EP3033499B1 - Camshaft assembly and camshaft arrangement - Google Patents

Camshaft assembly and camshaft arrangement Download PDF

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Publication number
EP3033499B1
EP3033499B1 EP14743994.7A EP14743994A EP3033499B1 EP 3033499 B1 EP3033499 B1 EP 3033499B1 EP 14743994 A EP14743994 A EP 14743994A EP 3033499 B1 EP3033499 B1 EP 3033499B1
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EP
European Patent Office
Prior art keywords
camshaft
protection device
splash guard
spray protection
assembly according
Prior art date
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EP14743994.7A
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German (de)
French (fr)
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EP3033499A1 (en
Inventor
Robert Reichelt
Ulf MÜLLER
Jürgen MEUSEL
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Thyssenkrupp Dynamic Components Teccenter AG
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ThyssenKrupp Presta TecCenter AG
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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
    • 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
    • F01M13/0416—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil arranged in valve-covers
    • 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
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M2013/0038—Layout of crankcase breathing systems
    • F01M2013/005—Layout of crankcase breathing systems having one or more deoilers
    • F01M2013/0061—Layout of crankcase breathing systems having one or more deoilers having a plurality of deoilers
    • F01M2013/0072—Layout of crankcase breathing systems having one or more deoilers having a plurality of deoilers in series
    • 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
    • F01M2013/0427—Separating oil and gas with a centrifuge device the centrifuge device having no rotating part, e.g. cyclone
    • 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
    • F01M2013/0438—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil with a filter

Definitions

  • the present invention relates to a camshaft assembly having a camshaft housing and a camshaft rotatably mounted about a longitudinal direction in the camshaft housing, wherein the camshaft has a hollow shaft portion with at least one radial inlet opening for discharging a gas through the hollow shaft portion and wherein in the region of the at least one radial inlet opening a splash guard is arranged.
  • the subject matter of the invention is also a camshaft arrangement which has the camshaft and the splashguard device and which is provided for installation in the camshaft housing.
  • blowby gas In internal combustion engines with valves driven by a camshaft leakage losses are observed in practice between the cylinder wall and the piston as well as to the individual valves, which are due to an incomplete seal. These leakage losses are referred to as blowby gas and contain a significant amount of oil. In internal combustion engines, it is therefore customary to direct the blow-by gas accumulating in the camshaft housing back into the intake tract of the internal combustion engine. On the one hand to minimize the loss of oil by blow-by gas and on the other hand to ensure optimum combustion and minimum environmental impact, it is known to subject the blowby gas to oil separation and to pass the separated oil back into the oil circuit.
  • the blow-by gas may be passed through a separate oil separator located in or on the camshaft housing.
  • the present invention relates to an embodiment of the camshaft assembly in which the camshaft has a hollow shaft portion Having at least one radial inlet opening for discharging the blowby gas through the hollow shaft portion therethrough.
  • An additional function of the camshaft is therefore the discharge of the blow-by gas, wherein an oil separation can take place both within the hollow shaft section and additionally or alternatively in the further flow course.
  • Generic camshaft assemblies are from the DE 10 2005 022 254 A1 and DE 10 2011 000 458 A1 known.
  • the DE 10 2005 022 254 A1 is arranged on the camshaft, a pre-separator, the radial inlet openings partially covered and thus forms a splash guard.
  • the supplied blowby gas is set in rotation by the rotating movement of the pre-separator, whereby droplets contained in the blowby gas can be at least partly precipitated on the inner wall of the pre-separator.
  • a splash guard which has a radially exposed jacket with radial passage openings and projections between the passage openings.
  • the projections produce upon rotation of the camshaft, a gas flow in the direction of rotation, the slinging of oil droplets or even prevents the injection of an oil jet to a certain extent.
  • large oil droplets and splashes can not follow the rotation of the splash guard to the same extent as the blow-by gas.
  • oil droplets and splashes are deposited during rotation of the camshaft due to their inertia reinforced on the projections, while the blowby gas follow the rotational movement and can flow into the passages.
  • centrifugal separator which is mounted on a hollow camshaft and causes a separation of oil from blow-by gas.
  • the deposition occurs by the combination of a labyrinthine path with the generation of centrifugal forces.
  • the inflowing blowby gas is set in rotation whereby oil droplets can precipitate on rotating separation elements and be thrown radially outwards.
  • the splash guard In the known camshaft assemblies with a discharge of the blow-by gas through a hollow shaft portion, the splash guard is firmly connected to the camshaft and rotates accordingly with the camshaft.
  • the rotation of the splash guard is also essential in the known embodiments for a targeted oil separation ( DE 10 2005 022 254 A1 and DE 10 2004 045 630 A1 ) or even for the splash guard itself ( DE 10 2011 000 458 A1 ). It is accepted that the total rotating mass is increased, which also imbalances must be prevented by the other components.
  • the present invention seeks to provide an alternative, particularly simple embodiment of a generic camshaft assembly.
  • the invention provides that the splash guard attached to the camshaft housing and that the camshaft with respect to the splash guard is rotatable.
  • the blow-by gas is discharged through the hollow shaft portion, the splash guard itself is attached to the camshaft housing.
  • the splash guard can be attached directly to a cylinder head, a cylinder head cover, a bearing bracket or other fixed devices that are considered within the scope of the invention as part of the housing for the rotatable camshaft.
  • the splash guard is mounted fixed to the housing in contrast to the known embodiments, wherein the camshaft is rotatable relative to the housing-mounted splash guard.
  • the housing-mounted spray protection device can also be shaped so that a pre-separation is effected, wherein in the context of such a configuration, a liquid discharge from the splash guard is necessary out.
  • a pre-separation can be done for example by deflecting the air flow at bends, baffles or panels.
  • there may also be a mesh or the like.
  • a seal for sealing a gap between the splash guard and the camshaft is arranged according to a preferred embodiment of the invention along the longitudinal direction before and / or behind the at least one radial inlet opening.
  • a kind of labyrinth seal can be provided.
  • the camshaft can be provided on its outer side with a circumferential groove into which a projection of the splash guard intervenes.
  • the labyrinth seal forms a non-contact gap seal.
