WO2015107292A1 - Tubular camshaft forming centrifugal oil filter - Google Patents

Tubular camshaft forming centrifugal oil filter Download PDF

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Publication number
WO2015107292A1
WO2015107292A1 PCT/FR2015/050065 FR2015050065W WO2015107292A1 WO 2015107292 A1 WO2015107292 A1 WO 2015107292A1 FR 2015050065 W FR2015050065 W FR 2015050065W WO 2015107292 A1 WO2015107292 A1 WO 2015107292A1
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WO
WIPO (PCT)
Prior art keywords
bore
diameter
shaft
camshaft
oil
Prior art date
Application number
PCT/FR2015/050065
Other languages
French (fr)
Inventor
Frédéric JUSTET
Original Assignee
Renault S.A.S
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 Renault S.A.S filed Critical Renault S.A.S
Priority to EP15704041.1A priority Critical patent/EP3094835B1/en
Publication of WO2015107292A1 publication Critical patent/WO2015107292A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • F01M9/10—Lubrication of valve gear or auxiliaries
    • F01M9/105—Lubrication of valve gear or auxiliaries using distribution conduits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M9/00—Lubrication means having pertinent characteristics not provided for in, or of interest apart from, groups F01M1/00 - F01M7/00
    • 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
    • F01L2001/0475—Hollow 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
    • F01L2810/00—Arrangements solving specific problems in relation with valve gears
    • F01L2810/02—Lubrication
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0422—Separating oil and gas with a centrifuge device

Definitions

  • the invention relates to a tubular shaft for a motor vehicle engine, which comprises at least one oil circulation bore of a first determined diameter, supplied with oil at a first end via an orifice. and extending substantially along the length of said shaft, and which comprises a plurality of radial ducts which are distributed along the length of the shaft, which pass through a tubular wall of the shaft, and which put in communication the inside the bore with the outside of the shaft.
  • camshafts of this type are known.
  • Such a camshaft conventionally has no filtration device. To filter the engine oil, it is necessary to filter the oil upstream of the camshaft.
  • the different radial ducts can also be connected to various engine components to allow the lubrication of said members.
  • the oil flow must be ensured by all the radial ducts.
  • the invention proposes an alternative engine oil filtration device that takes advantage of the rotational movement of the camshaft during operation of the engine to filter impurities suspended in the engine oil with the aid of a well-known phenomenon of centrifugation and lubricate engine components connected to different radial ducts.
  • the oil tends to exit through the outlet ports closest to the feed inlet, which can lead to a lack of lubrication of the connected members with the outlets farthest from the inlet port of the inlet. 'food.
  • the diameters of the outlet orifices are therefore very small, of the order of 0.4 mm and in particular the diameters of the orifices closest to the oil supply orifice, which increases the difficulty of producing a such camshaft.
  • the invention provides a camshaft of the type described above forming a centrifugal oil filter and capable of discharging oil uniformly by all the discharge orifices, said camshaft being inexpensive in manufacturing.
  • uniform evacuation of the oil means that the device simultaneously allows the passage of oil through all the ports at a time.
  • the invention proposes a camshaft of the type described above, characterized in that the bore is closed at a second end opposite the first end and in that the bore is provided with a retaining means. oil which, during rotation of the shaft (10), allows the uniform discharge of the oil by centrifugation by the radial ducts beyond an oil level threshold.
  • the retaining means comprises a reservoir adapted to allow the retention of impurities in the bore.
  • the oil discharge orifices have different diameters from one another.
  • the diameters of the oil discharge holes are in the range between 1 and 5mm.
  • an inlet end (28) which is arranged according to a second diameter (D28) smaller than the first diameter (D12), to allow, during the rotation of the shaft (10), to form a weir for the discharge of the oil.
  • the camshaft comprises a plurality of holes which are distributed along the length of the shaft, which pass through the tubular wall of the shaft, and which each receive an attached tube whose inlet end is arranged according to the second diameter smaller than the first diameter,
  • the camshaft comprises a plurality of internal bosses which project inside the bore, which each comprise a bore passing through the tubular wall of the shaft whose inlet end is arranged according to the second diameter; less than the first diameter,
  • the second end of the camshaft has a bore closed by a removable plug.
  • the invention also relates to a method for cleaning a tubular camshaft for a motor vehicle engine having an oil circulation bore of a first determined diameter having at a first end a feed orifice in a preferential manner. coaxial and at a second end a hole closed by a stopper, and a plurality of radial ducts distributed along the length of the shaft which pass through a tubular wall of the shaft and whose ends are arranged according to a second diameter smaller than the first diameter , characterized in that it comprises at least a first step during which the cap is removed, a second step during which the interior of the bore is cleaned, in particular using compressed air or a solvent and a third step during which the plug is replaced.
  • the invention also relates to a tool for manufacturing a tubular camshaft for a motor vehicle engine of the type described above, comprising an oil circulation bore of a first determined diameter having at one end an orifice power supply coaxially preferential manner and at a second end a hole closed by a plug, a plurality of radial bores distributed along the length of the shaft which pass through a tubular wall of the shaft, and a plurality of radial tubes distributed along the length of the which are received in the bores and whose ends are arranged in a second diameter smaller than the first diameter, characterized in that it comprises:
  • a biasing element for pushing at least one tube in a corresponding radial bore to a stop position against the stop member.
  • the biasing element comprises at least one body from which extends a tooth of a cylindrical section of a diameter corresponding to the inside diameter of a tube and of a length greater than that of said tube, able to allow said tooth receives a tube and has a free end protruding from the tube, and the abutment member has at least one bore of a diameter corresponding to the diameter of the free end of a tooth, the element biasing being able to push the tube in a hole of the cam shaft, the tooth being adapted to be received in a bore facing the abutment member and the tube being adapted to be squeezed by crushing between the element of solicitation and the stop element,
  • the stop element comprises a comb comprising as many teeth as the camshaft has bores, each tooth being of a cylindrical section of a diameter corresponding to the inside diameter of a tube and of a length greater than that of said tube adapted to allow said tooth to receive a tube and to have a free end projecting out of the tube, and the stop element has as many holes as the camshaft has holes, each piercing being a diameter corresponding to the diameter of the free end of a tooth of the comb, the comb being able to push the tubes into the bores of the cam shaft, the teeth of the comb being able to be received in the abutment element and the tubes being able to be crimped by crushing between the comb and the abutment element.
  • the invention also generally relates to a method of manufacturing a tubular camshaft of the type described above comprising an oil circulation bore of a first determined diameter having at a first end a feed orifice and at a second end a hole closed by a plug, a plurality of radial bores distributed along the length of the shaft which pass through a tubular wall of the shaft, and a plurality of radial tubes distributed along the length of the shaft which are received in the bores and whose ends are arranged according to a second diameter smaller than the first diameter, using a tool of the type described above, characterized in that it comprises:
  • a third crimping step during which the tubes are pushed by a biasing element in the holes until they are crushed against the stop element to be crimped into the camshaft.
  • FIG. 1 is a schematic sectional view of a camshaft according to a prior art
  • - Figure 2 is a schematic sectional view of a camshaft according to the invention
  • FIG. 3 is an exploded perspective view of a camshaft according to the invention and a tool for the manufacture of said camshaft;
  • FIG. 4 is an assembled perspective view of a camshaft according to the invention and a tool for the manufacture of said camshaft;
  • FIG. 5 is an overall sectional view showing second and third stages of a method of manufacturing the camshaft for an engine according to the invention
  • FIG. 6 is a detailed sectional view showing the third step of the manufacturing process of the cylinder head for an engine according to the invention.
  • FIG. 1 shows a tubular camshaft 10 for a motor vehicle engine engine produced according to a state of the art.
  • the shaft 10 comprises at least one bore 12 of oil circulation of a first diameter "D12" determined, which is supplied with oil at a first end 14 of the shaft 10 via a preferably coaxial feed port 16 through which oil is injected into the shaft 10.
  • the oil flow "H” has been represented by arrows in FIGS. 1 and 2.
  • a convergent 17 may be arranged at the inlet of the orifice 16 to channel the flow of oil "H" towards the bore 12.
  • the bore 12 extends substantially along the length of the shaft 10.
