EP0263734B1 - Rocker arm arrangement on an internal-combustion engine cylinder head - Google Patents

Rocker arm arrangement on an internal-combustion engine cylinder head Download PDF

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Publication number
EP0263734B1
EP0263734B1 EP19870402055 EP87402055A EP0263734B1 EP 0263734 B1 EP0263734 B1 EP 0263734B1 EP 19870402055 EP19870402055 EP 19870402055 EP 87402055 A EP87402055 A EP 87402055A EP 0263734 B1 EP0263734 B1 EP 0263734B1
Authority
EP
European Patent Office
Prior art keywords
camshaft
cylinder head
rocker arm
bearing cap
rocker
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
EP19870402055
Other languages
German (de)
French (fr)
Other versions
EP0263734A1 (en
Inventor
Roger Bocquet
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 EP0263734A1 publication Critical patent/EP0263734A1/en
Application granted granted Critical
Publication of EP0263734B1 publication Critical patent/EP0263734B1/en
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
    • F01L1/02—Valve drive
    • F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
    • F01L1/047—Camshafts
    • F01L1/053—Camshafts overhead type
    • 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
    • F01L1/18—Rocking arms or levers
    • F01L1/181—Centre pivot rocking arms

Definitions

  • the invention relates to rocker arm ramps for an internal combustion engine and, more particularly, their arrangement on a cylinder head.
  • a rocker arm ramp comprises an axis carried by at least one support integral with the cylinder head of the engine, this support being either attached and fixed to the cylinder head or made integrally with the latter. Caps can be used to secure the axle to its supports, just as bearing caps are provided to partially delimit the bearings which rotationally support a camshaft, these caps being fixed to the cylinder head by screws or the like.
  • the rocker arms are mounted to oscillate on the axis and are held and guided laterally along this axis by members having guide surfaces perpendicular to said axis. In the prior art, these members may be constituted by the support caps of the rocker arm ramp or by spacers threaded on the axis and if necessary urged by springs. Such an arrangement requires a relatively large number of parts and results in complex assembly and disassembly operations.
  • Document EP-A 0 091 096 describes an arrangement of a rocker arm ramp on an internal combustion engine cylinder head, this cylinder head comprising bearings for a camshaft delimited in part by the cylinder head and in part by at least one cap camshaft bearing fixed on the cylinder head, and supports for the rocker arm ramp, the latter comprising an axis fixed on said supports and rocker arms mounted oscillating around said axis and cooperating with the cams of the camshaft, and rocker guide means, defining guide surfaces perpendicular to said axis, at least one camshaft bearing cap comprising at least one lateral extension delimiting said guide surface.
  • the object of the invention is to provide an arrangement of a rocker arm ramp on an internal combustion engine cylinder head in which the positioning and lateral guidance of the rocker arms on the rocker arm axis is precise and in which the assembly and disassembly operations be facilitated.
  • the subject of the invention is an arrangement of a rocker arm ramp on an internal combustion engine cylinder head, this cylinder head comprising bearings for a camshaft, delimited in part by the cylinder head and in part by at least one camshaft bearing cap fixed on the cylinder head, and supports for the rocker arm ramp, the latter having an axis fixed on said supports, rocker arms mounted oscillating around said axis and cooperating with the cams of the camshaft , and rocker guide means, delimiting guide surfaces perpendicular to said axis, at least one camshaft bearing cap comprising at least one lateral extension delimiting said guide surface, characterized in that said supports for the ramp of rocker arms do not include said camshaft bearing cap and in that the rocker shaft is fixed on at least one support formed in the cylinder head.
  • a rocker rail according to a preferred embodiment of the invention is illustrated in Figs. 1 and 2.
  • a rocker shaft 1 is arranged in a conventional manner parallel to a camshaft 2.
  • Rockers 3 are mounted in an oscillating manner on the axis 1 which is fixed in supports 4a of a cylinder head 4, directly by screws 5 diametrically crossing the axis of rocker arms to be screwed into tapped holes in the cylinder head. In line with these screws, the axis has flats 1 a.
  • the camshaft is rotatably supported in bearings 6, the upper parts of which consist of bearing caps 7 fixed to the cylinder head 4 by screws 8.
  • the bearing caps 7 have, according to the invention, extensions 9 ensuring the positioning and lateral guiding of the rocker arms. These extensions are precisely machined to provide bearing surfaces 10 which cooperate with bearing surfaces 11 formed on the rocker arms in order to determine their lateral position.
  • the caps 7, 7 ′ may include one or more lateral extensions 9 or 9 ′.
  • two rocker arms are arranged to form an assembly trapped between two guide elements, a spring 12 being arranged between their opposite faces, to separate them from one another and apply them against the adjacent guide surfaces.

