiles Citroen SA
Original Assignee
Automobiles Peugeot SA
Automobiles Citroen SA
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Publication date
Application filed by Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0505231A1 publication Critical patent/EP0505231A1/de
Application granted granted Critical
Publication of EP0505231B1 publication Critical patent/EP0505231B1/de
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
    • F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
    • F01L1/267—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder with means for varying the timing or the lift of the 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
    • 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
    • F01L13/0036—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 the valves being driven by two or more cams with different shape, size or timing or a single cam profiled in axial and radial direction

Definitions

  • the present invention relates to a valve lifting mechanism with amplitude or variable opening law, for example for an internal combustion engine, and relates more particularly to a hydraulic control device for such a mechanism.
  • a valve lifting mechanism has more particularly been described in which at least one latch, articulated on at least one pivot and displaceable by means of a cam, causes the valve lifting when it moves, at least a pivot being fixed and a pivot being mobile, under the effect of the control device between two positions called active and rest respectively, the valve being alternately actuated by a latch articulated on a fixed pivot according to the so-called rest position of the movable pivot and by a latch articulated on the movable pivot according to its active position, so as to vary the amplitude of the lifting by changing the position of the movable pivot.
  • control devices comprise a control shaft on which are provided cams whose rotation causes the displacement of the movable pivot between its rest position and its active position.
  • document EP-A-405 927 describes a device corresponding to the preamble of claim 1, with at least two catches.
  • the object of the invention is to propose a new control device for a valve lifting mechanism by means of which it is possible to reduce the number and the mass of the moving parts, as well as to obtain a greater amplitude variation of the valve lift.
  • the subject of the invention is a device for controlling the lifting mechanism of at least one valve in which at least two catches, each of which is articulated on a pivot and cooperates with a cam to cause the valve to be lifted, at at least one pivot being mobile under the effect of the device between two respectively active and rest positions, characterized in that, the valve being alternately actuated by a latch articulated on a fixed pivot according to the rest position of the movable pivot and by a latch articulated on the movable pivot according to its so-called active position, so as to vary the amplitude of the lift by changing the position of the movable pivot, the movable pivot is secured to a sliding support in a fixed body, a locking finger mounted sliding in a transverse bore of the support coming into the active position with regard to a bore of the same diameter formed in the fixed body and a sliding piston housed in the bore of the fixed body that can be pushed hydraulically to move the finger until it engages in the bore of the fixed body, thereby locking the support in the active position
  • an elastic member is housed in the bore of the fixed body, and exerts on the finger in the active position a force opposite to the pushing of the piston, so that at the interruption of the pushing, the finger and the piston are returned to a position which allows the support of the movable pivot to slide.
  • each latch is constantly kept in contact with its respective cam by means of return members.
  • one of the abovementioned return means consists of at least one spring disposed between the fixed body and the sliding support so as to urge the latch articulated on the movable pivot against the corresponding cam.
  • At least one of the return members is constituted by a spring fixed on the one hand to the pawl and on the other hand to a fixed part for pressing the pawl against the corresponding cam.
  • the device comprises means for adjusting the clearance of each latch.
  • the adjustment means consist of pellets of appropriate thickness, arranged between the latch and a valve and by locknuts respectively mounted on the threaded rod of each of the fixed pivots.
  • pivot pins of the latches are mounted on the fixed body, the movable pivot being constituted by a shaft with an axis substantially parallel to the above-mentioned bores and housed in a boss integrated in the sliding support.
  • recesses are formed on at least one moving part such as the sliding support and the latches.
