HUE027187T2 - Cam shaft phase adjuster with multifunctional housing cover - Google Patents

Description

Cam Stefi Fîtes* With Muîi-Feadtoa&I Housing Cover

Tie ísyentkm relaies i& a hydraulic am shaft' phase setter fer a çombustkm eagme which preferably comprises a pressure storage fa order to ensure a setting pressure which is required for high Sfittmg speeds, in order to increase fee output and torque, bid also ίο reduce the fed consumption and exhaust emissions, of combustion engines for road vehicles, «a shat phase setters tor varying tire inlet aife also outlet control times tew become widespread m reoetu years. Due to tick high-degree of reliability, but also in view of a .favourable costfeenefit relationship, hydraulic phase setters which are operated by fee lubricating oil for fee combustion engine in accordance- wife fee principle of fee hydraulic pivoting motor have pro ven to he of value. Increased demands os feel consumption and. emissions require high setting speeds. In order to raise- the setting speed, in particular at a low lubricating oil. pressure and low oil temperature and a correspondingly high -viscosity, EP 1 $85 $ 13 A2 provides a. pressure storage in tue lubricating oil supply of the phase setter, wherein said pressure storage ensures a sufficiently high setting pressure for the -camshaft phase setter, even In operational situations of the combustion engine which arc problematic wife respect to the hydraulic supply. in accordance- with EP I 9i5 813 Ä2,. fee phase seder is mounted in m .attachment housing which can be assembled on fee cylinder bead housing. The attachment bousing forms a circumferential wail and a Iront wall of a pressure chamber -uf the pressure storage, A co ver seals (he pressure chamber on the opposite front side. Fluid channels which are required for operating fee phase setter and extend through the attaofeueni housing, for example a supply channel for fee: oil, are likewise sealed by covers or stoppers, EP 1 201 884 A2 relates to a combustion engine comprising a housing together with a covet which can he assembled on it. Conduits which are formed in the housing and feed to the outer side of fee engine housing which faces the cover are· sealed by a stopper which can for example be seresved. into a thread on the end of the conduit. US 5 718 196 and EP 0 ?Ö4 60S Λ2 relate to s com shaft phase adjuster. A magnetic Valve, .éö oil feed system and a cover are pre-assembled to form an assembly uni! and the« placed onto m opening in a cylinder head, where they are screwed down by means of bolts,: wherein before foe cover is screwed down, foe oil feed system is connected to a setting unit arranged in the opening, in order to be able to charge the setting unit with the oil from the magnetic val ve. U$ ? 189 999 A relates, to a cam shaft phase adjuster comprising a -cover In which numerous oil fosd conduits are integrated. Where the conduits feed to an outer edge of the cover, they are sealed.by conventional stoppers.

It is an object of the invention to provide a earn shaft phase setter which can be more simply produced and assembled and which exhibits a reduced likelihood of leakages occsrriag.

The subject of the -invention is a hydraulic cam. shaft phase setter winch comprises a setting device which can he charged with a hydraulic pressure fluid in order to adjust the phase position of a cam shaft of a combustion engine. The -setting device can in particular comprise a first rotor which is rotatkmally driven by a crankshaâ of foe combustion engine, and a second rotor which Is rotationally driven by the first rotor, wherein foe rotational angular position of the second rotor relative to foe first rotor can be adjusted by means of the pressure fluid The second rotor drives the cam shaft, wherein foe phase position of the cam shaft relative to the drive shaft can thus foe adjusted. The phase setter is preferably formed as a hydraulic pivoting motor. The setting device is charged with the pressure Held by means of a control valve, such that foe second rotor is adjusted relative to the first rotor - and the cam shaft to he controlled Is fous adjusted relative to the crankshaft -- into a rotational angular phase position which is favourable for the respective operational situation.

In a preferred embodiment, the phase setter includes a pressure storage comprising a variable-volume pressure chamber for foe pressure fluid. The volume of the pressure chamber is preferably elastically variable, such that a supply pressure fer foe setting device is set in foe pressure chamber in accordance with an elastic restoring force which acts towards a reduction in volume, The nressttre storage correspondingly comprises a pressure chamber and a wad structure which delineates foe pressure chamber and can he moved counter to a restoring elasticity force.

The movsfefo wall structure cm be 8¾ elastically flexible bk fhrid-proof wall staeture or preferably a piston which cas be moved, back and forth In the pressure chamber, fa the first &cmm% the wall structure can be fastened to the chamber wall, 1 can Itself form a spriag member which generates the restoring elasticity force, la such embodiments, the pressure storage would he a membrane storage comprising an elastic membrane or as applicable a flexible hut nors.~el.asde membrane which is terised fey an additional spring member, The pressure storage can also be Conned as an" elastic gaiter. Á piston pressure storage is particularly preferred, in. such embodiments, a piston is supported: ou a spring member, The spring member for foe piston or the merely flexible wall structure can. be formed by a gas pressure chamber, but is preferably a meehanicai spring, for example a spiral spring, which is tensed -- preferably, pressurised -- when foe pressure in fee chamber is increased.