  • a separate sealing element in particular a felt ring, are used between the splash guard and the camshaft.
  • a separate sealing element in particular a felt ring, are used between the splash guard and the camshaft.
  • centrifugal discs or thickenings which cover the radial gap between the splash guard and the camshaft laterally. An existing on the outside of the camshaft oil film is then held by the centrifugal discs or thickening or thrown outwards and so can not penetrate into the radial gap between splash guard and camshaft.
  • the splash guard surrounds the camshaft circumferentially according to a preferred embodiment of the invention.
  • the at least one radial inlet opening is surrounded by a cavity of the splash guard, wherein the cavity in the longitudinal direction seen before and after the at least one inlet opening of radially or obliquely away from the camshaft side walls is limited. These side walls ensure that oil splashes can not get directly to the at least one radial inlet opening.
  • a portion of the splash guard which limits an inflow of the splash guard, extending in the longitudinal direction via at least one functional element of the camshaft arranged laterally to the inlet opening.
  • the portion of the splash guard may extend over cams, which are arranged laterally, that is, seen in the longitudinal direction in front of and behind the at least one inlet opening. Oil thrown away by these functional elements is retained directly by the splash guard and can not reach the inflow port.
  • the inflow channel may in particular be formed between the described section of the splash guard and an upper housing wall, in particular a cylinder head cover.
  • the splash guard can be arranged on the camshaft or about the camshaft, this is preferably designed in several parts, in particular in two parts.
  • the splash guard can for example be composed of an upper part and a lower part.
  • the upper part and the lower part are then connected together in a suitable manner, for example by screws or a latching connection.
  • the upper part and the lower part are fastened separately from one another at different points of the camshaft housing and only rest on one another.
  • the splash guard or the parts of the splash guard can also be formed as sections of the camshaft housing.
  • an upper part of the splash guard can be made in one piece with the cylinder head cover and a lower part of the splash guard in one piece with the cylinder head.
  • particularly preferred is an embodiment in which the splash guard is made separately or is formed from separately manufactured parts, because then a particularly simple and inexpensive production is possible.
  • the fixed splash guard is not subject to rotation and high mechanical loads.
  • a plastic can be used as a material for the splash guard.
  • liquid separated from the blowby gas can accumulate, which then has to be removed. This is particularly the case when the splash guard due to their structure also acts as a pre-separator.
  • the splash guard may have, for example, on its underside an outlet for accumulated liquid.
  • the outlet opening can also be provided with a valve. It may be a simple elastically clamped plate or the like, which can easily open automatically with a certain fluid accumulation within the splash guard.
  • valve is closed in the operation of the internal combustion engine in the formation of blow-by gas, in which case there is a discharge of the accumulated liquid with the internal combustion engine.
  • a sufficiently large reservoir within the splash guard is provided to prevent overflow of the reservoir and an entry of liquid into the camshaft.
  • the splash guard is to be suitably connected to the camshaft housing.
  • a simple fastening can be done by screws, but of course other positive and / or positive and / or cohesive connections are possible.
  • the invention also provides a camshaft assembly according to claim 11, which comprises the camshaft and the splash guard and which is intended for installation in the camshaft assembly described above.
  • the Fig. 1 shows a camshaft assembly with a camshaft 1 and a camshaft housing, which is formed by a cylinder head cover 2 and a cylinder head 3.
  • the camshaft 1 is rotatably supported in a known manner in the camshaft housing about a longitudinal direction x.
  • the camshaft 1 has a plurality of cams 4, with which in the cylinder head 3 guided inlet and outlet valves are opened and closed. Since these valves are not completely sealed, forms within the closed camshaft housing, a so-called blow-by gas, which is dissipate from the camshaft housing.
  • the blow-by gas is discharged through a hollow portion of the camshaft 1 (see FIG Fig. 3 ). It is to be avoided that spray oil, so from the rotatable parts, in particular the cam 4 slinged oil splash, reach radial inlet openings 5 of the hollow shaft portion.
  • a splash guard 6 is disposed within the camshaft housing in the region of the radial inlet openings 5, which is fixed to the housing housing fixed to the camshaft housing, wherein the camshaft 1 is also rotatable relative to the splash guard 6.
  • the Fig. 2 shows a camshaft assembly, which consists of the camshaft 1 and the splash guard 6.
  • the splash guard 6 is off an upper part 7 and a lower part 8 assembled.
  • the attachment of upper part 7 and lower part 8 to each other and the attachment of the entire splash guard 6 to the camshaft housing can be done by screws.
  • the Fig. 3 shows a possible attachment of the splash guard 6 to the cylinder head cover 2, wherein the Fig. 1 in an otherwise matching embodiment, the attachment of the splash guard 6 to the cylinder head 3 shows.
  • Fig. 3 surrounds the splash guard 6, the camshaft 1 circumferentially with a cavity which is seen in the longitudinal direction x before and behind the inlet openings 5 of radially extending away from the camshaft 1 side walls bounded.
  • the inflow passage 10 extends in the longitudinal direction x over the cam 4 adjoining on both sides. Oil thrown away by this cam 4 is stopped directly by the splash guard 6 and thus can not reach the inflow passage 10.
  • the camshaft 1 seen in the longitudinal direction x before and behind the inlet openings 5, a groove 11 into which the side walls of the splash guard 6 engage.
  • This embodiment provides a non-contact gap seal in the manner of a labyrinth seal. An oil film that is located on the camshaft, so can not get along the camshaft 1 to the inlet openings 5.
  • the housing-mounted spray protection device 6 therefore has a reservoir 12 with an outlet opening 13 in the illustrated installation state in its lower region. So that no blowby gas or even oil splashes pass uncontrollably through the outlet opening 13 into the splash guard 6, the outlet opening 13 is closed by a valve 14 in the form of an elastically movable plate.
  • FIGS. 4A to 4C show alternative embodiments for a seal between the camshaft 1 and the splash guard 6.
  • an additional sealing element 15 is provided in the form of a sealing ring, in particular in the form of a felt ring.
  • Fig. 4B is seen in the longitudinal direction x immediately before and behind the splash guard 6 each have a centrifugal disc 16 which is fixedly connected to the camshaft 1. It results in the rotation of the camshaft 1 there is an increased centrifugal force, so that an oil film on the outer surface of the camshaft 1 can not reach the radial gap between the splash guard 6 and camshaft 1 and optionally is thrown radially.
  • a matching effect can be achieved if, according to the Fig. 4C the camshaft 1 itself is provided immediately before and behind the splash guard 6 with a circumferential thickening 17.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Description