  • the shaft 10 comprises a plurality of radial ducts 18 which are distributed along the length of the shaft 10, which pass through a tubular wall 20 of the shaft 10, and which put the interior of the bore 12 into communication with the outside of the shaft 10.
  • a conventional solution is to filter the oil upstream of the camshaft 10, but this solution remains expensive.
  • the invention proposes to take advantage of the rotational movement of the camshaft 10 to provide a camshaft whose oil is filtered by centrifugation.
  • the invention provides a camshaft 10 of the type described above characterized in that the bore 10 is closed at a second end 26 opposite the first end 14 and in that each radial duct 18 has inside the bore 12 an inlet end 28 which is arranged according to a second diameter "D 2 8" smaller than the first diameter "D12", to allow, during the rotation of the shaft 10, to form a weir capable of allowing the evacuation of the oil "H” by centrifugation and the retention of impurities in the bore 12.
  • the rotation of the shaft 10 makes it possible to subject the impurities 22 to a centrifugal force which plates them against the inner wall 20 of the bore 12.
  • This wall arranged according to the diameter "D12" is arranged behind the end 28 of the ducts 18, so that the impurities 24 can not enter the ducts 18.
  • the bore 12 of the shaft 10 fills with oil "H” until the level of the oil film on the inner wall of the bore 12 reaches the diameter "D 28 ".
  • the surplus oil “H” is then discharged through the ducts 18 while the impurities 24 are confined against the inner wall of the bore 12.
  • the diameters of said discharge holes may be independent of one another: the oil "H" surplus beyond the threshold defined by the differences between the diameter of the inner wall of the bore and the second diameter "D28", passes over the inlet end 28 of the ducts to be uniformly discharged and lubricate the organs connected to said ducts. It is not necessary either to opt for very small diameters of the discharge holes, nor to make diameters dependent on one another to regulate the evacuation of the oil.
  • any embodiment of the ducts 18 adapted to provide an end 28 of the ducts 18 arranged according to the diameter "D 2 8" may be suitable for the proper implementation of the invention.
  • camshaft 10 could, as illustrated in FIG. 2, have a plurality of internal bosses 30 that project inside the bore 12, each having a bore 32 passing through the tubular wall 20 of the housing. shaft to form the ducts 18 and of which the inlet end 28 is arranged in the second diameter "D 2 8" than the first diameter "Dis”.
  • the camshaft 10 has a plurality of holes 32 which are distributed along the length of the shaft 10, which pass through the tubular wall 10 of the tree, and which each receive a tube 34 reported which the inlet end 28 is arranged in the second diameter "D 2 8" than the first diameter "Dis”.
  • any means for closing the bore 12 may be suitable for the implementation of the invention.
  • the bore 12 could be blind.
  • the second end 26 of the camshaft comprises a bore 36 closed by a removable cap 38, as shown in Figure 2.
  • the bore 36 can be confused with the diameter of the bore 12.
  • This configuration makes it possible to determine a method of cleaning such a tubular camshaft 10 in order to eliminate the impurities that would have been deposited therein.
  • this cleaning method comprises at least a first step during which the stopper 38 is removed, a second step during which the interior of the bore 12 is cleaned, and a third step during of which we replace the cap 38.
  • a shaft 10 comprising ducts 18 constituted in part by tubes 34 requires a crimping of the tubes 34 in the holes 32 to ensure that the end 28 of said tubes 34 is well arranged according to the diameter "D 2 8" -
  • such a method comprises a first step of introducing an abutment element 40 inside the bore 12, then a second step of introducing the tubes 34 in the holes 32 externally to the camshaft 10, and finally a third crimping step during which the tubes 34 are repulsed by an element 42 in the holes 32 to be crushed against the stop member 40 to be crimped in the camshaft 10.
  • This tool comprises, as has been seen, a stop element 40 intended to be inserted inside the bore 12 and a biasing element 42 intended to push at least one tube 34 into a corresponding radial bore 32 up to a stop position against the abutment member 40.
  • the biasing element 42 comprises at least one body 44 from which extends a tooth 46 of a cylindrical section with a diameter corresponding to the inside diameter of a tube 34 and a length greater than that of said tube 34, adapted to allow said tooth 46 to receive a tube 34 and to have a free end 48 projecting out of the tube, as shown more particularly in Figure 6.
  • the stop element 40 comprises at least one hole 50 of a diameter corresponding to the diameter of the free end of a tooth 46,
  • the biasing element 42 can push the tube 34 into a hole 32 of the cam shaft, then the tooth 46 is in a hole 50 of the abutment member 40 arranged opposite the bore 32. In FIG. continuing the bias, the tube 34 is crimped between the biasing element 42 and the abutment member 40.
  • the tooling could make it possible to carry out in one pass all the crimps of the camshaft 10.
  • the biasing element could comprise a comb comprising as many teeth 46 as the camshaft has holes 32, each tooth 46 being of a cylindrical section of a diameter corresponding to the internal diameter of a tube 34 and of a length greater than that of said tube 34 adapted to allow said tooth 46 to receive a tube 46 and to have a free end 48 projecting from the tube 34.
  • the stop element 40 would then have as many holes 50 as the camshaft 10 has holes 32, each hole 50 being of a diameter corresponding to the diameter of the free end 48 of a tooth 46 of the comb.
  • the comb would be able to simultaneously push all the tubes 34 in the holes 32 of the camshaft 10, then the teeth 48 of the comb would be received in the abutment member 40 and the tubes 34 would be crimped between the comb and the abutment member 40.
  • the invention thus makes it possible to propose a camshaft 10 forming a centrifugal oil filter and a method of simple and economical manufacture of said camshaft 10.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)

Abstract

The invention proposes a tubular camshaft (10) for a motor vehicle combustion engine, which camshaft comprises at least an oil-circulation bore (12) of a determined first diameter (D12), supplied with oil (H) at a first end (14) via a coaxial supply orifice (16) and extending substantially along the length of said shaft (10), and which comprises a plurality of radial ducts (18) which are distributed along the length of the shaft (10), which pass through a tubular wall (20) of the shaft (10), and which place the inside of the bore (12) in communication with the outside of the shaft (10), characterized in that the bore (12) is closed at a second end (26) the opposite end to the first end (14) and in that each radial duct (18) comprises, inside the bore (12), an inlet end (28) which is arranged at a second diameter (D28) smaller than the first diameter (D12) so as, as the shaft (10) rotates, to form a spillway able to allow oil (H) to be discharged by centrifugal spinning and impurities (24) to be held within the bore (12).

Description

ARBRE A CAMES TUBULAIRE FORMANT FILTRE A HUILE  TUBULAR CAM SHAFT FORMING OIL FILTER
CENTRIFUGE  CENTRIFUGAL
L'invention concerne un arbre à cannes tubulaire pour un moteur thermique de véhicule automobile, qui comporte au moins un alésage de circulation d'huile d'un premier diamètre déterminé, alimenté en huile à une première extrémité par l'intermédiaire d'un orifice d'alimentation et s'étendant sensiblement suivant la longueur dudit arbre, et qui comporte une pluralité de conduits radiaux qui sont répartis suivant la longueur de l'arbre, qui traversent une paroi tubulaire de l'arbre, et qui mettent en communication l'intérieur de l'alésage avec l'extérieur de l'arbre. The invention relates to a tubular shaft for a motor vehicle engine, which comprises at least one oil circulation bore of a first determined diameter, supplied with oil at a first end via an orifice. and extending substantially along the length of said shaft, and which comprises a plurality of radial ducts which are distributed along the length of the shaft, which pass through a tubular wall of the shaft, and which put in communication the inside the bore with the outside of the shaft.
On connaît de nombreux exemples d'arbres à cames de ce type.  Many examples of camshafts of this type are known.
II est connu de l'état de la technique de nombreux moteurs comportant de tels arbres à cames qui sont destinés à permettre par exemple une lubrification des cames au contact de poussoirs des queues de soupape du moteur. Le document US4615310A décrit par exemple un tel arbre à cames dont les perçages traversent l'arbre à cames et les cames.  Numerous engines having such cam shafts are known from the state of the art, which are intended to allow, for example, lubrication of the cams in contact with pushers of the valve shanks of the engine. Document US4615310A for example describes such a camshaft whose holes pass through the camshaft and the cams.