  • Figure 1 is a sectional view along a plane perpendicular to the camshaft, of an internal combustion engine cylinder head equipped with the valve lift amplitude variation control device according to the invention.
  • FIG. 2 is a partial and simplified view according to arrow II in FIG. 1.
  • FIG. 3 is a view similar to FIG. 1, in section along the line III-III of FIG. 2.
  • Figure 4 is a schematic perspective view of a lifting mechanism of two valves, equipped with the device according to the invention and shown with the movable pivot in the rest position.
  • Figure 5 is a partial section along the line V-V of Figure 2, with the support of the movable pivot in the rest position.
  • Figure 6 is a view similar to Figure 4 with the movable pivot in the active position.
  • Figure 7 is a view similar to Figure 5 with the movable pivot support in the active position.
  • a cylinder head 1 of an internal combustion engine comprises a duct 100, for example of intake or exhaust.
  • a valve 2 is slidably mounted in a guide barrel 3 fixed on the cylinder head 1.
  • a cup 4 is fixed on the rod 2a of the valve 2 and a spring helical 6 is mounted between the cylinder head 1 and this cup 4 so as to permanently urge the valve 2 towards its closed position of the conduit 100, that is to say with its head 2c in sealed support against a valve seat 110 of cylinder head 1.
  • FIG. 4 There is shown in Figures 4 and 6 a variable amplitude lifting mechanism which acts on two valves 2.
  • the lifting mechanism consists of three lugs mounted pivoting relative to the cylinder head 1, and three cams integral with the same tree designated in 7.
  • Two straight lugs F are respectively mounted on pivots 13 and 14 fixed relative to the cylinder head 1. Each straight latch F is moved using a low profile cam B, during the rotation of the shaft 7.
  • a T-shaped central latch M is articulated on a pivot 15 movable relative to the cylinder head 1, and cooperates with a high profile cam H.
  • the central latch M comprises a longitudinal part 35 which extends parallel to the lugs F and a transverse part 10 on which the latches F come to bear.
  • a control device which will be described later makes it possible to move the movable pivot 15 between a so-called rest position (FIG. 4) and an active position (FIG. 6).
  • valves 2 are alternately actuated by the lugs F under the effect of the low cams B- and by means of the transverse part 10 of the latch M- when the movable pivot is in the rest position , and by the latch M under the effect of the high cam H when the movable pivot is in the active position. It is thus possible to vary the amplitude of the lifting of the valves 2 by changing the position of the movable pivot 15.
  • the device according to the invention can be applied to most of the prior art variable valve lift mechanisms, and in particular to those described in the patent applications cited above.
  • the content of these requests is integrated here by the reference therein, in order to simplify the description.
  • the movable pivot 15 is mounted on a sliding support 50 which is itself housed in a guide groove 52 formed in a fixed body 51 and substantially orthogonal to the shaft 7.
  • the fixed body 51 is immobilized on the cylinder head 1 using fixing screws V, such as that which is visible in FIG. 1.
  • a locking finger 60 is slidably mounted in a transverse bore 56 of the support 50.
  • the transverse bore 56 comes to view a bore 66 of identical diameter formed in the fixed body 51.
  • the bores 56 and 66 constitute a cylindrical recess passing right through the sliding support 50 and the fixed body 51.
  • This cylindrical recess 56, 66 s extends in a direction substantially parallel to the axis of the camshaft 7.
  • a sliding piston 61 is housed in the part of the bore 66 of the fixed body 51 which is located in line with the fixed pivot 14.
  • a pipe formed in the cylinder head 1 has been designated by the reference 40, which is connected to the cylindrical bore 66 via a pipe 41 produced by drilling in the fixed body 51. It can be seen in FIG. 1 that an O-ring 43 is disposed between the pipe 40 and the pipe 41 to seal between the cylinder head 1 and the fixed body 51.
  • the pipes 40, 41 allow the connection of the bore 66 to a source of pressurized fluid such as oil.
  • the reference 63 designates in FIGS. 5 and 7 a plate which is fixed to the fixed body 51 so as to close off the end of the bore 66 where the pipe 41 opens out.
  • This plate 63 comprises a pin 64 projecting into the bore 66 and acting as a stop for the piston 61 when the support 50 is in the rest position of the movable pivot 15, shown in FIG. 5.
  • the stop pin 64 makes it possible to prevent the piston 61 from closing off the pipe 41
  • the locking finger 60 has a length identical to the width of the sliding support 50.
  • the support 50 can freely slide from bottom to top, as shown by the arrows C in FIGS. 4 and 5.
  • a hydraulic thrust moves the piston 61 and the d locking pin 60 to the left.