Die vorliegende Erfindung betrifft eine Nockenwellenbaugruppe mit einem Nockenwellengehäuse und einer um eine Längsrichtung drehbar in dem Nockenwellengehäuse gelagerten Nockenwelle, wobei die Nockenwelle einen hohlen Wellenabschnitt mit zumindest einer radialen Eintrittsöffnung zur Abführung eines Gases durch den hohlen Wellenabschnitt aufweist und wobei im Bereich der zumindest einen radialen Eintrittsöffnung eine Spritzschutzeinrichtung angeordnet ist. Gegenstand der Erfindung ist auch eine Nockenwellenanordnung, welche die Nockenwelle und die Spritzschutzeinrichtung aufweist und welche für den Einbau in das Nockenwellengehäuse vorgesehen ist.The present invention relates to a camshaft assembly having a camshaft housing and a camshaft rotatably mounted about a longitudinal direction in the camshaft housing, wherein the camshaft has a hollow shaft portion with at least one radial inlet opening for discharging a gas through the hollow shaft portion and wherein in the region of the at least one radial inlet opening a splash guard is arranged. The subject matter of the invention is also a camshaft arrangement which has the camshaft and the splashguard device and which is provided for installation in the camshaft housing.

Bei Verbrennungsmotoren mit von einer Nockenwelle angetriebenen Ventilen werden in der Praxis zwischen Zylinderwand und Kolben sowie an den einzelnen Ventilen Leckageverluste beobachtet, die auf eine nicht vollständige Abdichtung zurückzuführen sind. Diese Leckageverluste werden als Blowby-Gas bezeichnet und enthalten einen erheblichen Anteil an Öl. Bei Verbrennungsmotoren ist es deshalb üblich, das in dem Nockenwellengehäuse anfallende Blowby-Gas zurück in den Ansaugtrakt des Verbrennungsmotors zu leiten. Um einerseits den Verlust an Öl durch Blowby-Gas zu minimieren und andererseits eine optimale Verbrennung und eine minimale Umweltbelastung zu gewährleisten, ist es bekannt, das Blowby-Gas einer Ölabscheidung zu unterziehen und das abgeschiedene Öl zurück in den Ölkreislauf zu führen.In internal combustion engines with valves driven by a camshaft leakage losses are observed in practice between the cylinder wall and the piston as well as to the individual valves, which are due to an incomplete seal. These leakage losses are referred to as blowby gas and contain a significant amount of oil. In internal combustion engines, it is therefore customary to direct the blow-by gas accumulating in the camshaft housing back into the intake tract of the internal combustion engine. On the one hand to minimize the loss of oil by blow-by gas and on the other hand to ensure optimum combustion and minimum environmental impact, it is known to subject the blowby gas to oil separation and to pass the separated oil back into the oil circuit.

Das Blowby-Gas kann beispielsweise durch einen separaten Ölabscheider geführt werden, der in oder an dem Nockenwellengehäuse angeordnet ist. Die vorliegende Erfindung bezieht sich dagegen auf eine Ausgestaltung der Nockenwellenbaugruppe, bei der die Nockenwelle einen hohlen Wellenabschnitt mit zumindest einer radialen Eintrittsöffnung zur Abführung des Blowby-Gases durch den hohlen Wellenabschnitt hindurch aufweist. Eine zusätzliche Funktion der Nockenwelle ist damit also die Abführung des Blowby-Gases, wobei eine Ölabscheidung sowohl innerhalb des hohlen Wellenabschnittes als auch zusätzlich oder alternativ in dem weiteren Strömungsverlauf erfolgen kann. Gattungsgemäße Nockenwellenbaugruppen sind aus der DE 10 2005 022 254 A1 und DE 10 2011 000 458 A1 bekannt.For example, the blow-by gas may be passed through a separate oil separator located in or on the camshaft housing. The present invention, on the other hand, relates to an embodiment of the camshaft assembly in which the camshaft has a hollow shaft portion Having at least one radial inlet opening for discharging the blowby gas through the hollow shaft portion therethrough. An additional function of the camshaft is therefore the discharge of the blow-by gas, wherein an oil separation can take place both within the hollow shaft section and additionally or alternatively in the further flow course. Generic camshaft assemblies are from the DE 10 2005 022 254 A1 and DE 10 2011 000 458 A1 known.

Bei der Abführung des Blowby-Gases durch die Nockenwelle hindurch ist zu vermeiden, dass zusätzlich zu dem ohnehin in dem Blowby-Gas enthaltenen Öl von den Elementen der Nockenwelle aufgeschleuderte Ölspritzer bis zu der zumindest einen radialen Eintrittsöffnung des hohlen Wellenabschnittes gelangen. Bei einer gattungsgemäßen Nockenwellenbaugruppe werden die Nocken und von den Nocken angetriebene Schlepphebel gezielt beölt, wobei sich an den rotierenden Komponenten des Ventiltriebs, also insbesondere an den Nocken, Ölspritzer ergeben können, welche auch als Spritzöl bezeichnet wird. Ohne eine geeignete Abschottung der radialen Eintrittsöffnung des hohlen Wellenabschnittes kann das Spritzöl direkt in den hohlen Wellenabschnitt gelangen und die Abscheideleistung eines dort integrierten oder nachgelagerten Ölabscheidersystems negativ beeinflussen oder sogar zu einer Überlastung des Systems führen.During the discharge of the blow-by gas through the camshaft, it is to be avoided that, in addition to the oil already contained in the blow-by gas, oil spattered by the elements of the camshaft reach the at least one radial inlet opening of the hollow shaft section. In a generic camshaft assembly, the cams and cam followers driven by the cams are specifically oiled, whereby oil spatter may result on the rotating components of the valve gear, that is, in particular on the cams, which is also referred to as spray oil. Without a suitable partitioning of the radial inlet opening of the hollow shaft section, the spray oil can pass directly into the hollow shaft section and adversely affect the separation efficiency of an integrated or downstream Ölabscheidersystems or even lead to an overload of the system.

Gemäß der DE 10 2005 022 254 A1 ist auf der Nockenwelle ein Vorabscheider angeordnet, der radiale Eintrittsöffnungen teilweise verdeckt und damit auch eine Spritzschutzeinrichtung bildet. Zusätzlich wird durch die rotierende Bewegung des Vorabscheiders auch das zugeführte Blowby-Gas in Rotation versetzt, wodurch sich in dem Blowby-Gas enthaltene Tröpfchen zumindest zu einem Teil an der Innenwand des Vorabscheiders niederschlagen können.According to the DE 10 2005 022 254 A1 is arranged on the camshaft, a pre-separator, the radial inlet openings partially covered and thus forms a splash guard. In addition, the supplied blowby gas is set in rotation by the rotating movement of the pre-separator, whereby droplets contained in the blowby gas can be at least partly precipitated on the inner wall of the pre-separator.

Gemäß der DE 10 2011 000 458 A1 ist auf der Nockenwelle eine Spritzschutzeinrichtung angeordnet, die einen radial freiliegenden Mantel mit radialen Durchtrittsöffnungen und Vorsprüngen zwischen den Durchtrittsöffnungen aufweist. Die Vorsprünge erzeugen bei der Drehung der Nockenwelle einen Gasstrom in Drehrichtung, der das Einschleudern von Öltröpfchen oder sogar das Einspritzen eines Ölstrahls in einem gewissen Maße verhindert. Des Weiteren ist zu berücksichtigen, dass große Öltröpfchen und -spritzer der Drehung der Spritzschutzeinrichtung nicht in gleichem Maße folgen können wie das Blowby-Gas. So werden also Öltröpfchen und -spritzer bei der Drehung der Nockenwelle aufgrund ihrer Masseträgheit verstärkt an den Vorsprüngen abgeschieden, während das Blowby-Gas der Drehbewegung folgen und in die Durchtrittsöffnungen einströmen kann.According to the DE 10 2011 000 458 A1 is arranged on the camshaft, a splash guard, which has a radially exposed jacket with radial passage openings and projections between the passage openings. The projections produce upon rotation of the camshaft, a gas flow in the direction of rotation, the slinging of oil droplets or even prevents the injection of an oil jet to a certain extent. Furthermore, it should be noted that large oil droplets and splashes can not follow the rotation of the splash guard to the same extent as the blow-by gas. Thus, oil droplets and splashes are deposited during rotation of the camshaft due to their inertia reinforced on the projections, while the blowby gas follow the rotational movement and can flow into the passages.