Un tel arbre à cames ne comporte conventionnellement pas de dispositif de filtration. Pour filtrer l'huile moteur, il est nécessaire de filtrer l'huile en amont de l'arbre à cames.  Such a camshaft conventionally has no filtration device. To filter the engine oil, it is necessary to filter the oil upstream of the camshaft.
Les différents conduits radiaux peuvent également être connectés à divers organes du moteur pour permettre la lubrification desdits organes. Le débit en huile doit pour cela être assuré par tous les conduits radiaux.  The different radial ducts can also be connected to various engine components to allow the lubrication of said members. The oil flow must be ensured by all the radial ducts.
L'invention propose un dispositif alternatif de filtration de l'huile moteur qui tire parti du mouvement de rotation de l'arbre à cames lors du fonctionnement du moteur en vue de filtrer les impuretés en suspension dans l'huile moteur à l'aide d'un phénomène bien connu de centrifugation et de lubrifier des organes du moteur connectés aux différents conduits radiaux. Cependant l'huile a tendance à sortir par les orifices de sortie les plus proches de l'entrée d'alimentation ce qui peut entraîner un défaut de lubrification des organes connectés avec les orifices de sortie les plus éloignées de l'orifice d'entrée d'alimentation. Les diamètres des orifices de sortie sont de ce fait très petits, de l'ordre de 0,4mm et notamment les diamètres des orifices les plus proches de l'orifice d'alimentation en huile, ce qui augmente la difficulté de réalisation d'un tel arbre à cames. Il convient alors d'avoir des diamètres d'orifices de sortie dépendants l'un de l'autre afin de régler l'évacuation de l'huile par tous ces orifices. Ainsi, l'invention propose un arbre à cames du type décrit précédemment formant filtre à huile centrifuge et apte à évacuer de l'huile de façon uniforme par tous les orifices d'évacuation, ledit arbre à cames étant peu onéreux à la fabrication. On entend par évacuation uniforme de l'huile, le fait que le dispositif autorise de façon simultanée le passage de l'huile par tous les orifices à la fois. The invention proposes an alternative engine oil filtration device that takes advantage of the rotational movement of the camshaft during operation of the engine to filter impurities suspended in the engine oil with the aid of a well-known phenomenon of centrifugation and lubricate engine components connected to different radial ducts. However, the oil tends to exit through the outlet ports closest to the feed inlet, which can lead to a lack of lubrication of the connected members with the outlets farthest from the inlet port of the inlet. 'food. The diameters of the outlet orifices are therefore very small, of the order of 0.4 mm and in particular the diameters of the orifices closest to the oil supply orifice, which increases the difficulty of producing a such camshaft. It is then necessary to have diameters of outlets dependent on each other in order to regulate the evacuation of the oil through all these orifices. Thus, the invention provides a camshaft of the type described above forming a centrifugal oil filter and capable of discharging oil uniformly by all the discharge orifices, said camshaft being inexpensive in manufacturing. The term "uniform evacuation of the oil" means that the device simultaneously allows the passage of oil through all the ports at a time.
Dans ce but, l'invention propose un arbre à cames du type décrit précédemment, caractérisé en ce que l'alésage est fermé à une seconde extrémité opposée à la première extrémité et en ce que l'alésage est pourvu d'un moyen de retenue de l'huile qui autorise lors de la rotation de l'arbre (10), l'évacuation uniforme de l'huile par centrifugation par les conduits radiaux au-delà d'un seuil de niveau d'huile..  For this purpose, the invention proposes a camshaft of the type described above, characterized in that the bore is closed at a second end opposite the first end and in that the bore is provided with a retaining means. oil which, during rotation of the shaft (10), allows the uniform discharge of the oil by centrifugation by the radial ducts beyond an oil level threshold.
Selon d'autres caractéristiques de l'invention :  According to other features of the invention:
- le moyen de retenue comporte un réservoir apte à permettre la retenue des impuretés dans l'alésage.  - The retaining means comprises a reservoir adapted to allow the retention of impurities in the bore.
- les orifices d'évacuation de l'huile présentent des diamètres différents l'un de l'autre.  the oil discharge orifices have different diameters from one another.
- les diamètres des orifices d'évacuation de l'huile sont compris dans la plage entre 1 et 5mm.  - the diameters of the oil discharge holes are in the range between 1 and 5mm.
- l'intérieur de l'alésage (12) une extrémité d'entrée (28) qui est agencée selon un second diamètre (D28) inférieur au premier diamètre (D12), pour permettre, lors de la rotation de l'arbre (10), de former un déversoir pour l'évacuation de l'huile. - inside the bore (12) an inlet end (28) which is arranged according to a second diameter (D28) smaller than the first diameter (D12), to allow, during the rotation of the shaft (10), to form a weir for the discharge of the oil.
- l'arbre à cames comporte une pluralité de perçages qui sont répartis suivant la longueur de l'arbre, qui traversent la paroi tubulaire de l'arbre, et qui reçoivent chacun un tube rapporté dont l'extrémité d'entrée est agencée selon le second diamètre inférieur au premier diamètre,  the camshaft comprises a plurality of holes which are distributed along the length of the shaft, which pass through the tubular wall of the shaft, and which each receive an attached tube whose inlet end is arranged according to the second diameter smaller than the first diameter,
- l'arbre à cames comporte une pluralité de bossages internes qui font saillie à l'intérieur de l'alésage, qui comportent chacun un perçage traversant la paroi tubulaire de l'arbre dont l'extrémité d'entrée est agencée selon le second diamètre inférieur au premier diamètre,  the camshaft comprises a plurality of internal bosses which project inside the bore, which each comprise a bore passing through the tubular wall of the shaft whose inlet end is arranged according to the second diameter; less than the first diameter,
- la seconde extrémité de l'arbre à cames comporte un perçage obturé par un bouchon amovible.  - The second end of the camshaft has a bore closed by a removable plug.
L'invention concerne aussi un procédé de nettoyage d'un arbre à cames tubulaire pour un moteur thermique de véhicule automobile comportant un alésage de circulation d'huile d'un premier diamètre déterminé comportant à une première extrémité un orifice d'alimentation de manière préférentielle coaxial et à une seconde extrémité un perçage obturé par un bouchon, et une pluralité de conduits radiaux répartis suivant la longueur de l'arbre qui traversent une paroi tubulaire de l'arbre et dont les extrémités sont agencées selon un second diamètre inférieur au premier diamètre, caractérisé en ce qu'il comporte au moins une première étape au cours de laquelle on enlève le bouchon, une deuxième étape au cours de laquelle on nettoie l'intérieur de l'alésage, notamment à l'aide d'air comprimé ou d'un solvant et une troisième étape au cours de laquelle on replace le bouchon.  The invention also relates to a method for cleaning a tubular camshaft for a motor vehicle engine having an oil circulation bore of a first determined diameter having at a first end a feed orifice in a preferential manner. coaxial and at a second end a hole closed by a stopper, and a plurality of radial ducts distributed along the length of the shaft which pass through a tubular wall of the shaft and whose ends are arranged according to a second diameter smaller than the first diameter , characterized in that it comprises at least a first step during which the cap is removed, a second step during which the interior of the bore is cleaned, in particular using compressed air or a solvent and a third step during which the plug is replaced.
L'invention concerne aussi un outillage pour la fabrication d'un arbre à cames tubulaire pour un moteur thermique de véhicule automobile du type décrit précédemment, comportant un alésage de circulation d'huile d'un premier diamètre déterminé comportant à une première extrémité un orifice d'alimentation de manière préférentielle coaxial et à une seconde extrémité un perçage obturé par un bouchon, une pluralité de perçages radiaux répartis suivant la longueur de l'arbre qui traversent une paroi tubulaire de l'arbre, et une pluralité de tubes radiaux répartis suivant la longueur de l'arbre qui sont reçus dans les perçages et dont les extrémités sont agencées selon un second diamètre inférieur au premier diamètre, caractérisé en ce qu'il comporte : The invention also relates to a tool for manufacturing a tubular camshaft for a motor vehicle engine of the type described above, comprising an oil circulation bore of a first determined diameter having at one end an orifice power supply coaxially preferential manner and at a second end a hole closed by a plug, a plurality of radial bores distributed along the length of the shaft which pass through a tubular wall of the shaft, and a plurality of radial tubes distributed along the length of the which are received in the bores and whose ends are arranged in a second diameter smaller than the first diameter, characterized in that it comprises:
- un élément de butée destiné à être inséré à l'intérieur de l'alésage,  a stop element intended to be inserted inside the bore,
- un élément de sollicitation destiné à pousser au moins un tube dans un perçage radial correspondant jusqu'à une position de butée contre l'élément de butée.  - A biasing element for pushing at least one tube in a corresponding radial bore to a stop position against the stop member.