The pressure storage can be -arranged in the supply cycle of foe phase setter such that foe pressure fluid can only flow to foe setting device through the pressure chamber. Alternatively, the supply cycle can be branched upstream of the pressure storage info a first flow path via which pressure fluid reaches the setting device by bypassing the pressure storage, and a second low path via which foe pressure fluid flows through foe pressure storage and reaches the setting device from the pressure storage, fn a modification of foe second alternative, the pressure storage is connected to the setting device via the branch, for which reference Is made to EF I 9È5- SO A2 as mentioned at foe beginning.

The phase setter also includes a cover which is fastened to foe: housmg. The housing sud foe cow can together form the pressure chamber of the pressure storage if, as is preferred, the phase setter comprises the pressure storage, in embodiments with a pressure storage, but in particular also in embodiments with no pressure storage, foe housing surd foe cover can together forte: art aceonnnodkmg: space for the setting device or the control valve. The word ’’or" is understood here, as elsewhere, by the invention In its usual logical sense of ''inclusive: or”, ie, it includes feofo the: meaning of "either ,., or" and the meaning of "and", unless only one of these two meamngs can exclusively follow from the respectively spéciik' context, in relation to the accommodating space for the setting device or the control valve, this means that the accommodating space formed jointly by foe housing and the cover accommodates only the settmg device and. not foe control valve in first embodiments, only foe control valve and not the setting device in second embodiments, and both the setting device and the control valve in third embodiments, ie. only one of these components- or both components is/are arranged in said accommodating space.

Lastly, at feast one fktid channel for tbe pressure fluid extends through the housing and feeds to a side of the housing, Le, ends in a port. The at least one fluid channel can extend upstream of the setting device or in particular upstream of the control valve, such that pressure fmid can be supplied to she setting devrce or the control valve via the fluid channel. Alternatively, the at least oo® fiaid charnel can however also be a drainage channel and/or relieving channel, which extends in fee bousing downstream of the control valve or hr particular the .setting device, mzk that the tinid can: flow off into a reservoir through such a fluid channel. The at least one .fluid channel can also be a fluid channel which connects the pressure storage, if one is provided, to the control valve or fee setting device.

In accordance with the invention, the cover is fastened to the housing such that it faces opposite the port, of the at least one fluid channel which extends through fee housing, and encapsulates covers, so to speak - the fluid channel. The fluid channel ends at or in fee cover or is. sealed by means of fee cover is at least one flow1 direction, preferably thai of flowing off. Thus, in accordance with the invention, the cover'Mills at least two, different functions.. In a Srst function, it forms - together wife housing - fee pressure chamber of the optional pressure storage or an accommodating space for fee setting device or the control valve, and in a second function, it covers and/or encapsulates the at least, one -fluid: channel of the housing which feeds opposite fee cover. Another cover or sealing stopper for fee fluid channel is not required. The cover comprises a joining surface which feces an opposite joining surface of fee bousing in so assembly direction of fee cover and is tensed in fee assembly direction towards fee opposite joining surface, directly or preferably via a gasket, preferably lay means of a screw connection. The joining surface- of fee cover which feces the housing, and the opposite joining surface of the housing, are sufficiently large or long in their extension around an assembly axis which is, parallel to the assembly direction such that fee cover can simultaneously fulfil fee at least two or preferably even more different functions of the cover. Instead of a single,, continuous joining surface and opposite joining surface, fee cover and the housing can also form mutually separate pairs of joining surfaces and opposite joining surfaces, in order to cover a plurality of fluid Channels -- tor example,: a· .supply channel. for foe pressure fluid, and a drainage channel - mû separate them írom each other usiug the same cover.

In preferred embodiments^ foe cover encapsulates- pot paly a .smile fluid channel bor also at least erne other fork! channel, in the same way as for foe at least one Surd channel The at least two fluid channels can in particular be a supply channel which extends upstream of foe control valve and a drainage channel which lies downstream of foe control valve, i£ as Is preferred, the phase setter comprises & pressure storage, then a connecting poriion which connects foe pressure storage to foe control valve and which Is a connecting portion of a supply channel leading on In the housing io foe control valve or tins setting device can he encapsulated by means of the cover,