  • the mounting of the piston 61 in the bore 66 must be carried out in a sealed manner.
  • the finger 60 is engaged in the bore 66 and the piston 61 protrudes into the bore 56 of the sliding support 50. This gives a symmetrical locking of the support 50 which ensures good distribution of forces due to the action of the cam H on the latch M.
  • the reference numeral 55 designates an elastic member.
  • the elastic member 55 is constituted by a helical spring housed in the part of the bore 66 which is opposite the piston 61.
  • This elastic member 55 is disposed between a cylindrical pad 53 and a perforated washer 54.
  • the perforated washer 54 is fixed in the bore 66 while the cylindrical pad 53 is slidably mounted therein.
  • a guide rod 58 is fixed to the cylindrical pad 53 and extends coaxially to the bore 66 so as to pass through the opening of the perforated washer 54.
  • Each latch F and M is constantly maintained in contact with its respective cam B, H, by means of return members, which will now be described.
  • the straight tabs F are kept in contact with the cams B using tension springs 70 and 71.
  • the springs 70 and 71 are fixed on the one hand to the free end of each tab F and on the other hand to a fixed part secured to the cylinder head 1. More precisely, the upper ends of the springs 70 and 71 are hooked to a rod 72 each end of which is fixed to the cylinder head 1.
  • the lower ends of the springs 70 and 71 are respectively hooked to lugs 70f and 71f.
  • the 70f hooking lug is integrated into the latch F which is articulated on the fixed pivot 14, while the tab 71f is integrated into the latch F which is articulated on the fixed pivot 13.
  • each latch F is constantly stressed in the direction of the arrows D visible in FIG. 6, to press against the corresponding cam B.
  • the catch M which is articulated on the movable pivot 15 is constantly kept in contact against the cam H by means of return means constituted by helical springs 73 and 74, arranged between the support 50 and the fixed body 51.
  • the support 50 has substantially the shape of a T.
  • the part corresponding to the vertical bar of the T is slidably housed in the guide groove 52 of the fixed body 51.
  • the part corresponding to the transverse bar of the T is constituted by two support legs 59 perpendicular to the groove 52.
  • the spring forming return means 73 is housed in a bore in the body 51 and projects from the upper face of the latter so as to come into abutment against the leg 59 which is in line with part 35 of the latch M.
  • the spring 74 is housed in another bore of the fixed body 51 and bears by its upper end against the other tab 59 of the support 50. Thanks to this mounting, the springs orts 73 and 74 exert on the legs 59 of the support 50 a force oriented in the direction of the arrows C in FIG. 4, which urges the latch M against the corresponding cam H, by means of the movable pivot 15.
  • the pivot 15 is constituted by a shaft whose axis is substantially parallel to the axis 7 and to the bores 56,66. This shaft 15 is housed in a boss integrated into the support 50 and projecting from the latter between the tabs 59 described above.
  • the locknuts 16 and 17 are mounted on the threaded rod by which the fixed pivots 13 and 14 are fixed on the body 51, and bear when tightened against the upper face of the fixed body 51. As shown in the figure 1, the adjustment of the clearance of the latches is also obtained by interposing pads 76 of appropriate thickness between the valve stem 2a and the transverse part 10 of the latches M.
  • the sliding support 50 is unlocked by the spring 55, and as soon as the nose of the cam H comes into contact with the latch M, the movable pivot 15 and the sliding support 50 move as indicated in C in FIG. 5. Consequently, it is the low profile cams B which act on the catches F and cause via the transverse part 10 of the catcher M which is deactivated, a lifting of the valves whose amplitude is reduced. In other words, while the low profile cams B move the catches F and cause the valves 2 to lift, the high profile cam H exerts on the catcher M an effort which has the sole effect of sliding the support 50 against the stress exerted by the springs 73, 74.
  • the respective profiles of cams B and H provide, in addition to or instead of different amplitudes, different durations of valve lift, so that the law of opening thereof varies according to whether the movable pivot is in active position or in rest position.
  • a control device for a valve lifting mechanism has been produced, by means of which it is possible, compared with prior devices, to reduce the number and mass of the moving parts, as well as to obtain a greater variation in duration or amplitude of the valve lift.
  • the device according to the invention can also allow the lifting of a single valve, and that the lifting mechanism can comprise a number of catches other than three.