Selon d'autres caractéristiques de cet outillage :  According to other characteristics of this tool:
- l'élément de sollicitation comporte au moins un corps à partir duquel s'étend une dent d'une section cylindrique d'un diamètre correspondant au diamètre intérieur d'un tube et d'une longueur supérieure à celle dudit tube, apte à permettre à ladite dent de recevoir un tube et de présenter une extrémité libre faisant saillie hors du tube, et l'élément de butée comporte au moins un perçage d'un diamètre correspondant au diamètre de l'extrémité libre d'une dent, l'élément de sollicitation étant apte à pousser le tube dans un perçage de l'arbre à came, la dent étant apte à être reçue dans un perçage en regard de l'élément de butée et le tube étant apte à être serti par écrasement entre l'élément de sollicitation et l'élément de butée,  the biasing element comprises at least one body from which extends a tooth of a cylindrical section of a diameter corresponding to the inside diameter of a tube and of a length greater than that of said tube, able to allow said tooth receives a tube and has a free end protruding from the tube, and the abutment member has at least one bore of a diameter corresponding to the diameter of the free end of a tooth, the element biasing being able to push the tube in a hole of the cam shaft, the tooth being adapted to be received in a bore facing the abutment member and the tube being adapted to be squeezed by crushing between the element of solicitation and the stop element,
- l'élément de butée comporte un peigne comportant autant de dents que l'arbre à cames comporte de perçages, chaque dent étant d'une section cylindrique d'un diamètre correspondant au diamètre intérieur d'un tube et d'une longueur supérieure à celle dudit tube apte à permettre à ladite dent de recevoir un tube et de présenter une extrémité libre faisant saillie hors du tube, et l'élément de butée comporte autant de perçages que l'arbre à cames comporte de perçages, chaque perçage étant d'un diamètre correspondant au diamètre de l'extrémité libre d'une dent du peigne, le peigne étant apte à pousser les tubes dans les perçages de l'arbre à came, les dents du peigne étant aptes à être reçues dans l'élément de butée et les tubes étant aptes à être sertis par écrasement entre le peigne et l'élément de butée. the stop element comprises a comb comprising as many teeth as the camshaft has bores, each tooth being of a cylindrical section of a diameter corresponding to the inside diameter of a tube and of a length greater than that of said tube adapted to allow said tooth to receive a tube and to have a free end projecting out of the tube, and the stop element has as many holes as the camshaft has holes, each piercing being a diameter corresponding to the diameter of the free end of a tooth of the comb, the comb being able to push the tubes into the bores of the cam shaft, the teeth of the comb being able to be received in the abutment element and the tubes being able to be crimped by crushing between the comb and the abutment element.
L'invention concerne aussi de manière générale un procédé de fabrication d'un arbre à cames tubulaire du type décrit précédemment comportant un alésage de circulation d'huile d'un premier diamètre déterminé comportant à une première extrémité un orifice d'alimentation et à une seconde extrémité un perçage obturé par un bouchon, une pluralité de perçages radiaux répartis suivant la longueur de l'arbre qui traversent une paroi tubulaire de l'arbre, et une pluralité de tubes radiaux répartis suivant la longueur de l'arbre qui sont reçus dans les perçages et dont les extrémités sont agencées selon un second diamètre inférieur au premier diamètre, à l'aide d'un outillage du type décrit précédemment, caractérisé en ce qu'il comporte :  The invention also generally relates to a method of manufacturing a tubular camshaft of the type described above comprising an oil circulation bore of a first determined diameter having at a first end a feed orifice and at a second end a hole closed by a plug, a plurality of radial bores distributed along the length of the shaft which pass through a tubular wall of the shaft, and a plurality of radial tubes distributed along the length of the shaft which are received in the bores and whose ends are arranged according to a second diameter smaller than the first diameter, using a tool of the type described above, characterized in that it comprises:
- une première étape d'introduction d'un élément de butée à l'intérieur de l'alésage,  a first step of introducing a stop element into the bore,
- une deuxième étape d'introduction des tubes dans les perçages extérieurement à l'arbre à cames, a second step of introducing the tubes into the bores outside the camshaft,
- une troisième étape de sertissage au cours de laquelle les tubes sont repoussés par un élément de sollicitation dans les perçages jusqu'à être écrasés contre l'élément de butée pour être sertis dans l'arbre à cames. - A third crimping step during which the tubes are pushed by a biasing element in the holes until they are crushed against the stop element to be crimped into the camshaft.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit pour la compréhension de laquelle on se reportera aux dessins annexés dans lesquels :  Other features and advantages of the invention will appear on reading the detailed description which follows for the understanding of which reference will be made to the appended drawings in which:
- la figure 1 est une vue schématique en coupe d'un arbre à cames selon un état antérieur de la technique ; - la figure 2 est une vue schématique en coupe d'un arbre à cames selon l'invention ; - Figure 1 is a schematic sectional view of a camshaft according to a prior art; - Figure 2 is a schematic sectional view of a camshaft according to the invention;
- la figure 3 est une vue en perspective éclatée d'un arbre à cames selon l'invention et d'un outillage pour la fabrication dudit arbre à cames ;  - Figure 3 is an exploded perspective view of a camshaft according to the invention and a tool for the manufacture of said camshaft;
- la figure 4 est une vue en perspective assemblée d'un arbre à cames selon l'invention et d'un outillage pour la fabrication dudit arbre à cames ;  - Figure 4 is an assembled perspective view of a camshaft according to the invention and a tool for the manufacture of said camshaft;
- la figure 5 est une vue d'ensemble en coupe représentant des deuxième et troisième étapes d'un procédé de fabrication de l'arbre à cames pour un moteur selon l'invention ;  FIG. 5 is an overall sectional view showing second and third stages of a method of manufacturing the camshaft for an engine according to the invention;
- la figure 6 est une vue de détail en coupe représentant la troisième étape du procédé de fabrication de la culasse pour un moteur selon l'invention.  - Figure 6 is a detailed sectional view showing the third step of the manufacturing process of the cylinder head for an engine according to the invention.
Dans la description qui va suivre, des chiffres de référence identiques désignent des pièces identiques ou ayant des fonctions similaires.  In the following description, like reference numerals designate like parts or having similar functions.
On a représenté à la figure 1 un arbre à cames tubulaire 10 pour un moteur thermique de véhicule automobile réalisé selon un état de la technique.  FIG. 1 shows a tubular camshaft 10 for a motor vehicle engine engine produced according to a state of the art.
De manière connue, l'arbre 10 comporte au moins un alésage 12 de circulation d'huile d'un premier diamètre "D12" déterminé, qui est alimenté en huile à une première extrémité 14 de l'arbre 10 par l'intermédiaire d'un orifice 16 d'alimentation de manière préférentielle coaxial par lequel de l'huile est injectée dans l'arbre 10. Le flux d'huile "H" a été représenté par des flèches sur les figures 1 et 2.  In known manner, the shaft 10 comprises at least one bore 12 of oil circulation of a first diameter "D12" determined, which is supplied with oil at a first end 14 of the shaft 10 via a preferably coaxial feed port 16 through which oil is injected into the shaft 10. The oil flow "H" has been represented by arrows in FIGS. 1 and 2.
Un convergent 17 peut être agencé en entrée de l'orifice 16 pour canaliser le flux d'huile "H" vers l'alésage 12.  A convergent 17 may be arranged at the inlet of the orifice 16 to channel the flow of oil "H" towards the bore 12.
L'alésage 12 s'étend sensiblement suivant la longueur de l'arbre 10.  The bore 12 extends substantially along the length of the shaft 10.