The at least one fluid channel can be eaeapsnlafod such that foe cover simply seals the Smd channel, If a plurality of Stud channels are covered hy foe sane cover,: tins can be realised for each of the fluid channels. If as is preferred, foe pressure storage is provided, foe fluid channel or plurality of fluid channels: can feed into foe pressure chamber, enclosed by a common joking surface and opposite joining surface. In equally preferred enfoodiments, the cover comprises a fluid channel -which is connected to the at least one fluid channel of foe housing via foe interlace between foe cover and foe housing, surrounded in a seal by foe joining sur&ee and opposite joining snrfeee. A supply channel for foe pmssnm fluid can then extend -in »articulât through foe cover. In such embodiments;, a reflux valve can advantageously be fenned jointly by foe housing and foe cover, if the cover forms a valve seating and the housing forms a support tor a spring member which tenses foe valve bods into foe valve seating. The cover alone can also solely comprise- a corresponding reflux valve hi its supply channel: such a reflux valve is however mors preferably fenned jointly by foe housing and foe cover. When the cover is attached in. such embodiments, attaching foe cover sitmfoaneoualy presses the valve body into foe valve seating of foe covet, if the fluid channel which is encapsulated by foe cover is said drainage channel such a ilnld channel can m particular be sealed by the cover, for example in foe manner of a stopper or simply by a planar closure. If, as is preferred, the phase setter includes -a pressure storage, then the cover can to particular form. a cup-like part of foe pressure chamber, i.e, foe circomfereatiaf wall and a front wall of foe pressure chamber, in such embodiments, foe drainage channel can continue into: fhe çoypr &$ fät as a rear side of a pkim which k atrmgcâ in the pressure chamber,, m order ix> be able fe drab leakage fluid írom there. It can be draised for example els Ike cover. More preferably, however, the cover encapsulates the feaisage channel which is guided out of the housing at another peint In such embodiments, la & preferred embodiment, the posse setter la Integrated foto the lubricating oil supply of the combustion engine, euch tirai the lubricating oil simultaneously also forms tire pressme fiaid tor the phase seder,

The pressure storage is preferably a piston pressure storage. lu such embodiments, the pressure chamber is cylindrical and accommodates a pistou such that it can: be moved back and forth, The piston is elastically tensed k a direction in which it cm be moved mi m charged with the pressure fluid counter to this elastic restoring feres. When the fluid pressure is sufficiently high, the pressure chamber is filled counter to fee elastic restoring force. If the fluid pressure is reduced, the piston displaces the pressure fluid item fee pressure chamber towards the setting device of the phase setter in accordance with the elastic restoring force, such that it Is ensured feat the setting device Is supplied wife pressure fluid, A spring ~ expediently, a mechanical spring - acts on the piston in order to generate fee elastic restoring force. Is order to reduce leakage losses, it is advantageous If the piston Is sealed off from the liner of'the pressure chamber by means of a piston sealing ring. Such an additional seal between fee piston and the circumferential wall of fee pressure chamber is, however, omitted In simple preferred, embodhsents. The costs fur fee pressure storage cm thus be reduced, and fee breakaway force when a piston movement is »abated can likewise he reduced.

As already mentioned, fee setting device Is controlled by means of a condo! valve in order to set fee phase position of the cam shah advantageously for fee respective operational phase of the combustion engine, in preferred first embodiments, the control valve is arranged eo-aulally wife respect to fee rotational axis of the cam shaft ft can in particular be arranged such that it can be axially moved back and forth in a central hollow space of the cam shaft. If fee control valve is arranged in a hollow space of the cam simít, the earn shaft advantageously forms a valve cylinder comprising control openings to the pressnre chambers of fee setting device, hi sueh embodiments, the earn shaft forms fee val ve cylinder of fee control valve in one piece. 1» order to provide such & -eeniral arrangement, the cam shaft cm also be embodied as a composite earn, shaft, m the srnss that the valve cylinder is produced separately from: the cam. shaft and fixedly connected to the cam shaft at its axial end.

If the setting device is designed as a pivoting motor, It is favourable if its rotors are arranged concentrically with respect: to the control valve. The valve cylinder can. .also be formed by a rotor of the setting device which is connected, secured against rotating, to the cant shaft. tó egonlly preferred second enfeodiments, the control vâlve is not arranged eo-axislly with respect to the cam shaft hot rather alongside the rotational axis of the cam shaft, preferably at a amah distance alongside the setting device. An example of such an arrangement is disclosed1 is IF I 985 813 A2, to which reference Is also made in this respect.

The control valve can In particular he a proportional valve comprising a valve piston, an electromagnetic device for charging the piston with a setting three and a spring which counteracts the setting three. Other types of control valves can however also be used. The design of the. control valve can In particular he sees that the pressure field enters pressure chambers of the setting device through the valve piston or via fee circumference of the valve piston, m accordance with the axial position of fee valve piston, via control bores of the valve cylinder.

