EP0454518A1 - Betätigungsvorrichtung für zwei aneinandergrenzende Ventile - Google Patents

Betätigungsvorrichtung für zwei aneinandergrenzende Ventile Download PDF

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Publication number
EP0454518A1
EP0454518A1 EP91400883A EP91400883A EP0454518A1 EP 0454518 A1 EP0454518 A1 EP 0454518A1 EP 91400883 A EP91400883 A EP 91400883A EP 91400883 A EP91400883 A EP 91400883A EP 0454518 A1 EP0454518 A1 EP 0454518A1
Authority
EP
European Patent Office
Prior art keywords
pusher
recess
pushers
skirt
face
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.)
Withdrawn
Application number
EP91400883A
Other languages
English (en)
French (fr)
Inventor
Gabriel Laine
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
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 Automobiles Peugeot SA, Automobiles Citroen SA filed Critical Automobiles Peugeot SA
Publication of EP0454518A1 publication Critical patent/EP0454518A1/de
Withdrawn legal-status Critical Current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
    • F01L1/32—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of means for rotating lift valves, e.g. to diminish wear
    • 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
    • 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
    • F01L1/20—Adjusting or compensating clearance
    • F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
    • F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
    • F01L1/245—Hydraulic tappets
    • F01L1/25—Hydraulic tappets between cam and valve stem
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
    • F02B2275/18—DOHC [Double overhead camshaft]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
    • F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F2001/244—Arrangement of valve stems in cylinder heads
    • F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis

Definitions

  • the present invention relates to a device for actuating at least two adjacent valves which are slidably mounted in a cylinder head along two parallel axes and each comprising a valve stem whose end is biased axially, against the force applied to it by a return spring, by a control cam which cooperates with the end face of a valve lifter with sliding skirt in a bore of the cylinder head, the two control cams being carried by a shaft cams whose axis is perpendicular to those of the valves.
  • valve lifters currently used are free to rotate each around its respective axis.
  • the diameter of the cylindrical guide portion of each pusher in its bore must be as large as possible to allow significant valve liftings to be obtained, but it is limited by the distance between the axes of the two valves and by the thickness. of the cylinder head material which separates the two bores between them.
  • the object of the present invention is to make it possible to produce pushers which are as light as possible in order to allow rapid opening of the valves and whose guide diameter is as large as possible. to get large valve lift.
  • the invention provides an actuation device of the type mentioned above, characterized in that it comprises means for stopping the rotation of each pusher about its axis and in that the end face of each pusher is a rectangular contour face whose width is parallel to the axis of the camshaft and less than the diameter of the skirt of the pusher to which it is connected by lateral parts inclined relative to the axis of the pusher.
  • a cylinder head portion 10 of an internal combustion engine in which are formed two guide bores 12 of axes XX which each slide to receive a pusher 14 which is provided to cooperate with the upper end 16 of the rod 18 of a valve.
  • the axes XX common to the pusher 14 and to the valve stems 18 are mutually parallel and contained in a plane perpendicular to the upper face 11 of the portion of cylinder head 10 beyond which the pushers 14 project.
  • Each pusher 14 is made of folded and stamped sheet metal and comprises a cylindrical skirt 20 for guiding the pusher in its bore 12 and an upper end face 22 which is designed to cooperate with a control cam 24.
  • the two cams 24 are carried by a common camshaft 26 whose axis of rotation Y-Y is perpendicular to the axes X-X and is contained in the plane common to these two axes.
  • the cams 24 control the movements of the valve stems 18 by means of the pushers 14 against the return force applied to each of the valves by a return spring 27.
  • the bores 12 for guiding the cylindrical skirts 20 of the pushers 14 are connected together in the central part 28 formed between the two pushers by a recess which is formed by a groove or groove 30 in the cylinder head portion 10.
  • the groove 30 is a groove with sides parallel to the axes X-X and Y-Y which intersects the bores 12 and which extends on either side, to the left and the right by considering FIGS. 1 to 4, of the bores 12.
  • each pusher 14 has a tab 32 folded at 90 ° which projects radially outwards relative to the external cylindrical surface 34 of the skirt 20.
  • the skirt 20 has a vertical groove 38 cut out from the sheet.
  • the rectangular contour of the vertical groove 38 is dimensioned so as to receive in sliding, as shown in Figures 1, 3 and 4, the radial tab 32 of the adjacent pusher.
  • the cooperation of the lug 32 with the axial groove 38 ensures the immobilization in rotation of each of the two pushers 14 around its sliding axis X-X.
  • at least one of the pushers is stopped in rotation by cooperation of a relief of the skirt, such as a tab 32, with the sides of the groove 30.
  • the lug 32 and the groove 38 are received in the central part of the recess 28 between the two bores 12 while the radial lug 32 of the left pusher 14, considering Figures 1, 3 and 4, is received in the part right end of the recess 28, this radial tab of course ensuring no immobilization function in rotation.
  • Each of the pushers 14 being immobilized in rotation about its axis, its upper end face 22 with which the corresponding cam 24 cooperates may be a face with a rectangular contour, the surface of which corresponds to the zone of contact with the cam.
  • each upper face 22 has an added contact plate 40.
  • Each intermediate plate 40 has a substantially rectangular outline whose width "l” is substantially equal to the width of the corresponding cam 24 and whose length "L”, which is perpendicular to the axis YY of the camshaft 26, corresponds to the desired valve lift.
  • the pusher thus designed has a lighter structure compared to conventional plungers thanks in particular to the inclined lateral parts 42 which connect the skirt 20 to the upper end face 22.
  • each pusher 14 is a hydraulic pusher whose hydraulic compensation chamber 44 is supplied with oil under pressure by a conduit 48 formed in the cylinder head portion 10, which opens into the guide bore 12 of the pusher 14 opposite an orifice 50 formed in the skirt 20 of the pusher 14 and which is connected to the lubrication circuit of the engine.
  • the lubrication of the guide of the skirt 20 in its bore 12 is ensured by an oil bath 46 which communicates with the bore by a channel 52 and on the opposite face by the leakage rate the pressurized oil arriving through the conduit 48.
  • the inclined profiles of the parts 42 or 42 ′ of the tappets 14 also make it possible to reduce the volume filled with oil from the chamber 44 and therefore the weight of the tappet in the case of a hydraulic tappet.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
EP91400883A 1990-04-24 1991-03-29 Betätigungsvorrichtung für zwei aneinandergrenzende Ventile Withdrawn EP0454518A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9005221 1990-04-24
FR9005221A FR2661211B1 (fr) 1990-04-24 1990-04-24 Dispositif d'actionnement de deux soupapes voisines.