L'arbre 10 comporte une pluralité de conduits radiaux 18 qui sont répartis suivant la longueur de l'arbre 10, qui traversent une paroi tubulaire 20 de l'arbre 10, et qui mettent en communication l'intérieur de l'alésage 12 avec l'extérieur de l'arbre 10. The shaft 10 comprises a plurality of radial ducts 18 which are distributed along the length of the shaft 10, which pass through a tubular wall 20 of the shaft 10, and which put the interior of the bore 12 into communication with the outside of the shaft 10.
Dans un tel arbre, l'huile est éjectée de l'arbre 10 au fur et à mesure de son introduction du fait de la rotation de l'arbre 10.  In such a shaft, the oil is ejected from the shaft 10 as it is introduced due to the rotation of the shaft 10.
Dans le cas où l'huile contient des impuretés 24, ces impuretés sont mélangées au film 22 d'huile "H" qui tapisse l'alésage 12.  In the case where the oil contains impurities 24, these impurities are mixed with the film 22 of oil "H" which lines the bore 12.
Ces impuretés 24 sont susceptibles d'obturer les conduits radiaux 18 si leur taille est supérieure à celle desdits conduits 18, comme représenté à gauche de la figure 1.  These impurities 24 are likely to close the radial ducts 18 if their size is greater than that of said ducts 18, as shown on the left of Figure 1.
Il s'ensuit alors un défaut de distribution de l'huile au travers desdits conduits pouvant conduire à une détérioration des cames de l'arbre à cames 10 et/ou des éléments avec lesquelles elles interagissent.  It follows then a defect of distribution of the oil through said ducts can lead to deterioration of the cams of the camshaft 10 and / or elements with which they interact.
Une solution conventionnelle consiste à filtrer l'huile en amont de l'arbre à cames 10, mais cette solution demeure coûteuse. L'invention propose de tirer parti du mouvement de rotation de l'arbre à cames 10 pour proposer un arbre à cames dont l'huile est filtrée par centrifugation.  A conventional solution is to filter the oil upstream of the camshaft 10, but this solution remains expensive. The invention proposes to take advantage of the rotational movement of the camshaft 10 to provide a camshaft whose oil is filtered by centrifugation.
Dans ce but, comme l'illustre la figure 2, l'invention propose un arbre à cames 10 du type décrit précédemment caractérisé en ce que l'alésage 10 est fermé à une seconde extrémité 26 opposée à la première extrémité 14 et en ce que chaque conduit 18 radial comporte à l'intérieur de l'alésage 12 une extrémité d'entrée 28 qui est agencée selon un second diamètre "D28" inférieur au premier diamètre "D12", pour permettre, lors de la rotation de l'arbre 10, de former un déversoir apte à permettre l'évacuation de l'huile "H" par centrifugation et la retenue des impuretés dans l'alésage 12. For this purpose, as illustrated in Figure 2, the invention provides a camshaft 10 of the type described above characterized in that the bore 10 is closed at a second end 26 opposite the first end 14 and in that each radial duct 18 has inside the bore 12 an inlet end 28 which is arranged according to a second diameter "D 2 8" smaller than the first diameter "D12", to allow, during the rotation of the shaft 10, to form a weir capable of allowing the evacuation of the oil "H" by centrifugation and the retention of impurities in the bore 12.
En effet, dans cette configuration, la rotation de l'arbre 10 permet de soumettre les impuretés 22 à une force centrifuge qui les plaque contre la paroi interne 20 de l'alésage 12. Cette paroi, agencée selon la diamètre "D12" est agencée en retrait de l'extrémité 28 des conduits 18, de sorte que les impuretés 24 ne peuvent pénétrer dans les conduits 18. Indeed, in this configuration, the rotation of the shaft 10 makes it possible to subject the impurities 22 to a centrifugal force which plates them against the inner wall 20 of the bore 12. This wall, arranged according to the diameter "D12" is arranged behind the end 28 of the ducts 18, so that the impurities 24 can not enter the ducts 18.
Lors de la mise en rotation de l'arbre 10, l'alésage 12 de l'arbre 10 se remplit d'huile "H" jusqu'à ce que le niveau du film d'huile sur la paroi interne de l'alésage 12 atteigne le diamètre "D28". L'huile "H" en surplus est alors évacuée par les conduits 18 tandis que les impuretés 24 sont confinées contre la paroi interne de l'alésage 12. When rotating the shaft 10, the bore 12 of the shaft 10 fills with oil "H" until the level of the oil film on the inner wall of the bore 12 reaches the diameter "D 28 ". The surplus oil "H" is then discharged through the ducts 18 while the impurities 24 are confined against the inner wall of the bore 12.
Les diamètres desdits orifices d'évacuation peuvent être indépendants l'un de l'autre : l'huile « H » en surplus au-delà du seuil défini par les différences entre le diamètre de la paroi interne de l'alésage et du second diamètre "D28", passe pardessus l'extrémité d'entrée 28 des conduits pour être évacuée de façon uniforme et lubrifier les organes connectés aux dits conduits. Il n'est pas nécessaire ni d'opter pour des diamètres des orifices d'évacuation très petits, ni de réaliser des diamètres dépendant l'un de l'autre pour régler l'évacuation de l'huile.  The diameters of said discharge holes may be independent of one another: the oil "H" surplus beyond the threshold defined by the differences between the diameter of the inner wall of the bore and the second diameter "D28", passes over the inlet end 28 of the ducts to be uniformly discharged and lubricate the organs connected to said ducts. It is not necessary either to opt for very small diameters of the discharge holes, nor to make diameters dependent on one another to regulate the evacuation of the oil.
Tout mode de réalisation des conduits 18 apte à proposer une extrémité 28 des conduits 18 agencée suivant le diamètre "D28" peut convenir à la bonne mise en œuvre de l'invention. Any embodiment of the ducts 18 adapted to provide an end 28 of the ducts 18 arranged according to the diameter "D 2 8" may be suitable for the proper implementation of the invention.
Notamment, l'arbre à cames 10 pourrait, comme l'illustre la figure 2, comporter une pluralité de bossages internes 30 qui font saillie à l'intérieur l'alésage 12, qui comportent chacun un perçage 32 traversant la paroi tubulaire 20 de l'arbre pour former les conduits 18 et dont l'extrémité d'entrée 28 est agencée selon le second diamètre "D28" inférieur au premier diamètre "Dis". In particular, the camshaft 10 could, as illustrated in FIG. 2, have a plurality of internal bosses 30 that project inside the bore 12, each having a bore 32 passing through the tubular wall 20 of the housing. shaft to form the ducts 18 and of which the inlet end 28 is arranged in the second diameter "D 2 8" than the first diameter "Dis".
Toutefois, dans le mode de réalisation préféré de l'invention, comme représenté à la figure 5, l'arbre à cames 10 comporte une pluralité de perçages 32 qui sont répartis suivant la longueur de l'arbre 10, qui traversent la paroi tubulaire 10 de l'arbre, et qui reçoivent chacun un tube 34 rapporté dont l'extrémité d'entrée 28 est agencée selon le second diamètre "D28" inférieur au premier diamètre "Dis". However, in the preferred embodiment of the invention, as shown in Figure 5, the camshaft 10 has a plurality of holes 32 which are distributed along the length of the shaft 10, which pass through the tubular wall 10 of the tree, and which each receive a tube 34 reported which the inlet end 28 is arranged in the second diameter "D 2 8" than the first diameter "Dis".
Tout moyen d'obturation de l'alésage 12 peut convenir à la mise en œuvre de l'invention. Notamment, l'alésage 12 pourrait être borgne.  Any means for closing the bore 12 may be suitable for the implementation of the invention. In particular, the bore 12 could be blind.
Toutefois, dans le mode de réalisation préféré de l'invention, la seconde extrémité 26 de l'arbre à cames comporte un perçage 36 obturé par un bouchon amovible 38, comme représenté à la figure 2. De manière non limitative de l'invention, le perçage 36 peut être confondu avec le diamètre de l'alésage 12.  However, in the preferred embodiment of the invention, the second end 26 of the camshaft comprises a bore 36 closed by a removable cap 38, as shown in Figure 2. Without limitation of the invention, the bore 36 can be confused with the diameter of the bore 12.