The boosing is preferably formed in one part, but cm in principle also fee assembled from separately formed housing pans, i.e. can already be a composite housing itself and. not only once the cover has been assembled. It is preferably an attachment housing which is attached or provided tor being attached to an engine housing of the combustion engine. In preferred ferst embodiments, the housing and the cover are assembled, as a unit, os the engine housing, In principle, however, the housing can also be attached, without the cover, fe a first step and the cover cm be assembled on the attached housing in a second step. In preferred second embodiments, a cylinder head housing of the engine housing or a valve bonnet fulfils the function of a housing for the phase setter. Such a housing part can in particular form -a front wall of the pressure chamber of fee pressure storage. A supply channel to the: pressure chamber or a supply channel leading on horn fee pressure chamber to fee control valve or fee setting device can extend in such a housing part. The cover can be assembled directly on the engine housing or a yatv© bontó m. order to «»capsulai« supply channel or the comkoatlve supply cfeasael The cover cm simultaneously also fhm the pressure chamber together with the engine housing or a valve bonnet in m expedient embodiment, a phase setter housing which is formed to include the engine housing, preferably a cylinder head bousing of the engine housing, or a -valve bonnet includes an additional housing part which is attached onto the engine housing and surrounds the setting device or the control valve and thus forms a covering for the setting device or the control valve and, in this sense, said accommodating space.

Advantageous features are described in the sub-claims and combinations- of them.

Example embodiments of the invention are described, below on the basis of figures. Features disclosed by the example embodiments, each individually and is any combination of features, advantageously develop the subject-matter of the claims and the embodiments described above. There is shown:

Figure 1 a phase setter comprising a housing and a housing cover, in a first example embodiment-;

Figure 2 a phase setter comprising a housing and a housing cover, in a second example embodiment;

Figure 3 the view A~A from Figure 2; F i gute 4 the view- B-B from Figure 2 ;

Figure .5: a phase setter comprising a housing and a housing cover, in a third -example embodiment;

Figure. 6 the view Á-A from Figure 5; mâ

Figure 7 the view B-B Írom Figure 5,

Figure ! shows a phase setter S w-hlcn is arranged m a cylinder head space of a combustion engine, The combustion engine comprises two adjacently arranged cam shafts, of which only a Erst cam shaft I can be seen in foe section shown. One of the cam shafts serves to control inlet valves of the combustion engine and the other serves to -control outlet valves of the combustion engine, "the cam: shafts can also respectively control one m more ialet valvets) and one or more outlet valvefs), i.e. for each combustion space, at least one inlet valve can he -adpcmfly arranged alongside .a» mtticf valve in îfee axial direction of the «am shaft. Is such embodiments is particular, a phase .setter fór only one of the cam shafts Is sufficient ..However, it is also possible :¾ such embodiments to respectively provide each of the cam shafts with a phase setter. The cam shafts are arranged m a cylinder head boosing 3, such that they can be rotated about their respective rotational axis;: the earn shaft I about its rotational axis R,·, The cam shafts are rotationaliy driven fey a crankshaft of the combustion engine. The phase setter S comprises a drive wheel 6 which is arranged eo~axially with respect to the cans shaft I ami driven by the crankshaft via a eireooiferential traction means, preferably a traction means which áríves in a positive St such as for example a chain or a toothed belt, Alternati ve drives for the cam shafts are disclosed in Eft Î 9b 5 813 Ä2, to which reicrenee is made in this respect 'in order to fee able to adjust the phase position of the cam shaft 1 relative to the crankshaft, the phase setter S includes » setting device ? which Is arranged in the torque chain, between the drive wheel 6 and the cam shaft 1, The setting device 7 includes: a. first rotor S which is connected, secured against rotating, to the drive wheel 6: and a second rotor 9 which is connected, secured against rotating, to the cam shaft 1. The rotor 9 can be roMionally moved relative to the rotor 8 within a predetermined rotational angular adjusting range. When the crankshaft is rotating, the irrst rotor § slaves the second rotor 9 in its own rotational movement, wherein the second rotor 9 can however be adjusted m its phase position relative to the first rotor $ within the rotational angular adjusting range.