Aus der DE 10 2004 045 630 A1 ist ein Zentrifugalabscheider bekannt, der auf eine hohle Nockenwelle aufgesetzt ist und eine Abscheidung von Öl aus Blowby-Gas bewirkt. Die Abscheidung erfolgt durch die Kombination eines labyrinthischen Weges mit der Erzeugung von Zentrifugalkräften. Das zuströmende Blowby-Gas wird in Rotation versetzt, wobei sich dabei Öltröpfchen an rotierenden Abscheideelementen niederschlagen können und radial nach außen geschleudert werden.From the DE 10 2004 045 630 A1 a centrifugal separator is known, which is mounted on a hollow camshaft and causes a separation of oil from blow-by gas. The deposition occurs by the combination of a labyrinthine path with the generation of centrifugal forces. The inflowing blowby gas is set in rotation whereby oil droplets can precipitate on rotating separation elements and be thrown radially outwards.

Bei den bekannten Nockenwellenbaugruppen mit einer Abführung des Blowby-Gases durch einen hohlen Wellenabschnitt ist die Spritzschutzeinrichtung fest mit der Nockenwelle verbunden und dreht sich entsprechend mit der Nockenwelle. Die Rotation der Spritzschutzeinrichtung ist bei den bekannten Ausführungen auch wesentlich für eine bezweckte Ölabscheidung ( DE 10 2005 022 254 A1 und DE 10 2004 045 630 A1 ) oder sogar für den Spritzschutz an sich ( DE 10 2011 000 458 A1 ). Dabei wird in Kauf genommen, dass die insgesamt rotierende Masse erhöht wird, wobei auch Unwuchten durch die weiteren Komponenten verhindert werden müssen.In the known camshaft assemblies with a discharge of the blow-by gas through a hollow shaft portion, the splash guard is firmly connected to the camshaft and rotates accordingly with the camshaft. The rotation of the splash guard is also essential in the known embodiments for a targeted oil separation ( DE 10 2005 022 254 A1 and DE 10 2004 045 630 A1 ) or even for the splash guard itself ( DE 10 2011 000 458 A1 ). It is accepted that the total rotating mass is increased, which also imbalances must be prevented by the other components.

Vor diesem Hintergrund liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine alternative, besonders einfache Ausgestaltung einer gattungsgemäßen Nockenwellenbaugruppe anzugeben.Against this background, the present invention seeks to provide an alternative, particularly simple embodiment of a generic camshaft assembly.

Gegenstand der Erfindung und Lösung der Aufgabe ist eine Nockenwellenbaugruppe gemäß Patentanspruch 1.The object of the invention and solution of the problem is a camshaft assembly according to claim 1.

Ausgehend von einer Nockenwellenbaugruppe mit den eingangs beschriebenen Merkmalen ist erfindungsgemäß vorgesehen, dass die Spritzschutzeinrichtung an dem Nockenwellengehäuse befestigt und dass die der Nockenwelle gegenüber der Spritzschutzeinrichtung drehbar ist. Obwohl auch gemäß der vorliegenden Erfindung das Blowby-Gas durch den hohlen Wellenabschnitt abgeführt wird, ist die Spritzschutzeinrichtung selbst an den Nockenwellengehäuse befestigt.Starting from a camshaft assembly with the features described above, the invention provides that the splash guard attached to the camshaft housing and that the camshaft with respect to the splash guard is rotatable. Although according to the present invention, the blow-by gas is discharged through the hollow shaft portion, the splash guard itself is attached to the camshaft housing.

Insbesondere kann die Spritzschutzeinrichtung direkt an einem Zylinderkopf, einer Zylinderkopfhaube, einer Lagerbrücke oder anderen feststehenden Einrichtungen befestigt sein, die im Rahmen der Erfindung als Bestandteil des Gehäuses für die drehbare Nockenwelle angesehen werden. Erfindungswesentlich ist, dass die Spritzschutzeinrichtung im Gegensatz zu den bekannten Ausführungsformen gehäusefest montiert ist, wobei die Nockenwelle entsprechend gegenüber der gehäusefesten Spritzschutzeinrichtung drehbar ist.In particular, the splash guard can be attached directly to a cylinder head, a cylinder head cover, a bearing bracket or other fixed devices that are considered within the scope of the invention as part of the housing for the rotatable camshaft. Is essential to the invention that the splash guard is mounted fixed to the housing in contrast to the known embodiments, wherein the camshaft is rotatable relative to the housing-mounted splash guard.

Die gehäusefest angeordnete Spritzschutzeinrichtung kann auch so geformt sein, dass eine Vorabscheidung bewirkt wird, wobei im Rahmen einer solchen Ausgestaltung auch eine Flüssigkeitsabfuhr aus der Spritzschutzeinrichtung heraus notwendig ist. Eine Vorabscheidung kann beispielsweise durch ein Umlenken des Luftstroms an Abwinklungen, Prallplatten oder Blenden erfolgen. Darüber hinaus kann in dem Strömungsweg zur Abscheidung des im Blowby-Gas enthaltenen Öls auch ein Gitter oder dergleichen vorhanden sein.The housing-mounted spray protection device can also be shaped so that a pre-separation is effected, wherein in the context of such a configuration, a liquid discharge from the splash guard is necessary out. A pre-separation can be done for example by deflecting the air flow at bends, baffles or panels. Moreover, in the flow path for separating the oil contained in the blow-by gas, there may also be a mesh or the like.

Damit das Blowby-Gas in kontrollierter Weise durch die Spritzschutzeinrichtung geleitet wird, ist gemäß einer bevorzugten Ausgestaltung der Erfindung entlang der Längsrichtung gesehen vor und/oder hinter der zumindest einen radialen Eintrittsöffnung eine Dichtung zur Abdichtung eines Spaltes zwischen der Spritzschutzeinrichtung und der Nockenwelle angeordnet. Beispielsweise kann eine Art Labyrinthdichtung vorgesehen werden. Zur Erzeugung einer solchen Labyrinthstruktur kann die Nockenwelle an ihrer Außenseite mit einer umlaufenden Nut versehen werden, in die ein Vorsprung der Spritzschutzeinrichtung eingreift. Die Labyrinthdichtung bildet dabei eine berührungslose Spaltdichtung.Thus, the blow-by gas is passed in a controlled manner through the splash guard, a seal for sealing a gap between the splash guard and the camshaft is arranged according to a preferred embodiment of the invention along the longitudinal direction before and / or behind the at least one radial inlet opening. For example, a kind of labyrinth seal can be provided. To produce such a labyrinth structure, the camshaft can be provided on its outer side with a circumferential groove into which a projection of the splash guard intervenes. The labyrinth seal forms a non-contact gap seal.

Zusätzlich oder alternativ kann zwischen der Spritzschutzeinrichtung und der Nockenwelle auch ein separates Dichtelement, insbesondere ein Filzring, eingesetzt werden. Des Weiteren besteht auch die Möglichkeit, an der Nockenwelle unmittelbar vor und hinter der Spritzschutzeinrichtung separate Schleuderscheiben oder Verdickungen vorzusehen, welche den radialen Spalt zwischen der Spritzschutzeinrichtung und der Nockenwelle seitlich verdecken. Ein an der Außenseite der Nockenwelle vorhandener Ölfilm wird dann von den Schleuderscheiben oder Verdickungen aufgehalten bzw. nach außen geschleudert und kann so nicht in den radialen Spalt zwischen Spritzschutzeinrichtung und Nockenwelle eindringen.Additionally or alternatively, between the splash guard and the camshaft, a separate sealing element, in particular a felt ring, are used. Furthermore, it is also possible to provide on the camshaft immediately before and behind the splash guard separate centrifugal discs or thickenings, which cover the radial gap between the splash guard and the camshaft laterally. An existing on the outside of the camshaft oil film is then held by the centrifugal discs or thickening or thrown outwards and so can not penetrate into the radial gap between splash guard and camshaft.