Description

L'invention concerne les rampes de culbuteurs pour moteur à combustion interne et, plus particulièrement, leur agencement sur une culasse.The invention relates to rocker arm ramps for an internal combustion engine and, more particularly, their arrangement on a cylinder head.

On sait qu'une rampe de culbuteurs comprend un axe porté par au moins un support solidaire de la culasse du moteur, ce support étant soit rapporté et fixé sur la culasse soit venu de matière avec cette dernière. Des chapeaux peuvent être utilisés pour assurer la fixation de l'axe sur ses supports, de même que des chapeaux de paliers sont prévus pour délimiter en partie les paliers qui supportent à rotation un arbre à cames, ces chapeaux étant fixés sur la culasse par des vis ou moyens analogues. Les culbuteurs sont montés oscillants sur l'axe et sont maintenus et guidés latéralement le long de cet axe par des organes comportant des surfaces de guidage perpendiculaires audit axe. Dans la technique antérieure, ces organes peuvent être constitués par les chapeaux de support de la rampe de culbuteurs ou par des entretoises enfilées sur l'axe et les cas échéant sollicitées par des ressorts. Un tel agencement nécessite un nombre de pièces relativement élevé et se traduit par des opérations de montage et de démontage complexes.It is known that a rocker arm ramp comprises an axis carried by at least one support integral with the cylinder head of the engine, this support being either attached and fixed to the cylinder head or made integrally with the latter. Caps can be used to secure the axle to its supports, just as bearing caps are provided to partially delimit the bearings which rotationally support a camshaft, these caps being fixed to the cylinder head by screws or the like. The rocker arms are mounted to oscillate on the axis and are held and guided laterally along this axis by members having guide surfaces perpendicular to said axis. In the prior art, these members may be constituted by the support caps of the rocker arm ramp or by spacers threaded on the axis and if necessary urged by springs. Such an arrangement requires a relatively large number of parts and results in complex assembly and disassembly operations.

Le document EP-A 0 091 096 décrit un agencement d'une rampe de culbuteurs sur une culasse de moteur à combustion interne, cette culasse comportant des paliers pour un arbre à cames délimités en partie par la culasse et en partie par au moins un chapeau de palier d'arbre à cames fixé sur la culasse, et des supports pour la rampe de culbuteurs, cette dernière comportant un axe fixé sur lesdits supports et des culbuteurs montés oscillants autour dudit axe et coopérant avec les cames de l'arbre à cames, et des moyens de guidage des culbuteurs, délimitant des surfaces de guidage perpendiculaires audit axe, au moins un chapeau de palier d'arbre à cames comportant au moins un prolongement latéral délimitant ladite surface de guidage.Document EP-A 0 091 096 describes an arrangement of a rocker arm ramp on an internal combustion engine cylinder head, this cylinder head comprising bearings for a camshaft delimited in part by the cylinder head and in part by at least one cap camshaft bearing fixed on the cylinder head, and supports for the rocker arm ramp, the latter comprising an axis fixed on said supports and rocker arms mounted oscillating around said axis and cooperating with the cams of the camshaft, and rocker guide means, defining guide surfaces perpendicular to said axis, at least one camshaft bearing cap comprising at least one lateral extension delimiting said guide surface.

La réalisation sous forme d'éléments uniques des paliers d'arbre à cames et des moyens de fixation de l'axe des culbuteurs rend les opérations de montage d'un tel ensemble particulièrement complexes et délicates. De plus chacun des éléments formant les supports doubles est d'une réalisation coûteuse notamment du fait des nombreux usinages précis qu'il est nécessaire d'y réaliser.The production in the form of single elements of the camshaft bearings and of the means for fixing the axis of the rocker arms makes the assembly operations of such an assembly particularly complex and delicate. In addition, each of the elements forming the double supports is costly to produce, in particular because of the numerous precise machining operations which it is necessary to carry out.

L'invention a pour but de réaliser un agencement de rampe de culbuteurs sur une culasse de moteur à combustion interne dans lequel le positionnement et le guidage latéral des culbuteurs sur l'axe de culbuteurs soit précis et dans lequel les opérations de montage et de démontage soient facilitées.The object of the invention is to provide an arrangement of a rocker arm ramp on an internal combustion engine cylinder head in which the positioning and lateral guidance of the rocker arms on the rocker arm axis is precise and in which the assembly and disassembly operations be facilitated.