Cette configuration permet de déterminer un procédé de nettoyage d'un tel arbre à cames tubulaire 10 afin d'éliminer les impuretés qui s'y seraient déposées.  This configuration makes it possible to determine a method of cleaning such a tubular camshaft 10 in order to eliminate the impurities that would have been deposited therein.
Conformément à l'invention, ce procédé de nettoyage comporte au moins une première étape au cours de laquelle on enlève le bouchon 38, une deuxième étape au cours de laquelle on nettoie l'intérieur de l'alésage 12, et une troisième étape au cours de laquelle on replace le bouchon 38.  According to the invention, this cleaning method comprises at least a first step during which the stopper 38 is removed, a second step during which the interior of the bore 12 is cleaned, and a third step during of which we replace the cap 38.
Plusieurs méthodes peuvent être envisagées pour nettoyer l'alésage 12, notamment en soufflant de l'air comprimé dans l'alésage 12 ou en utilisant un solvant.  Several methods can be envisaged for cleaning the bore 12, in particular by blowing compressed air into the bore 12 or by using a solvent.
La fabrication d'un arbre 10 selon le mode de réalisation préféré de l'invention comportant des conduits 18 constitués pour partie de tubes 34 nécessite un sertissage des tubes 34 dans les perçages 32 afin de garantir que l'extrémité 28 desdits tubes 34 est bien agencée selon le diamètre "D28"-The manufacture of a shaft 10 according to the preferred embodiment of the invention comprising ducts 18 constituted in part by tubes 34 requires a crimping of the tubes 34 in the holes 32 to ensure that the end 28 of said tubes 34 is well arranged according to the diameter "D 2 8" -
A cet effet, comme l'illustrent les figures 5 et 6, un tel procédé comporte une première étape d'introduction d'un élément de butée 40 à l'intérieur de l'alésage 12, puis une deuxième étape d'introduction des tubes 34 dans les perçages 32 extérieurement à l'arbre à cames 10, et enfin une troisième étape de sertissage au cours de laquelle les tubes 34 sont repoussés par un élément de sollicitation 42 dans les perçages 32 jusqu'à être écrasés contre l'élément de butée 40 pour être sertis dans l'arbre à cames 10. For this purpose, as illustrated in FIGS. 5 and 6, such a method comprises a first step of introducing an abutment element 40 inside the bore 12, then a second step of introducing the tubes 34 in the holes 32 externally to the camshaft 10, and finally a third crimping step during which the tubes 34 are repulsed by an element 42 in the holes 32 to be crushed against the stop member 40 to be crimped in the camshaft 10.
Conformément à l'invention, on utilise un outillage spécialisé pour la fabrication de l'arbre à cames 10.  According to the invention, specialized tools are used for the manufacture of the camshaft 10.
Cet outillage comporte comme on l'a vu un élément 40 de butée destiné à être inséré à l'intérieur de l'alésage 12 et un élément 42 de sollicitation destiné à pousser au moins un tube 34 dans un perçage radial 32 correspondant jusqu'à une position de butée contre l'élément 40 de butée.  This tool comprises, as has been seen, a stop element 40 intended to be inserted inside the bore 12 and a biasing element 42 intended to push at least one tube 34 into a corresponding radial bore 32 up to a stop position against the abutment member 40.
Comme l'illustrent les figures 5 et 6, l'élément 42 de sollicitation comporte au moins un corps 44 à partir duquel s'étend une dent 46 d'une section cylindrique d'un diamètre correspondant au diamètre intérieur d'un tube 34 et d'une longueur supérieure à celle dudit tube 34, apte à permettre à ladite dent 46 de recevoir un tube 34 et de présenter une extrémité libre 48 faisant saillie hors du tube, comme représenté plus particulièrement à la figure 6.  As illustrated in FIGS. 5 and 6, the biasing element 42 comprises at least one body 44 from which extends a tooth 46 of a cylindrical section with a diameter corresponding to the inside diameter of a tube 34 and a length greater than that of said tube 34, adapted to allow said tooth 46 to receive a tube 34 and to have a free end 48 projecting out of the tube, as shown more particularly in Figure 6.
Comme l'illustre la figure 6, l'élément de butée 40 comporte au moins un perçage 50 d'un diamètre correspondant au diamètre de l'extrémité libre d'une dent 46,  As illustrated in FIG. 6, the stop element 40 comprises at least one hole 50 of a diameter corresponding to the diameter of the free end of a tooth 46,
Dans cette configuration, l'élément 42 de sollicitation peut pousser le tube 34 dans un perçage 32 de l'arbre à came, puis la dent 46 est dans un perçage 50 de l'élément 40 de butée agencé en regard du perçage 32. En poursuivant la sollicitation, le tube 34 est serti par écrasement entre l'élément 42 de sollicitation et l'élément 40 de butée.  In this configuration, the biasing element 42 can push the tube 34 into a hole 32 of the cam shaft, then the tooth 46 is in a hole 50 of the abutment member 40 arranged opposite the bore 32. In FIG. continuing the bias, the tube 34 is crimped between the biasing element 42 and the abutment member 40.
En variante, (non représentée) l'outillage pourrait permettre de réaliser en une seule passe tous les sertissages de l'arbre à cames 10.  As a variant, (not shown) the tooling could make it possible to carry out in one pass all the crimps of the camshaft 10.
Selon cette variante, l'élément de sollicitation pourrait comporter un peigne comportant autant de dents 46 que l'arbre à cames comporte de perçages 32, chaque dent 46 étant d'une section cylindrique d'un diamètre correspondant au diamètre intérieur d'un tube 34 et d'une longueur supérieure à celle dudit tube 34 apte à permettre à ladite dent 46 de recevoir un tube 46 et de présenter une extrémité libre 48 faisant saillie hors du tube 34. According to this variant, the biasing element could comprise a comb comprising as many teeth 46 as the camshaft has holes 32, each tooth 46 being of a cylindrical section of a diameter corresponding to the internal diameter of a tube 34 and of a length greater than that of said tube 34 adapted to allow said tooth 46 to receive a tube 46 and to have a free end 48 projecting from the tube 34.
L'élément de butée 40 comporterait alors autant de perçages 50 que l'arbre à cames 10 comporte de perçages 32, chaque perçage 50 étant d'un diamètre correspondant au diamètre de l'extrémité libre 48 d'une dent 46 du peigne.  The stop element 40 would then have as many holes 50 as the camshaft 10 has holes 32, each hole 50 being of a diameter corresponding to the diameter of the free end 48 of a tooth 46 of the comb.
En ce cas le peigne serait apte à pousser simultanément tous les tubes 34 dans les perçages 32 de l'arbre à cames 10, puis les dents 48 du peigne seraient reçues dans l'élément 40 de butée et les tubes 34 seraient sertis par écrasement entre le peigne et l'élément 40 de butée.  In this case the comb would be able to simultaneously push all the tubes 34 in the holes 32 of the camshaft 10, then the teeth 48 of the comb would be received in the abutment member 40 and the tubes 34 would be crimped between the comb and the abutment member 40.
L'invention permet donc de proposer un arbre à cames 10 formant filtre à huile centrifuge ainsi qu'un procédé de fabrication simple et économique dudit arbre à cames 10.  The invention thus makes it possible to propose a camshaft 10 forming a centrifugal oil filter and a method of simple and economical manufacture of said camshaft 10.