Die Spritzschutzeinrichtung umgreift gemäß einer bevorzugten Ausgestaltung der Erfindung die Nockenwelle umfangsseitig. Insbesondere kann vorgesehen sein, dass die zumindest eine radiale Eintrittsöffnung mit einem Hohlraum der Spritzschutzeinrichtung umgeben ist, wobei der Hohlraum in Längsrichtung gesehen vor und hinter der zumindest einen Eintrittsöffnung von sich radial oder schräg von der Nockenwelle wegerstreckenden Seitenwänden begrenzt ist. Diese Seitenwände gewährleisten, dass Ölspritzer nicht direkt zu der zumindest einen radialen Eintrittsöffnung gelangen können.The splash guard surrounds the camshaft circumferentially according to a preferred embodiment of the invention. In particular, it may be provided that the at least one radial inlet opening is surrounded by a cavity of the splash guard, wherein the cavity in the longitudinal direction seen before and after the at least one inlet opening of radially or obliquely away from the camshaft side walls is limited. These side walls ensure that oil splashes can not get directly to the at least one radial inlet opening.

Um einen besonders effektiven und zuverlässigen Spritzschutz zu erreichen, ist gemäß einer bevorzugten Ausgestaltung der Erfindung vorgesehen, dass ein Abschnitt der Spritzschutzeinrichtung, der einen Einströmkanal der Spritzschutzeinrichtung begrenzt, sich in Längsrichtung über zumindest ein seitlich zu der Eintrittsöffnung angeordnetes Funktionselement der Nockenwelle erstreckt. Insbesondere kann der Abschnitt der Spritzschutzeinrichtung sich über Nocken erstrecken, welche seitlich, das heißt in Längsrichtung gesehen vor und hinter der zumindest einen Eintrittsöffnung angeordnet sind. Von diesen Funktionselementen fortgeschleudertes Öl wird direkt von der Spritzschutzeinrichtung zurückgehalten und kann nicht zu dem Einströmkanal gelangen.In order to achieve a particularly effective and reliable splash guard, it is provided according to a preferred embodiment of the invention that a portion of the splash guard, which limits an inflow of the splash guard, extending in the longitudinal direction via at least one functional element of the camshaft arranged laterally to the inlet opening. In particular, the portion of the splash guard may extend over cams, which are arranged laterally, that is, seen in the longitudinal direction in front of and behind the at least one inlet opening. Oil thrown away by these functional elements is retained directly by the splash guard and can not reach the inflow port.

Der Einströmkanal kann insbesondere zwischen dem beschriebenen Abschnitt der Spritzschutzeinrichtung und einer oberen Gehäusewand, insbesondere einer Zylinderkopfhaube, gebildet sein.The inflow channel may in particular be formed between the described section of the splash guard and an upper housing wall, in particular a cylinder head cover.

Damit die Spritzschutzeinrichtung an der Nockenwelle bzw. um die Nockenwelle herum angeordnet werden kann, ist diese vorzugsweise mehrteilig, insbesondere zweiteilig ausgestaltet. Die Spritzschutzeinrichtung kann beispielsweise aus einem Oberteil und einem Unterteil zusammengesetzt werden. Das Oberteil und das Unterteil werden dann in geeigneter Weise, beispielsweise durch Schrauben oder eine Rastverbindung, miteinander verbunden. Grundsätzlich ist es auch möglich, dass das Oberteil und das Unterteil getrennt voneinander an verschiedenen Stellen des Nockenwellengehäuses befestigt sind und lediglich aufeinander aufliegen.So that the splash guard can be arranged on the camshaft or about the camshaft, this is preferably designed in several parts, in particular in two parts. The splash guard can for example be composed of an upper part and a lower part. The upper part and the lower part are then connected together in a suitable manner, for example by screws or a latching connection. In principle, it is also possible that the upper part and the lower part are fastened separately from one another at different points of the camshaft housing and only rest on one another.

Die Spritzschutzeinrichtung bzw. die Teile der Spritzschutzeinrichtung können auch als Abschnitte des Nockenwellengehäuses gebildet sein. Beispielsweise kann ein Oberteil der Spritzschutzeinrichtung einstückig mit der Zylinderkopfhaube und ein Unterteil der Spritzschutzeinrichtung einstückig mit dem Zylinderkopf gefertigt sein. Besonders bevorzugt ist jedoch eine Ausgestaltung, bei der die Spritzschutzeinrichtung separat gefertigt ist bzw. aus separat gefertigten Teilen gebildet wird, weil dann eine besonders einfache und kostengünstige Herstellung möglich ist.The splash guard or the parts of the splash guard can also be formed as sections of the camshaft housing. For example, an upper part of the splash guard can be made in one piece with the cylinder head cover and a lower part of the splash guard in one piece with the cylinder head. However, particularly preferred is an embodiment in which the splash guard is made separately or is formed from separately manufactured parts, because then a particularly simple and inexpensive production is possible.

Dabei ist zu berücksichtigen, dass bis auf eine ausreichende Maßhaltigkeit und Abdichtung gegenüber der Nockenwelle keine hohen Anforderungen an die feststehende Spritzschutzeinrichtung zu stellen sind. Die feststehende Spritzschutzeinrichtung ist keiner Rotation und keinen großen mechanischen Belastungen ausgesetzt. Insbesondere ist ein Kunststoff als Material für die Spritzschutzeinrichtung einsetzbar.It should be noted that, except for a sufficient dimensional accuracy and sealing against the camshaft no high demands are placed on the fixed splash guard. The fixed splash guard is not subject to rotation and high mechanical loads. In particular, a plastic can be used as a material for the splash guard.

Innerhalb der Spritzschutzeinrichtung kann sich aus dem Blowby-Gas abgeschiedene Flüssigkeit ansammeln, die dann abzuführen ist. Dies ist in besonderem Maße dann der Fall, wenn die Spritzschutzeinrichtung aufgrund ihrer Struktur auch als Vorabscheider wirkt.Within the splash guard, liquid separated from the blowby gas can accumulate, which then has to be removed. This is particularly the case when the splash guard due to their structure also acts as a pre-separator.

Die Spritzschutzeinrichtung kann beispielsweise an ihrer Unterseite eine Auslassöffnung für angesammelte Flüssigkeit aufweisen. Um dann den unkontrollierten Eintritt von Blowby-Gas und Ölspritzern durch diese Auslassöffnung zu vermeiden, kann die Auslassöffnung auch mit einem Ventil versehen sein. Dabei kann es sich um ein einfaches elastisch eingespanntes Plättchen oder dergleichen handeln, welches bei einer gewissen Flüssigkeitsansammlung innerhalb der Spritzschutzeinrichtung leicht selbsttätig öffnen kann.The splash guard may have, for example, on its underside an outlet for accumulated liquid. In order then to avoid the uncontrolled entry of blowby gas and oil splashes through this outlet opening, the outlet opening can also be provided with a valve. It may be a simple elastically clamped plate or the like, which can easily open automatically with a certain fluid accumulation within the splash guard.