The phase setter S can bo hydraulically adjusted. For the adjustment, it is .supplied.····· together with, the combustion engine - with a pressure oil which serves as a lubricating oil &r the combustion engine and as a pressure fluid for the phase setter S for adjusting the phase position of the second rotor 9 relative to the first rotor 8. The pressure fluid and/or lubricating, oil. respectively, is supplied to the setting device 7 via a control valve 10 which. Is arranged centrally on the rotational axis E, of the cam: shaft Î. The axial end of the cam shaft 1 at which the phase setter S is arranged comprises a central hollow space in which a valve piston 11 of the control valve 10 is accommodated such that it cun. he axially moved back and forth. The cam shaft .1 forms a valve cylinder lor the valve piston II, comprising control openings through which the pressure fluid enters pressure chambers: of the Seating device 7 - which are limited is the circumferential direction by the rotors 8 and 9 - in accordance with the axial position of.fee valve piston 11. It should also be added with respect to the rotor 9 that the latter is assembled 00 the cam shaft: l> scarred against rotating and concentrically with respect to the valve piston 11, namely in the axial region of Che valve cylinder formed by the can) shaft 1. It Is axially tensed against the cam shaft ! by means of a teasing means 2, for example a tensingnttt.

The control valve If) is a proportional 'valve. In addition to the valve piston 1.1. and the valve cylinder formed by the cam: shaft L it includes: an electromagnetic coil 12 comprising a central anchor which can he axially moved and charges the valve piston 11 with m electromotive setting force in an axial direction; and 0 mechanical spring 13, for example a helical pressure spring, which counteracts the setting fores. The coil 12 is controlled in accordance with the respective operational phase of the combustion engine, such that its anchor pushes the valve piston 1.1, counter to the restoring force of the spring 13, into an axial control position m winch the setting device 7 is charged with the pressure fluid In accordance "with said axial control position, Â housing part 4 which is fastened to the cylinder head housing 3 forms, together with the cylinder head housing 3, an accommodating space for the sotting device 7 and the control valve 10 by covering the latter components radially outwards and, by means of a coil housing of the coll 1.2 used, also ou the front side facing away from the cam shaft I.

The pressure fund ;s supplied to the setting device 7 via the cam shaft 1 which comprises a rotating pressure fluid supply 14 for this purpose. This rotary supply 14 is formed by an axial, bearing - m sngukr bearing of the cam shaft L Lubricating oil from the oil passage of the cylinder head housing 3 is supplied to the rotary supply 14 as the pressure fluid. Within the axial bearing, the cam shaft 1 is provided with a circumferential groove from which one or raore radial channels feed into the hollow space of the cath shaft 1, k order to direct the pressure Suit! through the valve piston Ü and the respective control bore of the valve cylinder formed by the cam: shaft 1.,. to the setting de vice 7,

In order to ensure a sufficient setting: speed of the phase setter 5,. even when there are pressure fluctuations in the pressure fluid supply system:, the phase setter S comprises a. pressure storage. The pressure storage is arranged upstream of the control valve 19 and also upstream of the rotating oil supply 14 in the pressure fluid, eye!«. The pressure storage is embodied as a piston: pressée storage.. A piste 22 is accommodated, such. that, it can he moved back a&d forth, in a press age chamber 21 of the f ressors storage.. The pis too 22 is charged w ith the press us? fund p& one side, in the other direction, the piston 22 is charged ~ counter to the pressure of the pressure fluid - with a spring: force of a mechanical spring 13, for example a Iwiicai pressure spring, The pressure storage Is connected to the lubricating oil passage of the cylinder head 3 via a. passage channel lé. The lubricating oil as the pressure &dd, enters the pressure chamber 21 through the passage channel, lé and a supply channel 1? which branches off &om it, A reflux valve .18 and a niter dement 1.9 are arranged in the supply channel Î?, The reflux valve IS seals the supply channel 17 when, the pressure of the pressure fluid in. the upstream channel 16 tails below the. pressure which prevails in the pressure chamber 21.

The cylinder head housing 3 only forms a. front wall 24 of the cylindrical pressure cham ber 21. A cup-shaped cover 20 forms a edeuoyidantla! wall 26 and, opposite foe dent wall 24, another iront wall of the pressure chamber 21. The cover 20 is connected, fluid-proof, to the Iront wall 24 by means of a gasket 23 which encircles the central longitudinal axi s of the pressure chamber 21. A spring 23 is supported m one side on the cover 20 and on the side axially opposite the cover 20 on the cup-shaped piston 22 and thus tenses foe latter axially towards the front wall 24, The cover 2Û is fastened to the cylinder head housing 3 on its front wall 24 in an assembly direction M, such foot a joining surface 2:0a of the cover 20 and an opposite joining surface 3a of the cylinder bead housing 3 face opposite each other via foe: gasket 25 in and counter to the assembly direction: M and are tensed against the gasket 25 and thus towards each other. The joining gap between foe joining surface 20s aud foe opposite joining surface 3a, which is sealed off by foe' gasket 25, surrounds foe pressure chamber 2,1 m a closed revolution about: the longitudinal axis of the pressure chamber 21 which is parallel to the assembly direction M and along which foe piston 22 is also guided, such font it can be moved bock and forth: by foe cover 20,