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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 (9)

  1. Vorrichtung zur Steuerung eines Hubmechanismus wenigstens eines Ventils, bei welcher wenigstens zwei Hebel, von denen jeder an einem Zapfen angelenkt ist und mit einem Nocken zusammenwirkt, um den Hub des Ventils zu verursachen, wobei wenigstens ein Zapfen unter der Wirkung der Vorrichtung zwischen einer wirksamen und einer Ruhestellung bewegbar ist, dadurch gekennzeichnet, dass, während das Ventil abwechselnd durch einen an einem ortsfesten Zapfen angelenkten Hebel (F) gemäss der Ruhelage des bewegbaren Zapfens und durch einen an dem bewegbaren Zapfen (15) angelenkten Hebel (M) gemäss seiner sogenannten wirksamen Stellung betätigt wird, um die Hubamplitude durch Änderung der Stellung des bewegbaren Zapfens (15) zu verändern, der bewegbare Zapfen (15) mit einem in einem ortsfesten Körper (51) gleitenden Halter (50) fest verbunden ist, wobei ein gleitbar in einer Querbohrung (56) des Halters (50) angeordneter Verriegelungsfinger (60) in wirksamer Stellung gegenüber einer in einem ortsfesten Körper (51) gebildeten Bohrung (66) mit gleichem Durchmesser zu liegen kommt und ein in der Bohrung (66) des ortsfesten Körpers untergebrachter gleitender Kolben (61) hydraulisch geschoben werden kann, um den Finger (60) bis zu seinem Einstecken in der Bohrung (66) des ortsfesten Körpers zu verschieben, indem somit der Halter (50) in der wirksamen Stellung des Zapfens (15) verriegelt wird.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass ein elastisches Glied (55) in der Bohrung (66) des ortsfesten Körpers (51) untergebracht ist und auf den Finger (60) in wirksamer Stellung eine dem Schub des Kolbens (61) entgegengesetzte Kraft ausübt, sodass bei Unterbrechung des Schubes, der Finger (60) und der Kolben (61) in eine Stellung, die es dem Halter (50) des bewegbaren Zapfens (15) gestattet, zu gleiten, rückgestellt werden.
  3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass jeder Arm (F,M) stetig in Berührung mit seinem jeweiligen Nocken (B,H) dank Rückstellglieder (70, 71, 73, 74) gehalten wird.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass eines der vorgenannten Rückstellmittel durch wenigstens eine zwischen dem ortsfesten Körper (51) und dem gleitenden Halter (50) gefügte Feder (73, 74) gebildet wird, um den an dem bewegbaren Zapfen (15) angelenkten Arm (M) entgegen des entsprechenden Nockens (H) zu beaufschlagen.
  5. Vorrichtung nach einem der Ansprüche 3 oder 4, dadurch gekennzeichnet, dass wenigstens eines der Rückstellglieder durch eine einerseits an dem Arm (F) und andererseits an einem ortsfesten Teil (72) befestigte Feder (70, 71) gebildet wird, um den Arm (F) an den entsprechenden Nocken (B) anzudrücken.
  6. Vorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sie Mittel (16, 17, 76) zum Einstellen des Spieles jedes Armes (M,F) umfasst.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Einstellmittel durch zwischen dem Arm (M) und einem Ventil (2) angeordnete Scheibchen (76) geeigneter Dicke und durch jeweils an dem Gewindeschaft jedes der ortsfesten Zapfen (13, 14) angeordnete Gegenmuttern (16, 17) gebildet werden.
  8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass die Anlenkzapfen (13, 14) der Arme (F) an dem ortsfesten Körper (51) angeordnet sind, wobei der bewegbare Zapfen (15) durch eine Welle gebildet wird, dessen Achse etwa parallel zu den vorgenannten Bohrungen (56, 66) und in einem dem gleitenden Halter (50) einverleibten Höcker untergebracht ist.
  9. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass Aussparungen (E) an wenigstens einem beweglichen Teil, wie dem gleitenden Halter (50) und den Armen (F,M) gebildet sind.
EP19920400593 1991-03-19 1992-03-06 Hydraulische Steuervorrichtung für Amplitudenveränderliche Hubmechanismen mit mindestens einen Brennkraftmaschinenventil Expired - Lifetime EP0505231B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9103335A FR2674287B1 (fr) 1991-03-19 1991-03-19 Commande hydraulique pour mecanisme de levee a amplitude variable d'au moins une soupape de moteur a combustion interne.
FR9103335 1991-03-19