Beispielsweise kann vorgesehen sein, dass das Ventil im Betrieb des Verbrennungsmotors bei der Entstehung von Blowby-Gas verschlossen ist, wobei dann ein Abfließen der angesammelten Flüssigkeit bei stehendem Verbrennungsmotor erfolgt. Im Rahmen einer solchen Ausgestaltung ist jedoch ein ausreichend großes Reservoir innerhalb der Spritzschutzeinrichtung vorzusehen, um ein Überlaufen des Reservoirs und ein Eintritt von Flüssigkeit in die Nockenwelle zu vermeiden.For example, it can be provided that the valve is closed in the operation of the internal combustion engine in the formation of blow-by gas, in which case there is a discharge of the accumulated liquid with the internal combustion engine. In the context of such an embodiment, however, a sufficiently large reservoir within the splash guard is provided to prevent overflow of the reservoir and an entry of liquid into the camshaft.

Die Spritzschutzeinrichtung ist auf geeignete Weise mit dem Nockenwellengehäuse zu verbinden. Beispielsweise kann eine einfache Befestigung durch Schrauben erfolgen, wobei aber selbstverständlich auch andere form- und/oder kraft- und/oder stoffschlüssige Verbindungen möglich sind.The splash guard is to be suitably connected to the camshaft housing. For example, a simple fastening can be done by screws, but of course other positive and / or positive and / or cohesive connections are possible.

Gegenstand der Erfindung ist auch eine Nockenwellenanordnung gemäß Patentanspruch 11, welche die Nockenwelle und die Spritzschutzeinrichtung umfasst und welche für den Einbau in die zuvor beschriebene Nockenwellenbaugruppe vorgesehen ist.The invention also provides a camshaft assembly according to claim 11, which comprises the camshaft and the splash guard and which is intended for installation in the camshaft assembly described above.

Die Erfindung wird im Folgenden anhand einer lediglich ein Ausführungsbeispiel darstellenden Zeichnung erläutert. Es zeigen:

Fig. 1
eine Nockenwellenbaugruppe,
Fig. 2
eine Nockenwellenanordnung bestehend aus Nockenwelle und Spritzschutzeinrichtung als Bestandteil der Nockenwellenbaugruppe gemäß Fig. 1,
Fig. 3
eine Schnittdarstellung durch eine Nockenwellenbaugruppe entsprechend der Fig. 1, jedoch mit einer anderen Art der Befestigung.
Fig. 4A bis Fig. 4C
Alternative Ausgestaltungen einer Abdichtung zwischen einer Nockenwelle und einer Spritzschutzeinrichtung.
The invention will be explained in the following with reference to a drawing showing only one exemplary embodiment. Show it:
Fig. 1
a camshaft assembly,
Fig. 2
a camshaft assembly consisting of camshaft and splash guard as part of the camshaft assembly according to Fig. 1 .
Fig. 3
a sectional view through a camshaft assembly according to the Fig. 1 but with a different type of attachment.
Fig. 4A to Fig. 4C
Alternative embodiments of a seal between a camshaft and a splash guard.

Die Fig. 1 zeigt eine Nockenwellenbaugruppe mit einer Nockenwelle 1 und einem Nockenwellengehäuse, welches von einer Zylinderkopfhaube 2 und einem Zylinderkopf 3 gebildet ist. Die Nockenwelle 1 ist in bekannter Weise in dem Nockenwellengehäuse um eine Längsrichtung x drehbar gelagert.The Fig. 1 shows a camshaft assembly with a camshaft 1 and a camshaft housing, which is formed by a cylinder head cover 2 and a cylinder head 3. The camshaft 1 is rotatably supported in a known manner in the camshaft housing about a longitudinal direction x.

Die Nockenwelle 1 weist eine Vielzahl von Nocken 4 auf, mit denen in dem Zylinderkopf 3 geführte Ein- und Auslassventile geöffnet und geschlossen werden. Da diese Ventile nicht vollständig abgedichtet sind, bildet sich innerhalb des geschlossenen Nockenwellengehäuses ein so genanntes Blowby-Gas, welches aus dem Nockenwellengehäuse abzuführen ist.The camshaft 1 has a plurality of cams 4, with which in the cylinder head 3 guided inlet and outlet valves are opened and closed. Since these valves are not completely sealed, forms within the closed camshaft housing, a so-called blow-by gas, which is dissipate from the camshaft housing.

Gemäß der vorliegenden Erfindung wird das Blowby-Gas durch einen hohlen Abschnitt der Nockenwelle 1 abgeführt (siehe Fig. 3). Dabei ist zu vermeiden, dass Spritzöl, also von den drehbaren Teilen, insbesondere den Nocken 4 aufgeschleuderte Ölspritzer, zu radialen Eintrittsöffnungen 5 des hohlen Wellenabschnittes gelangen. Zu diesem Zweck ist innerhalb des Nockenwellengehäuses im Bereich der radialen Eintrittsöffnungen 5 eine Spritzschutzeinrichtung 6 angeordnet, die erfindungsgemäß gehäusefest an dem Nockenwellengehäuse befestigt ist, wobei die Nockenwelle 1 entsprechend auch gegenüber der Spritzschutzeinrichtung 6 drehbar ist.According to the present invention, the blow-by gas is discharged through a hollow portion of the camshaft 1 (see FIG Fig. 3 ). It is to be avoided that spray oil, so from the rotatable parts, in particular the cam 4 slinged oil splash, reach radial inlet openings 5 of the hollow shaft portion. For this purpose, a splash guard 6 is disposed within the camshaft housing in the region of the radial inlet openings 5, which is fixed to the housing housing fixed to the camshaft housing, wherein the camshaft 1 is also rotatable relative to the splash guard 6.