Th© cylinder head honsing 3 towns the hont wall 24 and tho supply channel 17, foe upstream passage channel 16 which loads to the supply channel 1?* and in particular also another supply channel If which connects foe pressure chamber 21 to the rotary supply 1.4 The supply channel IS is linear and connects foe pressure chamber 21 directly to the rotary supply 14. The pressure chtunber 2:1 is thus connected to the setting device 7 via a direct, advantageously short path,, to the example embodiment, foe supply channel 15 extends in foe assembly direction M orthogonally with respect ίο the rotational axis R:; of the cscb shaß L into the rotary supply 14. to modifications, it is possible to deviate from this aJjgameat, in order for example to arrange the pressure storage so an oblqoe alignment with, respect to the cans shaft L if for example the space available 1st the cylinder head space favours such an atfoagetaeat. In such modifications, the supply channel 15 would advantageously he maintained to an exclusively linear extension, hut one· which Is oblique with respect to the cam shaft.

The supply channel 15 sad the eontmnative supply channel 17 feed into the pressure chamber 21 at the same trónt wall 24> The channels 15 írni! 17 are parallel to each other. Due to ibis arrangement and alignment, the channels 15 and 17 can he cost-effectively termed to the cylinder head hoaxing 3, preferably by drilling In the same xnantihnng direction. The passage channel 16 is preferably likewise drilled into the material of the cylinder head housing 3, The pressure chamber 21 connects the channels 15 and 17, and the cover 20 encapsulates and/or covers the channels 15 and I ?. A drainage channel 38 is also fenned in the cover 20. wherein leakage fluid fern fee pressure chamber 21 can Sow off into fee cylinder head space from, the rear side of the piston 22 through said drainage channel 281 Â. short downstream channel portion 2:9 is fenned is the cylinder head housing 3, and fee dmmago channel 28 of the cover 20 feeds into said channel portion 2fe. The channel portion 29 is advantageously likewise parallel to the channels 15 arid 17, such that the channels 15, 17 and 29 can be cost-effectively produced by drilling in fee same machining direction.

In figure I, the channels 15, 16,. 17 and 29 are arranged in the same sectional plane. It will in general be advantageous not fo arrange all of feese channels in fee same sectional plane hut rather to provide an arrangement which is offset in the circumferential direcdoo about the longitudinal axis of the pressure chamber 21, while maintaining ihelr parallelism:.

In the example embodiment, fee cylinder head housing 3 and the attached bousing patt 4, Including the bousing of tie coil 12 nsed, form a housing for the setting device ? and the control valve 171 and, together with the cover 20, fee pressure chamber 21 for the purpose of the invention. In one modification, the fent wail 24 can be formed on fee housing part 4 in one piece with the lkáé .éternels I 5, I? and 29 or can be assembled oa she housing part 4 aad attached, as a uaft together with the housing part 4, to the correspondingly simplified cylinder head bousing. fe this modifieatioB, the cover 20 would be assembled: on the housing past 4 and would be part of an attachment housing which is attached, as it unit consisting of the housing part 4 and the cover 20.

In the example embodiment, the pressure chamber 21 is sealed by a cover 20 which is produced: as an: additional part. If, in another modification, the cam shaâs are covered by a valve bonnet, tor example a valve bonnet made of plastic, then the valve bonnet can form the cover 20, such that assembling such a valve bonnet on the cylinder head housing 3 simultaneously also closes the pressure chambersi and therefore also the channels 15,17 and 29.

Figure 2 shows a phase setter comprising an attachment housing consisting of a housing 5 and a. cover 30 which, is fastened, to the housing 5, The phase setter is completely fastened, as a phase setter atlachment module, to the cam. shaft and to an engine housing, by fastening the rotary supply 1.4 coaxially to the cam shaft which is to be adjusted: in its rotational angular position and fastening the housing 5 to the cylinder head: housing of the combustion engine, The pressure laid is supplied to a setting device 7, which cannot be seen in the section in Figure 2 and which can correspond to the setting device 7 of the first example embodiment, via the rotary supply 14. When, the module is .attadied,. the rotary simply 14 can correspondingly be rotated about the rotational axis R, of the earn shaft and connected, secured against rotating, to one of tire two rotors of the setting device ?·. The setting device ? and the rotary supply 1.4 are jointly aecotmwbdaled in an accommodating space of the housin g 5 .