A cet effet l'invention a pour objet un agencement d'une rampe de culbuteurs sur une culasse de moteur à combustion interne, cette culasse comportant des paliers pour un arbre à cames, délimités en partie par la culasse et en partie par au moins un chapeau de palier d'arbre à cames fixé sur la culasse, et des supports pour la rampe de culbuteurs, cette dernière comportant un axe fixé sur lesdits supports, des culbuteurs montés oscillants autour dudit axe et coopérant avec les cames de l'arbre à cames, et des moyens de guidage des culbuteurs, délimitant des surfaces de guidage perpendiculaires audit axe, au moins un chapeau de palier d'arbre à cames comportant au moins un prolongement latéral délimitant ladite surface de guidage, caractérisé en ce que lesdits supports pour la rampe de culbuteurs n'incluent pas ledit chapeau de palier d'arbre à cames et en ce que l'axe de culbuteurs est fixé sur au moins un support ménagé dans la culasse.To this end, the subject of the invention is an arrangement of a rocker arm ramp on an internal combustion engine cylinder head, this cylinder head comprising bearings for a camshaft, delimited in part by the cylinder head and in part by at least one camshaft bearing cap fixed on the cylinder head, and supports for the rocker arm ramp, the latter having an axis fixed on said supports, rocker arms mounted oscillating around said axis and cooperating with the cams of the camshaft , and rocker guide means, delimiting guide surfaces perpendicular to said axis, at least one camshaft bearing cap comprising at least one lateral extension delimiting said guide surface, characterized in that said supports for the ramp of rocker arms do not include said camshaft bearing cap and in that the rocker shaft is fixed on at least one support formed in the cylinder head.

L'invention va être décrite plus en détail ci-dessous en se référant au dessin annexé, donné uniquement à titre d'exemple, et sur lequel:

  • - la Fig. 1 est une vue schématique, partielle, de dessus d'un agencement selon l'invention;
  • - la Fig. 2 est une vue en coupe partielle suivant la ligne II-II de la Fig. 1.
The invention will be described in more detail below with reference to the attached drawing, given solely by way of example, and in which:
  • - Fig. 1 is a schematic partial view from above of an arrangement according to the invention;
  • - Fig. 2 is a partial sectional view along line II-II of FIG. 1.

Une rampe de culbuteurs selon un mode préféré de réalisation de l'invention est illustrée aux Figs. 1 et 2. Un axe de culbuteurs 1 est disposé de façon classique parallèlement à un arbre à cames 2. Des culbuteurs 3 sont montés de façon oscillante sur l'axe 1 qui est fixé dans des supports 4a d'une culasse 4, directement par des vis 5 traversant diamétralement l'axe de culbuteurs pour être vissées dans des trous taraudés dans la culasse. Au droit de ces vis, l'axe comporte des méplats 1 a.A rocker rail according to a preferred embodiment of the invention is illustrated in Figs. 1 and 2. A rocker shaft 1 is arranged in a conventional manner parallel to a camshaft 2. Rockers 3 are mounted in an oscillating manner on the axis 1 which is fixed in supports 4a of a cylinder head 4, directly by screws 5 diametrically crossing the axis of rocker arms to be screwed into tapped holes in the cylinder head. In line with these screws, the axis has flats 1 a.

L'arbre à cames est supporté à rotation dans des paliers 6 dont les parties supérieures sont constituées par des chapeaux de palier 7 fixés à la culasse 4 par de vis 8. Les chapeaux de palier 7 comportent selon l'invention des prolongements 9 assurant le positionnement et le guidage latéral des culbuteurs. Ces prolongements sont usinés avec précision pour ménager des portées 10 qui coopèrent avec des portées 11 ménagées sur les culbuteurs afin de déterminer leur position latérale. Selon qu'ils sont situés à une extrémité ou en un emplacement intermédiaire de l'arbre à cames, les chapeaux 7, 7' peuvent comporter un ou plusieurs prolongements latéraux 9 ou 9'.The camshaft is rotatably supported in bearings 6, the upper parts of which consist of bearing caps 7 fixed to the cylinder head 4 by screws 8. The bearing caps 7 have, according to the invention, extensions 9 ensuring the positioning and lateral guiding of the rocker arms. These extensions are precisely machined to provide bearing surfaces 10 which cooperate with bearing surfaces 11 formed on the rocker arms in order to determine their lateral position. Depending on whether they are located at one end or at an intermediate location of the camshaft, the caps 7, 7 ′ may include one or more lateral extensions 9 or 9 ′.

Comme on le voit sur la Fig. 1, deux culbuteurs sont disposés pour former un ensemble emprisonné entre deux éléments de guidage, un ressort 12 étant disposé entre leurs faces en regard, pour les écarter l'un de l'autre et les appliquer contre les surfaces de guidage adjacentes.As seen in Fig. 1, two rocker arms are arranged to form an assembly trapped between two guide elements, a spring 12 being arranged between their opposite faces, to separate them from one another and apply them against the adjacent guide surfaces.