Claims

REVENDICATIONS
1. Arbre à cannes (10) tubulaire pour un moteur thermique de véhicule automobile, qui comporte au moins un alésage (12) de circulation d'huile d'un premier diamètre (D12) déterminé, alimenté en huile (H) à une première extrémité (14) par l'intermédiaire d'un orifice (16) d'alimentation et s'étendant sensiblement suivant la longueur dudit arbre (10), et qui comporte une pluralité de conduits radiaux (18) qui sont répartis suivant la longueur de l'arbre (10), qui traversent une paroi tubulaire (20) de l'arbre (10), et qui mettent en communication l'intérieur de l'alésage (12) avec l'extérieur de l'arbre (10), 1. Tubular rod shaft (10) for a motor vehicle thermal engine, which comprises at least one oil circulation bore (12) of a first determined diameter (D12), supplied with oil (H) at a first end (14) via a feed orifice (16) and extending substantially along the length of said shaft (10), and which comprises a plurality of radial conduits (18) which are distributed along the length of the shaft (10), which pass through a tubular wall (20) of the shaft (10), and which put the interior of the bore (12) into communication with the exterior of the shaft (10),
caractérisé en ce que l'alésage (12) est fermé à une seconde extrémité opposée (26) à la première extrémité (14) et en ce que l'alésage est pourvu d'un moyen de retenue de l'huile qui autorise lors de la rotation de l'arbre (10), l'évacuation uniforme de l'huile par centrifugation par les conduits radiaux au- delà d'un seuil de niveau d'huile. characterized in that the bore (12) is closed at a second end opposite (26) to the first end (14) and in that the bore is provided with an oil retaining means which allows when the rotation of the shaft (10), the uniform evacuation of the oil by centrifugation through the radial conduits beyond an oil level threshold.
2 . Arbre à cames (10) selon la revendication 1 caractérisé en ce que le moyen de retenue comporte un réservoir apte à permettre la retenue des impuretés dans l'alésage (12). 2. Camshaft (10) according to claim 1 characterized in that the retaining means comprises a reservoir capable of allowing impurities to be retained in the bore (12).
3. Arbre à cames (10) selon la revendication précédente, caractérisé en ce que les orifices d'évacuation de l'huile présentent des diamètres indépendants l'un de l'autre. 3. Camshaft (10) according to the preceding claim, characterized in that the oil evacuation orifices have diameters independent of each other.
4. Arbre à cames (10) selon la revendication précédente, caractérisé en ce que les diamètres des orifices d'évacuation de l'huile sont compris dans la plage entre 1 et 5mm. 4. Camshaft (10) according to the preceding claim, characterized in that the diameters of the oil evacuation orifices are in the range between 1 and 5mm.
5 Arbre à cames (10) selon l'une des revendications 1 à 4, caractérisé en ce que chaque conduit radial (18) comporte à l'intérieur de l'alésage (12) une extrémité d'entrée (28) qui est agencée selon un second diamètre (D28) inférieur au premier diamètre (D12), pour permettre, lors de la rotation de l'arbre (10), de former un déversoir pour l'évacuation de l'huile. 5 Camshaft (10) according to one of claims 1 to 4, characterized in that each radial conduit (18) comprises inside the bore (12) an inlet end (28) which is arranged according to a second diameter (D28) less than the first diameter (D12), to allow, during the rotation of the shaft (10), to form a spillway for the evacuation of the oil.
6. Arbre à cannes (10) selon l'une des revendications 1 à 5, caractérisé en ce que l'arbre à cannes (10) comporte une pluralité de perçages (32) qui sont répartis suivant la longueur de l'arbre (10), qui traversent la paroi tubulaire (20) de l'arbre (10), et qui reçoivent chacun un tube (34) rapporté dont l'extrémité d'entrée (28) est agencée selon le second diamètre (D28) inférieur au premier diamètre (Di2). 6. Rod tree (10) according to one of claims 1 to 5, characterized in that the rod tree (10) comprises a plurality of holes (32) which are distributed along the length of the tree (10). ), which pass through the tubular wall (20) of the shaft (10), and which each receive an attached tube (34) whose inlet end (28) is arranged according to the second diameter (D 28 ) less than the first diameter (Di 2 ).
7. Arbre à cames (10) selon l'une des revendications 1 à 5, caractérisé en ce que l'arbre à cames (10) comporte une pluralité de bossages internes (30) qui font saillie à l'intérieur de l'alésage (10), qui comportent chacun un perçage (32) traversant la paroi tubulaire (20) de l'arbre (10) dont l'extrémité d'entrée (28) est agencée selon le second diamètre (D28) inférieur au premier diamètre (D12). 7. Camshaft (10) according to one of claims 1 to 5, characterized in that the camshaft (10) comprises a plurality of internal bosses (30) which project inside the bore (10), which each comprise a bore (32) passing through the tubular wall (20) of the shaft (10) whose inlet end (28) is arranged according to the second diameter (D 28 ) less than the first diameter (D12).
8. Arbre à cames (10) selon l'une des revendications précédentes, caractérisé en ce que la seconde extrémité (26) de l'arbre à cames comporte un perçage (36) obturé par un bouchon amovible (38). 8. Camshaft (10) according to one of the preceding claims, characterized in that the second end (26) of the camshaft comprises a bore (36) closed by a removable plug (38).
9. Procédé de nettoyage d'un arbre (10) à cames tubulaire pour un moteur thermique de véhicule automobile comportant un alésage (12) de circulation d'huile d'un premier diamètre déterminé (Di2) comportant à une première extrémité (14) un orifice (16) d'alimentation coaxial et à une seconde extrémité (26) un perçage (36) obturé par un bouchon (38), et une pluralité de conduits radiaux (18) répartis suivant la longueur de l'arbre (10) qui traversent une paroi tubulaire (20) de l'arbre et dont les extrémités (28) sont agencées selon un second diamètre (D28) inférieur au premier diamètre (Di2), 9. Method for cleaning a tubular camshaft (10) for a motor vehicle thermal engine comprising an oil circulation bore (12) of a first determined diameter (Di 2 ) comprising at a first end (14 ) a coaxial supply orifice (16) and at a second end (26) a bore (36) closed by a plug (38), and a plurality of radial conduits (18) distributed along the length of the shaft (10 ) which pass through a tubular wall (20) of the shaft and whose ends (28) are arranged according to a second diameter (D 28 ) less than the first diameter (Di 2 ),
caractérisé en ce qu'il comporte au moins une première étape au cours de laquelle on enlève le bouchon (38), une deuxième étape au cours de laquelle on nettoie l'intérieur de l'alésage (12), notamment à l'aide d'air comprimé ou d'un solvant, et une troisième étape au cours de laquelle on replace le bouchon (38). characterized in that it comprises at least a first step during which the plug (38) is removed, a second step during which the interior of the bore (12) is cleaned, in particular using compressed air or a solvent, and a third step during which the plug (38) is replaced.
10. Outillage pour la fabrication d'un arbre à cames (10) tubulaire pour un moteur thermique de véhicule automobile comportant un alésage (12) de circulation d'huile d'un premier diamètre déterminé (D12) comportant à une première extrémité (14) un orifice (16) d'alimentation coaxial et à une seconde extrémité (26) un perçage (36) obturé par un bouchon (38), une pluralité de perçages radiaux (32) répartis suivant la longueur de l'arbre (10) qui traversent une paroi tubulaire (20) de l'arbre (10), et une pluralité de tubes radiaux (34) répartis suivant la longueur de l'arbre (10) qui sont reçus dans les perçages (32) et dont les extrémités (28) sont agencées selon un second diamètre (D2s) inférieur au premier diamètre (D12), caractérisé en ce qu'il comporte : 10. Tooling for the manufacture of a tubular camshaft (10) for a motor vehicle thermal engine comprising an oil circulation bore (12) of a first determined diameter (D12) comprising at a first end (14 ) a coaxial supply orifice (16) and at a second end (26) a bore (36) closed by a plug (38), a plurality of radial bores (32) distributed along the length of the shaft (10) which pass through a tubular wall (20) of the shaft (10), and a plurality of radial tubes (34) distributed along the length of the shaft (10) which are received in the bores (32) and whose ends ( 28) are arranged according to a second diameter (D 2 s) less than the first diameter (D12), characterized in that it comprises:
- un élément de butée (40) destiné à être inséré à l'intérieur de l'alésage (12), - a stop element (40) intended to be inserted inside the bore (12),
- un élément (42) de sollicitation destiné à pousser au moins un tube (34) dans un perçage radial (32) correspondant jusqu'à une position de butée contre l'élément (40) de butée. - a biasing element (42) intended to push at least one tube (34) in a corresponding radial bore (32) up to an abutment position against the abutment element (40).