Unlike the first example embodiment, the control valve 10 is not accommodated coaxially with respect to the setting device ? and the rotary supply 19 hut rather in its own accommodating space of tbc housing 5, alongside the setting device 7 and the rotary supply 14. The con trol valve 10 is inserted into this other accommodating space as a unit and, ones inserted, is embedded in the fluid system, of the attachment housing: 5 , 30, For further details of this separate arrangement of the setting device 7 and the control valve iff, reference is again made for example to EF 1 985 813 A2. The control valve 10 coinprlses a valve cylinder and: à valve piston 11 which can be moved back and forth in the valve cylinder, such that in accordance with the switched position of the valve piston 11, the setting device 7 is charged in one or other of the two rota&nai directions is which öné of the two rotes cost he adjusted relative to the other, as in the first example embodmieai la accordance with, the switched postdoc of the valve piston 11, the corresponding pressure eharuber(s) is/are charged either in one rotational direction via a first control channel Ils. or is the other rotational direction via another control channel lib. The control valve 10 is again actuated electromagnencally, such that the valve piston 11 assumes either the neutral position shown in Figure 2 or one of the two aforementioned switched positions lor a relati ve rotation to the left or right

The control valve ICI controls the pressure fluid, in a comparable way to the first example embodiment, via either the control channel 11a or the control channel 1 to or closes doth control channels ! la and lib, as in the neutral position shown, such that the setting device ? is hloefeed in the rotational angular position which is rotors currently assume. The pressure fluid is guided directly up to the control valve 10 via a supply channel 3? of the cover which extends through the cover 30 and a supply channel 35 of the housing which connects in a straight line to the supply channel 37 of the cover. A reflux valve comprising a valve body IS, a valve seating 37* and a spring member is arranged in the supply channel 37, 35 assembled hr this way, wherein the spring member presses the valve body IS Into the: valve seating 37', counter to the supply direction indicated by a directional arrow. The valve seating 37' is provided by the cover 30, wherein an insert element which directly forms the valve seating .17* is inserted into the supply channel 37 of the cover 30. The insert element simultaneonsiy servais to hold, a filter element 1:9 which is likewise arranged la the supply channel 37 of the cover. The spring member is however süppeded tm a support formed by the housing 5, The spring member can in particular be a helical pressure spring. The support is formed by a jump is diameter, namely a reduction in diameter, in the supply channel 35 of the housing. Since the pressure fluid supply which is composed: of the supply channels 35 and 37 exhibits a profile which is continuously linear in the attachment housing 5,30 up to the control valve 10, it is possible to reduce Its: flow resistance to a low level.

As in the first: example embodnneut, the cover 3(1 forms a cup-shaped part of a pressure chamber 31 which is arranged parallel to the supply channel 37 of the cover In the fluid sy stem, such that In the branch immediately downstream of the valve searing IT, the pressure fluid supply to the supply channel 35 of the housing, which is composed of the two supply channels 35 sod 37, branches into the pressure chamber 31 or the pressure storage vis a connecting portion 36 formed 1¾ the kïçskg S, The connecting portion 36 b formetI, m a poeker-hhe emdty which is open towards the cover 30, on the joining: aide of the: housing 5 facing the cover 30 and extends on the joining side of the boosing 5 on one side trans verse to the assembly direction M into a complete overlap with the supply channel 35 of the housing and on the other side into overlap with the pressure chamber 31. The supply channel .37 of the cover ami the pressure chamber 31 arc arranged immediately alongside each other mithin a minimum of space and both feed late the pocket-shaped connecting portion 36, which on the one hand leads: to a compact design, and on the other' hand to at least & low loss of .flow,· even between the pressure chamber 31 and the supply channel 35 of the housing.

As In the first example embodiment, the housing 5 forms a boat wall 34 of the pressure Chamber 31. The cover 3Ö again forms the opposi te front wall and the circumtbxcntísl wall of the pressure chamber 31. Opposite the front wail 34, the pressure chamber is limited by the piston 32 whieh can he moved bach, and forth and which is charged on its rear side with an elastic restoring force, cormier to the pressure of the press ure tinid situated in the pressure chamber 3 L by moans of the spring 33. As in the drat example eurbodlmeht, the spring 33 is accommodated m a spring space formed by the cover 50 on the rear side; o f the piston 3¾ the spring 33 Is again: for example a. helical pressure spring which is supported on the tout wall of fne cover 30 and acts on the piston 32 and towards the nont wall 34,

In the second example embodiment, leakage fluid is again drained from the rear side of the piston 32, via a drainage channel .38 which: extends through the cover 30 and commets to a connecting portion 38’ facing the joining side of the hoaxing 5, Into a drainage channel 39 of the housing 5 and from there into the reservoir. The cover 30 encapsulates: the drainage channel 39 of the housing, in that the drainage ehatmel 39 ends In. the cover 30, namely in the spring space, on the rear side of the piston 32:. The cover 30 also encapsulates the supply channel 35 of the housing, namely by means of the reflux valve whieh Is arranged In the transition region of the supply channels 35 and 37 and comprises the valve body 18. Where differences: have not been described or do not follow from the figures:,, reference is made to the first example embodiment.