Les avantages obtenus grâce à un agencement sont les suivants:

  • - le fait d'utiliser des prolongements latéraux des chapeaux de palier de l'arbre à cames comme moyens de guidage des culbuteurs permet de supprimer les chapeaux de support de l'axe portant ces culbuteurs. Le nombre de pièces est ainsi réduit et les opérations de montage s'en trouvent facilitées.
  • - les culbuteurs sont positionnés et guidés de façon plus précise par rapport aux cames avec lesquelles ils coopèrent.
The advantages obtained through an arrangement are as follows:
  • - The fact of using lateral extensions of the bearing caps of the camshaft as means for guiding the rocker arms eliminates the support caps of the axis carrying these rocker arms. The number of parts is thus reduced and assembly operations are thereby facilitated.
  • - The rocker arms are positioned and guided more precisely in relation to the cams with which they cooperate.

Claims (4)

1. Rocker arm arrangement on an internal combustion engine cylinder head (4), the latter having bearings (6) for a camshaft (2), partly defined by the cylinder head (4) and partly by at least one camshaft bearing cap (7) fitted to the cylinder head, together with supports (4a) for the rocker arm system, the latter having a shaft (1) fixed to said supports, rocker arms (3) mounted in oscillating manner about said shaft and cooperating with the cams of the camshaft (2), together with means for guiding (9) the rocker arms (3), defining guide surface (10) perpendicular to said shaft, at least one camshaft bearing cap (7) having at least one lateral extension (9) defining said guide surface (10), characterized is that said supports (4a) for the rocker arm arrangement do not include the camshaft bearing cap (7) and that the shaft of the rocker arms (1) is fixed to at least one support (4a) provided in the cylinder head.
2. Arrangement according to claim 1, characterized in that the rocker arm shaft (1) is fixed directly to support (4a) by screws (5) diametrically passing through the same.
3. Arrangement according to one of the claims 1 or 2, characterized in that an intermediate camshaft (2) bearing cap (7) has two lateral extensions (9), each defining a guide surface (10).
4. Arrangement according to one of the claims 1 or 2, characterized in that the camshaft (2) bearing cap (7) located in the vicinity of the ends of said camshaft have in each case a single extension (9') defining a guide surface (10').
EP19870402055 1986-10-01 1987-09-15 Rocker arm arrangement on an internal-combustion engine cylinder head Expired - Lifetime EP0263734B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8613702A FR2605047B1 (en) 1986-10-01 1986-10-01 ARRANGEMENT OF A ROCKER OF ROCKERS ON A CYLINDER HEAD OF AN INTERNAL COMBUSTION ENGINE.
FR8613702 1986-10-01

Publications (2)

Publication Number Publication Date
EP0263734A1 EP0263734A1 (en) 1988-04-13
EP0263734B1 true EP0263734B1 (en) 1990-04-25

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ID=9339451

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870402055 Expired - Lifetime EP0263734B1 (en) 1986-10-01 1987-09-15 Rocker arm arrangement on an internal-combustion engine cylinder head

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EP (1) EP0263734B1 (en)
DE (1) DE3762443D1 (en)
FR (1) FR2605047B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104806315A (en) * 2015-03-27 2015-07-29 中国北方发动机研究所(天津) Novel positioning mechanism for air feeding rocker arm shaft

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2741691B2 (en) * 1989-04-28 1998-04-22 スズキ株式会社 Valve train of internal combustion engine
USRE35382E (en) * 1989-07-14 1996-11-26 Yamaha Hatsudoki Kabushiki Kaisha Lubrication arrangement for engine
DE4227566A1 (en) * 1992-08-20 1994-03-03 Daimler Benz Ag Camshaft bearing on the cylinder head for a multi-cylinder internal combustion engine
IT1267984B1 (en) * 1994-01-18 1997-02-20 Iveco Fiat ASSEMBLY FOR ASSEMBLY OF A ROCKER AXLE ON A CYLINDER HEAD OF AN ICE ENGINE.

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE339855C (en) * 1919-06-11 1921-08-15 Daimler Motoren Rocker arm control for two or more valves of internal combustion engines
GB170436A (en) * 1920-08-10 1921-10-27 Bentley Motors Ltd Improvements in valve operating mechanism for internal combustion engines
JPS6021445Y2 (en) * 1980-02-14 1985-06-26 日産自動車株式会社 Rocker arm mounting structure
JPS58172409A (en) * 1982-04-02 1983-10-11 Nissan Motor Co Ltd Valve rocker device of internal-combustion engine
JPS5958109A (en) * 1982-09-27 1984-04-03 Honda Motor Co Ltd Cam shaft holder of internal combustion engine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104806315A (en) * 2015-03-27 2015-07-29 中国北方发动机研究所(天津) Novel positioning mechanism for air feeding rocker arm shaft

Also Published As

Publication number Publication date
EP0263734A1 (en) 1988-04-13
DE3762443D1 (en) 1990-05-31
FR2605047B1 (en) 1989-01-27
FR2605047A1 (en) 1988-04-15

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