Publications (1)

Publication Number Publication Date
EP0454518A1 true EP0454518A1 (de) 1991-10-30

Family

ID=9396039

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400883A Withdrawn EP0454518A1 (de) 1990-04-24 1991-03-29 Betätigungsvorrichtung für zwei aneinandergrenzende Ventile

Country Status (2)

Country Link
EP (1) EP0454518A1 (de)
FR (1) FR2661211B1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997028355A1 (de) * 1996-02-03 1997-08-07 INA Wälzlager Schaeffler oHG Stössel für einen ventiltrieb einer brennkraftmaschine
EP1059423A3 (de) * 1999-06-07 2001-03-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Ventiltrieb für eine Verbrennungskraftmaschine
DE19957772A1 (de) * 1999-12-01 2001-06-07 Bayerische Motoren Werke Ag Drehgesicherter Ventilstößel für Ventiltriebe von Brennkraftmaschinen, insbesondere Tassenstößel
DE10123966A1 (de) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Tassenstößel
DE10332981A1 (de) * 2003-07-21 2005-02-10 Bayerische Motoren Werke Ag Ventilströßeleinrichtung, insbesondere drehgesicherter Tassenstößel mit gekrümmter Nockenfolgefläche

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267919A (en) * 1965-06-21 1966-08-23 Gen Motors Corp Tappet anti-rotating device
DE3725458A1 (de) * 1987-07-31 1989-02-09 Bayerische Motoren Werke Ag Steuervorrichtung fuer gaswechsel-ventile einer brennkraftmaschine
DE3806839A1 (de) * 1988-03-03 1989-09-14 Bayerische Motoren Werke Ag Lagegesicherter ventilstoessel, insbesondere fuer brennkraftmaschinen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267919A (en) * 1965-06-21 1966-08-23 Gen Motors Corp Tappet anti-rotating device
DE3725458A1 (de) * 1987-07-31 1989-02-09 Bayerische Motoren Werke Ag Steuervorrichtung fuer gaswechsel-ventile einer brennkraftmaschine
DE3806839A1 (de) * 1988-03-03 1989-09-14 Bayerische Motoren Werke Ag Lagegesicherter ventilstoessel, insbesondere fuer brennkraftmaschinen

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997028355A1 (de) * 1996-02-03 1997-08-07 INA Wälzlager Schaeffler oHG Stössel für einen ventiltrieb einer brennkraftmaschine
US6032631A (en) * 1996-02-03 2000-03-07 Ina Walzlager Schaeffler Ohg Tappet for a valve train of an internal combustion engine
US6119643A (en) * 1996-02-03 2000-09-19 Ina Wlazlager Schaeffler Ohg Tappet for a valve train of an internal combustion engine
EP1059423A3 (de) * 1999-06-07 2001-03-14 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Ventiltrieb für eine Verbrennungskraftmaschine
EP1336725A3 (de) * 1999-06-07 2003-11-12 Mitsubishi Jidosha Kogyo Kabushiki Kaisha Brennkraftmaschine
DE19957772A1 (de) * 1999-12-01 2001-06-07 Bayerische Motoren Werke Ag Drehgesicherter Ventilstößel für Ventiltriebe von Brennkraftmaschinen, insbesondere Tassenstößel
DE10123966A1 (de) * 2001-05-17 2002-11-21 Ina Schaeffler Kg Tassenstößel
DE10332981A1 (de) * 2003-07-21 2005-02-10 Bayerische Motoren Werke Ag Ventilströßeleinrichtung, insbesondere drehgesicherter Tassenstößel mit gekrümmter Nockenfolgefläche
US7146952B2 (en) 2003-07-21 2006-12-12 Bayerische Motoren Werke Aktiengesellschaft Valve tappet system, especially anti-rotation bucket tappet having curved cam follower surface

Also Published As

Publication number Publication date
FR2661211A1 (fr) 1991-10-25
FR2661211B1 (fr) 1992-08-14

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