Publications (2)

Publication Number Publication Date
EP0505231A1 EP0505231A1 (de) 1992-09-23
EP0505231B1 true EP0505231B1 (de) 1994-07-13

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EP19920400593 Expired - Lifetime EP0505231B1 (de) 1991-03-19 1992-03-06 Hydraulische Steuervorrichtung für Amplitudenveränderliche Hubmechanismen mit mindestens einen Brennkraftmaschinenventil

Country Status (4)

Country Link
EP (1) EP0505231B1 (de)
JP (1) JPH0586822A (de)
DE (1) DE69200235T2 (de)
FR (1) FR2674287B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952909B4 (de) * 1999-11-03 2010-06-24 Schaeffler Kg Schaltbares Abstützelement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4212844A1 (de) * 1992-04-16 1993-10-21 Audi Ag Ventilbetätigungsmechanismus für eine Brennkraftmaschine
FR2815377B1 (fr) 2000-10-13 2003-02-07 Peugeot Citroen Automobiles Sa Dispositif de commande de distribution a soupapes, a configurations multiples
DE10122373B4 (de) * 2001-05-09 2014-09-18 Schaeffler Technologies Gmbh & Co. Kg Schaltbares Abstützelement
DE102006026017A1 (de) 2006-06-01 2007-12-06 Mahle International Gmbh Einrichtung zum Abschalten zumindest eines Zylinders eines Verbrennungsmotors
DE102009037496A1 (de) * 2009-08-13 2011-02-17 Schaeffler Technologies Gmbh & Co. Kg Ventiltrieb einer Brennkraftmaschine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4475489A (en) * 1981-05-27 1984-10-09 Honda Giken Kogyo Kabushiki Kaisha Variable valve timing device for an internal combustion engine
JPS60243310A (ja) * 1984-05-18 1985-12-03 Suzuki Motor Co Ltd ４サイクルエンジンの吸排気弁の開き量可変装置
US4768467A (en) * 1986-01-23 1988-09-06 Fuji Jukogyo Kabushiki Kaisha Valve operating system for an automotive engine
JP2700692B2 (ja) * 1989-06-30 1998-01-21 スズキ株式会社 ４サイクルエンジンの動弁装置
FR2663078B1 (fr) * 1990-06-06 1994-10-07 Peugeot Dispositif a linguet et a amplitude variable pour la levee d'une soupape de moteur a combustion interne.
FR2663682B1 (fr) * 1990-06-21 1992-10-16 Peugeot Dispositif a amplitude variable pour la levee d'au moins une soupape de moteur a combustion interne.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19952909B4 (de) * 1999-11-03 2010-06-24 Schaeffler Kg Schaltbares Abstützelement

Also Published As

Publication number Publication date
DE69200235D1 (de) 1994-08-18
DE69200235T2 (de) 1995-03-02
JPH0586822A (ja) 1993-04-06
FR2674287A1 (fr) 1992-09-25
EP0505231A1 (de) 1992-09-23
FR2674287B1 (fr) 1993-07-23

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