Die Fig. 2 zeigt eine Nockenwellenanordnung, welche aus der Nockenwelle 1 und der Spritzschutzeinrichtung 6 besteht. Die Spritzschutzeinrichtung 6 ist aus einem Oberteil 7 und einem Unterteil 8 zusammengesetzt. Die Befestigung von Oberteil 7 und Unterteil 8 aneinander sowie die Befestigung der gesamten Spritzschutzeinrichtung 6 an dem Nockenwellengehäuse kann über Schrauben erfolgen. Die Fig. 3 zeigt eine mögliche Befestigung der Spritzschutzeinrichtung 6 an der Zylinderkopfhaube 2, wobei die Fig. 1 bei einer ansonsten übereinstimmenden Ausgestaltung die Befestigung der Spritzschutzeinrichtung 6 an dem Zylinderkopf 3 zeigt. Darüber hinaus ist beispielsweise auch eine Gehäusefestebefestigung an den in Fig. 1 dargestellten Lagerbrücken möglichThe Fig. 2 shows a camshaft assembly, which consists of the camshaft 1 and the splash guard 6. The splash guard 6 is off an upper part 7 and a lower part 8 assembled. The attachment of upper part 7 and lower part 8 to each other and the attachment of the entire splash guard 6 to the camshaft housing can be done by screws. The Fig. 3 shows a possible attachment of the splash guard 6 to the cylinder head cover 2, wherein the Fig. 1 in an otherwise matching embodiment, the attachment of the splash guard 6 to the cylinder head 3 shows. In addition, for example, a housing fixing to the in Fig. 1 illustrated bearing bridges possible

Gemäß der Fig. 3 umgreift die Spritzschutzeinrichtung 6 die Nockenwelle 1 umfangsseitig mit einem Hohlraum, der in Längsrichtung x gesehen vor und hinter den Eintrittsöffnungen 5 von sich radial von der Nockenwelle 1 weg erstreckenden Seitenwänden begrenzt ist.According to the Fig. 3 surrounds the splash guard 6, the camshaft 1 circumferentially with a cavity which is seen in the longitudinal direction x before and behind the inlet openings 5 of radially extending away from the camshaft 1 side walls bounded.

An diese radial nach außen geführten Seitenwände schließt sich an dem Oberteil 7 eine Abwinklung an, wobei dort ein Abschnitt 9 der Spritzschutzeinrichtung 6 anschließt, der einen Einströmkanal 10 begrenzt.At this radially outwardly guided side walls adjoins the upper part 7 a bend, where there is a section 9 of the splash guard 6 connects, which limits an inflow passage 10.

Der Einströmkanal 10 erstreckt sich in Längsrichtung x über die an beiden Seiten angrenzenden Nocken 4. Von diesem Nocken 4 weggeschleudertes Öl wird direkt von der Spritzschutzeinrichtung 6 aufgehalten und kann so nicht zu dem Einströmkanal 10 gelangen.The inflow passage 10 extends in the longitudinal direction x over the cam 4 adjoining on both sides. Oil thrown away by this cam 4 is stopped directly by the splash guard 6 and thus can not reach the inflow passage 10.

Da sich die Nockenwelle 1 gegenüber der Spritzschutzeinrichtung 6 dreht, ist eine geeignete Abdichtung eines radialen Spaltes zwischen der Spritzschutzeinrichtung 6 und der Nockenwelle 1 vorzusehen.Since the camshaft 1 rotates with respect to the splash guard 6, a suitable seal of a radial gap between the splash guard 6 and the camshaft 1 is provided.

Gemäß der Fig. 3 weist die Nockenwelle 1 in Längsrichtung x gesehen vor und hinter den Eintrittsöffnungen 5 eine Nut 11 auf, in die die Seitenwände der Spritzschutzeinrichtung 6 eingreifen. Durch diese Ausgestaltung wird eine berührungslose Spaltdichtung nach Art einer Labyrinthdichtung bereitgestellt. Ein Ölfilm, der sich auf der Nockenwelle befindet, kann so nicht entlang der Nockenwelle 1 zu den Eintrittsöffnungen 5 gelangen.According to the Fig. 3 the camshaft 1 seen in the longitudinal direction x before and behind the inlet openings 5, a groove 11 into which the side walls of the splash guard 6 engage. This embodiment provides a non-contact gap seal in the manner of a labyrinth seal. An oil film that is located on the camshaft, so can not get along the camshaft 1 to the inlet openings 5.

Innerhalb der Spritzschutzeinrichtung 6 kann sich über den Betrieb Flüssigkeit ansammeln. Insbesondere können auch in der Fig. 3 nicht dargestellte Einrichtungen für eine Vorabscheidung in die Spritzschutzeinrichtung 6 integriert sein, wodurch der Anfall an Öl innerhalb der Spritzschutzeinrichtung 6 noch erhöht ist. Die gehäusefest angeordnete Spritzschutzeinrichtung 6 weist deshalb in dem dargestellten Einbauzustand in ihrem unteren Bereich ein Reservoir 12 mit einer Auslassöffnung 13 auf. Damit kein Blowby-Gas oder auch Ölspritzer durch die Auslassöffnung 13 unkontrolliert in die Spritzschutzeinrichtung 6 gelangen, ist die Auslassöffnung 13 mit einem Ventil 14 in Form eines elastisch beweglichen Plättchens verschlossen.Within the splash guard 6 can accumulate on the operation of liquid. In particular, also in the Fig. 3 not shown devices for a pre-separation be integrated into the splash guard 6, whereby the accumulation of oil within the splash guard 6 is still increased. The housing-mounted spray protection device 6 therefore has a reservoir 12 with an outlet opening 13 in the illustrated installation state in its lower region. So that no blowby gas or even oil splashes pass uncontrollably through the outlet opening 13 into the splash guard 6, the outlet opening 13 is closed by a valve 14 in the form of an elastically movable plate.

Die Figuren 4A bis 4C zeigen alternative Ausgestaltungen für eine Abdichtung zwischen der Nockenwelle 1 und der Spritzschutzeinrichtung 6. Gemäß der Fig. 4A ist ein zusätzliches Dichtelement 15 in Form eines Dichtungsringes, insbesondere in Form eines Filzringes vorgesehen.The FIGS. 4A to 4C show alternative embodiments for a seal between the camshaft 1 and the splash guard 6. According to the Fig. 4A an additional sealing element 15 is provided in the form of a sealing ring, in particular in the form of a felt ring.

Gemäß der Fig. 4B ist in Längsrichtung x gesehen unmittelbar vor und hinter der Spritzschutzeinrichtung 6 jeweils eine Schleuderscheibe 16 angeordnet, welche fest mit der Nockenwelle 1 verbunden ist. Es ergibt sich bei der Rotation der Nockenwelle 1 dort eine erhöhte Zentrifugalkraft, so dass ein Ölfilm an dem Außenmantel der Nockenwelle 1 nicht zu dem radialen Spalt zwischen Spritzschutzeinrichtung 6 und Nockenwelle 1 gelangen kann und gegebenenfalls radial weggeschleudert wird.According to the Fig. 4B is seen in the longitudinal direction x immediately before and behind the splash guard 6 each have a centrifugal disc 16 which is fixedly connected to the camshaft 1. It results in the rotation of the camshaft 1 there is an increased centrifugal force, so that an oil film on the outer surface of the camshaft 1 can not reach the radial gap between the splash guard 6 and camshaft 1 and optionally is thrown radially.

Ein übereinstimmender Effekt kann erreicht werden, wenn gemäß der Fig. 4C die Nockenwelle 1 selbst unmittelbar vor und hinter der Spritzschutzeinrichtung 6 mit einer umlaufenden Verdickung 17 versehen ist.A matching effect can be achieved if, according to the Fig. 4C the camshaft 1 itself is provided immediately before and behind the splash guard 6 with a circumferential thickening 17.