11. Outillage selon la revendication précédente, caractérisé en ce que : 11. Tooling according to the preceding claim, characterized in that:
- l'élément de sollicitation (42) comporte au moins un corps (44) à partir duquel s'étend une dent (46) d'une section cylindrique d'un diamètre correspondant au diamètre intérieur d'un tube (34) et d'une longueur supérieure à celle dudit tube (34), apte à permettre à ladite dent (46) de recevoir un tube (34) et de présenter une extrémité libre (48) faisant saillie hors du tube (34), - the biasing element (42) comprises at least one body (44) from which extends a tooth (46) of a cylindrical section of a diameter corresponding to the internal diameter of a tube (34) and 'a length greater than that of said tube (34), capable of allowing said tooth (46) to receive a tube (34) and to have a free end (48) projecting out of the tube (34),
- l'élément de butée (40) comporte au moins un perçage d'un diamètre correspondant au diamètre de l'extrémité libre d'une dent (46), l'élément de sollicitation (42) étant apte à pousser le tube (34) dans un perçage (32) de l'arbre à cames (10), la dent (46) étant apte à être reçue dans un perçage (50) en regard de l'élément (40) de butée et le tube (34) étant apte à être serti par écrasement entre l'élément de sollicitation (42) et l'élément (40)de butée. - the stop element (40) comprises at least one bore of a diameter corresponding to the diameter of the free end of a tooth (46), the biasing element (42) being capable of pushing the tube (34) into a bore (32) of the camshaft (10), the tooth (46) being capable of being received in a bore (50) in facing the stop element (40) and the tube (34) being able to be crimped by crushing between the biasing element (42) and the stop element (40).
12. Outillage selon la revendication précédente, caractérisé en ce que : 12. Tooling according to the preceding claim, characterized in that:
- l'élément de sollicitation (46) comporte un peigne comportant autant de dents (46) que l'arbre à cames (10) comporte de perçages (32), chaque dent (42) étant d'une section cylindrique d'un diamètre correspondant au diamètre intérieur d'un tube (34) et d'une longueur supérieure à celle dudit tube (34) apte à permettre à ladite dent (46) de recevoir un tube (34) et de présenter une extrémité libre (48) faisant saillie hors du tube (34), - the biasing element (46) comprises a comb having as many teeth (46) as the camshaft (10) has holes (32), each tooth (42) being of a cylindrical section of a diameter corresponding to the internal diameter of a tube (34) and of a length greater than that of said tube (34) capable of allowing said tooth (46) to receive a tube (34) and to have a free end (48) making protruding out of the tube (34),
- l'élément de butée (40) comporte autant de perçages (50) que l'arbre à cames (10) comporte de perçages (32), chaque perçage (50) étant d'un diamètre correspondant au diamètre de l'extrémité libre (48) d'une dent (46) du peigne, - the stop element (40) has as many holes (50) as the camshaft (10) has holes (32), each hole (50) having a diameter corresponding to the diameter of the free end (48) of a tooth (46) of the comb,
le peigne étant apte à pousser les tubes (34) dans les perçages (32) de l'arbre à came, les dents (46) du peigne étant aptes à être reçues dans l'élément (40) de butée et les tubes (34) étant aptes à être sertis par écrasement entre le peigne et l'élément de butée (40). the comb being able to push the tubes (34) into the holes (32) of the camshaft, the teeth (46) of the comb being able to be received in the stop element (40) and the tubes (34 ) being capable of being crimped by crushing between the comb and the stop element (40).
13. Procédé de fabrication d'un arbre (10) à cames tubulaire pour un moteur thermique de véhicule automobile selon les revendications 1 à 4 comportant un alésage (12) de circulation d'huile (H) d'un premier diamètre déterminé (D12) comportant à une première extrémité (14) un orifice (16) d'alimentation coaxial et à une seconde extrémité (26) un perçage (36) obturé par un bouchon (38), une pluralité de perçages radiaux (32) répartis suivant la longueur de l'arbre qui traversent une paroi tubulaire (20) de l'arbre, et une pluralité de tubes radiaux (34) répartis suivant la longueur de l'arbre (10) qui sont reçus dans les perçages (32) et dont les extrémités (28) sont agencées selon un second diamètre inférieur (D2s) au premier diamètre (Di2), à l'aide d'un outillage selon l'une des revendications 6 ou 7, 13. Method of manufacturing a tubular camshaft (10) for a motor vehicle thermal engine according to claims 1 to 4 comprising an oil circulation bore (12) of a first determined diameter (D12 ) comprising at a first end (14) a coaxial supply orifice (16) and at a second end (26) a bore (36) closed by a plug (38), a plurality of radial bores (32) distributed along the length of the shaft which pass through a tubular wall (20) of the shaft, and a plurality of radial tubes (34) distributed according to the length of the shaft (10) which are received in the holes (32) and whose ends (28) are arranged according to a second diameter smaller (D 2 s) than the first diameter (Di 2 ), using a tool according to one of claims 6 or 7,
caractérisé en ce qu'il comporte : characterized in that it comprises:
- une première étape d'introduction d'un élément (40) de butée à l'intérieur de l'alésage, - a first step of introducing a stop element (40) inside the bore,
- une deuxième étape d'introduction des tubes (34) dans les perçages (32) extérieurement à l'arbre à cames (10), - une troisième étape de sertissage au cours de laquelle les tubes (34) sont repoussés par un élément de sollicitation (42) dans les perçages (34) jusqu'à être écrasés contre l'élément de butée (40) pour être sertis dans l'arbre à cames (10). - a second step of introducing the tubes (34) into the holes (32) external to the camshaft (10), - a third crimping step during which the tubes (34) are pushed back by a pressing element bias (42) in the holes (34) until they are crushed against the stop element (40) to be crimped into the camshaft (10).
PCT/FR2015/050065 2014-01-16 2015-01-13 Tubular camshaft forming centrifugal oil filter WO2015107292A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP15704041.1A EP3094835B1 (en) 2014-01-16 2015-01-13 Tubular camshaft forming a centrifugal oil filter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1450336A FR3016394B1 (en) 2014-01-16 2014-01-16 "TUBULAR CAM SHAFT FORMING CENTRIFUGAL OIL FILTER"
FR1450336 2014-01-16

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615310A (en) 1983-09-28 1986-10-07 Nippon Piston Ring Co., Ltd. Camshaft with lubricating oil supplying function
US4651704A (en) * 1985-01-30 1987-03-24 Honda Giken Kogyo Kabushiki Kaisha Breather arrangement for cam case of internal combustion engine
JPS62203909A (en) * 1986-03-01 1987-09-08 Nippon Piston Ring Co Ltd Hollow cam shaft
DE102007054992A1 (en) * 2007-11-17 2009-05-20 Audi Ag Internal combustion engine, has lubricant circuit provided for carrying out lubrication within cylinder head by lubricant mist, which is directly or indirectly discharged from camshaft, which is arranged in cylinder head
DE102010019131A1 (en) * 2010-04-30 2011-11-03 Mahle International Gmbh Internal-combustion engine has hollow cam shaft mounted in cylinder head for driving inlet valve or outlet valve through valve gear
JP2012021437A (en) * 2010-07-13 2012-02-02 Toyota Motor Corp Apparatus for preventing oil deterioration of internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4615310A (en) 1983-09-28 1986-10-07 Nippon Piston Ring Co., Ltd. Camshaft with lubricating oil supplying function
US4651704A (en) * 1985-01-30 1987-03-24 Honda Giken Kogyo Kabushiki Kaisha Breather arrangement for cam case of internal combustion engine
JPS62203909A (en) * 1986-03-01 1987-09-08 Nippon Piston Ring Co Ltd Hollow cam shaft
DE102007054992A1 (en) * 2007-11-17 2009-05-20 Audi Ag Internal combustion engine, has lubricant circuit provided for carrying out lubrication within cylinder head by lubricant mist, which is directly or indirectly discharged from camshaft, which is arranged in cylinder head
DE102010019131A1 (en) * 2010-04-30 2011-11-03 Mahle International Gmbh Internal-combustion engine has hollow cam shaft mounted in cylinder head for driving inlet valve or outlet valve through valve gear
JP2012021437A (en) * 2010-07-13 2012-02-02 Toyota Motor Corp Apparatus for preventing oil deterioration of internal combustion engine

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EP3094835A1 (en) 2016-11-23
FR3016394A1 (en) 2015-07-17
FR3016394B1 (en) 2016-01-01
EP3094835B1 (en) 2019-08-28

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