Claims (11)

  1. Camshaft assembly having a camshaft housing and a camshaft (1) which is mounted in the camshaft housing such that it can be rotated about a longitudinal direction (x), the camshaft (1) having a hollow shaft section with at least one radial inlet opening (5) for discharging a gas through the hollow shaft section, and a spray protection device (6) being arranged in the region of the at least one radial inlet opening (5), characterized in that the spray protection device (6) is fastened to the camshaft housing, and in that the camshaft (1) can be rotated with respect to the spray protection device (6).
  2. Camshaft assembly according to Claim 1, characterized in that a seal for sealing a gap between the spray protection device (6) and the camshaft (1) is arranged in front of and/or behind the at least one radial inlet opening (5) as viewed along the longitudinal direction (x).
  3. Camshaft assembly according to Claim 1 or 2, characterized in that the spray protection device (6) surrounds the at least one radial inlet opening (5) with a cavity which is delimited in front of and behind the at least one inlet opening (5) as viewed in the longitudinal direction (x) by side walls which extend radially or obliquely away from the camshaft (1).
  4. Camshaft assembly according to one of Claims 1 to 3, characterized in that a section (9) of the spray protection device (6) which delimits an inflow duct (10) of the spray protection device (6) extends in the longitudinal direction (x) over at least one functional element of the camshaft (1) which is arranged laterally with respect to the inlet opening (5).
  5. Camshaft assembly according to Claim 4, characterized in that the inflow duct (10) is formed between the section (9) of the spray protection device (6) and an upper housing wall.
  6. Camshaft assembly according to one of Claims 1 to 5, characterized in that the spray protection device (6) is assembled from an upper part (7) and from a lower part (8).
  7. Camshaft assembly according to one of Claims 1 to 6, characterized in that the spray protection device (6) reaches around the camshaft (1) on the circumferential side.
  8. Camshaft assembly according to one of Claims 1 to 7, characterized in that, on its underside, the spray protection device (6) has an outlet opening (13) for collected liquid.
  9. Camshaft assembly according to Claim 8, characterized in that the outlet opening (13) is provided with a valve (14).
  10. Camshaft assembly according to one of Claims 1 to 9, characterized in that the spray protection device (6) is screwed to the camshaft housing.
  11. Camshaft arrangement for a camshaft assembly according to one of Claims 1 to 10, having a camshaft (1) which is provided for being arranged rotatably in a camshaft housing, the camshaft (1) having a hollow shaft section with at least one radial inlet opening (5) for discharging a gas through the hollow shaft section, and having a spray protection device (6) which is arranged in the region of the at least one radial inlet opening (5), characterized in that the spray protection device (6) is set up such that it can be rotated with respect to the camshaft (1) and for being arranged on the camshaft housing such that it cannot rotate.
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PCT/EP2014/002011 WO2015022050A1 (en) 2013-08-13 2014-07-23 Camshaft assembly and camshaft arrangement

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JPH04127807U (en) 1991-05-10 1992-11-20 三菱自動車工業株式会社 cam cap
JP2504073B2 (en) 1987-10-07 1996-06-05 三菱自動車工業株式会社 Camshaft with oil separator mechanism
DE102005022254A1 (en) 2005-05-10 2006-11-30 Mahle International Gmbh Centrifugal oil mist separator device for hollow camshaft, has oil mist pre-separator pre-mounted as pre-separator that is connected with camshaft in mist feeding opening, and twist producer provided as final separator within axial cavity
US7219629B2 (en) 2005-07-11 2007-05-22 Kawasaki Jukogyo Kabushiki Kaisha Breathing system in combustion engine
EP1845238A2 (en) 2006-03-20 2007-10-17 Mahle International GmbH Cylinder head of combustion engine
CN101270683A (en) 2007-10-30 2008-09-24 重庆长安汽车股份有限公司 Gas oil separation structure of internal combustion engine crankcase ventilation system
FR2933626A1 (en) 2008-07-10 2010-01-15 Filtrauto Gas separating device for case of internal combustion engine of road vehicle e.g. car, has liquid e.g. oil, draining channel arranged at side of treated gas downstream zone for flow of liquid passed through medium
DE102009012402A1 (en) 2009-03-10 2010-09-23 Thyssenkrupp Presta Teccenter Ag Shaft body with integrated oil separator
DE102011000458A1 (en) 2011-02-02 2012-08-02 Thyssenkrupp Presta Teccenter Ag Shaft, in particular camshaft with a hollow shaft section
US20120204723A1 (en) 2010-05-06 2012-08-16 Rolls-Royce Deutschland Ltd & Co Kg Centrifugal oil separator for an aircraft engine

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DE19931740C2 (en) * 1999-07-08 2001-06-13 Daimler Chrysler Ag Reciprocating internal combustion engine with a camshaft
DE102004045630A1 (en) 2004-09-21 2006-04-06 Daimlerchrysler Ag Oil mist centrifugal dis-entrainment unit, for an internal combustion engine crankcase breather, reduces load on main separator by use of a rotating vane inlet pre-separator
DE102005042725A1 (en) * 2004-09-23 2006-04-27 Mahle International Gmbh Axial cyclone used as oil mist separator in combustion engine of motor vehicle, has gyrator that rotates around axle inside tubular housing, in which tubular housing function as oil mist separator

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JPS57172107U (en) 1981-04-24 1982-10-29
US4651704A (en) 1985-01-30 1987-03-24 Honda Giken Kogyo Kabushiki Kaisha Breather arrangement for cam case of internal combustion engine
JP2504073B2 (en) 1987-10-07 1996-06-05 三菱自動車工業株式会社 Camshaft with oil separator mechanism
US5114446A (en) 1991-02-15 1992-05-19 United Technologies Corporation Deoiler for jet engine
JPH04127807U (en) 1991-05-10 1992-11-20 三菱自動車工業株式会社 cam cap
DE102005022254A1 (en) 2005-05-10 2006-11-30 Mahle International Gmbh Centrifugal oil mist separator device for hollow camshaft, has oil mist pre-separator pre-mounted as pre-separator that is connected with camshaft in mist feeding opening, and twist producer provided as final separator within axial cavity
US7219629B2 (en) 2005-07-11 2007-05-22 Kawasaki Jukogyo Kabushiki Kaisha Breathing system in combustion engine
EP1845238A2 (en) 2006-03-20 2007-10-17 Mahle International GmbH Cylinder head of combustion engine
CN101270683A (en) 2007-10-30 2008-09-24 重庆长安汽车股份有限公司 Gas oil separation structure of internal combustion engine crankcase ventilation system
FR2933626A1 (en) 2008-07-10 2010-01-15 Filtrauto Gas separating device for case of internal combustion engine of road vehicle e.g. car, has liquid e.g. oil, draining channel arranged at side of treated gas downstream zone for flow of liquid passed through medium
DE102009012402A1 (en) 2009-03-10 2010-09-23 Thyssenkrupp Presta Teccenter Ag Shaft body with integrated oil separator
US20120204723A1 (en) 2010-05-06 2012-08-16 Rolls-Royce Deutschland Ltd & Co Kg Centrifugal oil separator for an aircraft engine
DE102011000458A1 (en) 2011-02-02 2012-08-02 Thyssenkrupp Presta Teccenter Ag Shaft, in particular camshaft with a hollow shaft section

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EP3033499A1 (en) 2016-06-22
WO2015022050A1 (en) 2015-02-19
DE102013108770A1 (en) 2015-02-19

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