Figure 3 shows the view A-Ä onto the joining surface 30a of the cover 30, Figure 4 shows the view B~B onto the opposite joining surface 5 a of the housing 5.. Figure 4 shows the attachment bossing 5,. 30 when It is. attached, wherein only the cam shaft 1 of foe combusiio» engine is· shown. When assembled, the joining surface 30a and the opposite joining surface 5a oppose each other iá the assembly direc tion M, wherein the pressure chamber 31, the supply composed of the channels 35 and 37 and the drainage composed of the channels 38, 3T sod 39 are scaled off from the Outside «mmmoentby the joining surface 30a and the opposite joining surface 5a by keafts of a gasket, for example a flat metal gasket, arranged between the surfaces 5a and 30a. They also seal off the pressure chamber 31 and the: supply '35,37 jointly from the drainage 31, 38’ and 39, The-coöbeÄg fokba 38', which Is formed in the joining surface 30& as a pocket-shaped cavity and extends tmmwerse to the assembly direction M and connects together the drainage channels 31 and 39 which are oftsei. with respect to each other, can also be seen in Figure 3, The cavity which Is open towards the cover 30 and formed in the opposite joining surface 5a in the manner of a pocket and forms the connecting portion. 36 can be seen in Figure 4, It should also he added with respect to the supply channel 35 of the housing and: the drainage channel 39 of the housing that these two channels extend in a very simple design in the assembly direction. M (Figure :2j, orthogonally with respect to the opposite joining surface Sa, and can in particular be worked kfo the opposite joining surface Sa as simple, linear bores. The comparatively flat pocket-shaped connecting portion 3d which is open on the opposite joining surface Sa: can also be formed very simply, preferably k an original moulding by casting or also by machine-cutting following original moulding. The pocket-shaped connecting portion 36 is advantageously wide and for example formed in the overlap with foe supply channel 35 to a width -which corresponds to the diameter of the supply charme! 35, such that it counteracts the pressure fluid between tits pressure chamber 31 and the supply channel 35 with as little flow resistance as possible; accordingly, a throttle effect is negligibly small. In the overlap with the pressure chamber 3 L the connecting portion 36 is widened up to the latter's diameter and formed in accordance with the cross-sectional shape of foe pressure chamber 31. Tins also helps to establish a- iow-resistauee transverse connection between the pressure chamber 31 and the supply channel 35.

Figure 5 shows a phase setter of a third example embodiment, The control valve 10, and the setting device ? together wtfo the rotary supply 14, are respectively arranged In their own accommodating space of a housing 50, as in the second example embodiment, and are coupled to each other via control channels lia and lib, as in foe second example embodiment. Differences: as compared to foe second example embodiment exist only in relation to foe divi sion of functions between the homrng 50 má&. sever 40. As is tfee other two example embodiments, the cover 40 Is fastened to a jomîag side of the housing SO is the assembly direction M. As m the second example. embofomesit, the 'housing 50 and the pre-assemfekd cover 40 together torts an abashment boosing for the phase scher which is tensed as an attachment module.

The cover 40 has been simplified as compared to the cover 30 of the. second example embodiment, is that the bousing 50 forms « cup-shaped space in which a piston 42 is arranged such that it can be axially owed Pack and forth in and counter to the assembly direction M, as in the other example embedments. The homing 50 correspondingly forms the circumferential wall and one of the two front walls of the pressure chamber 41 of the pressure storage formed together with the cover 40. The cover 40 only forms the iront wall which Is -wanting in order to encapsulate the pressing chamber 41 it also serves merely as a seal for the drainage channel 49 which extends in the homing 50 and via which leakage fluid is drained from the rear side of the piston 42, out of the space of the spring 43 which is arranged there, to the reservoir, wherein the drainage channel 49 drabs not only the leakage field of the pressure storage hot also the fiaid from the setting device 7 and any leakage fluid from the control valve 10, as in the second: example embodiment lu addition to the function of solely encapsulating, however, the cover 40 also fulfils die function of supplying the pressure fluid to the control valve 10. As in the· second example -embodiment, a supply channel 47 of foe cover which continues on foe side of the housing 50 into, a coatinuaiive supply ohaopel 45 of the housing extends through the cover 40, As in the second example embodiment, a reflux valve comprising a valve body IS and a spring member is formed in. the transition region between the cover 40 and the housing 50 and tenses the valve body 18 elastically against a valve seating 47' which forms the end-of the supply channel 47 of the cover which Sices the housing SO. The valve seating 47' is formed directly on the cover 40, i.e. with no insert clement In a modification, the valve seating 47" could however also fee formed with an insert element, as in foe second example embodiment A filter element can be arranged in foe supply channel 47. With regard to the pressure fiord supply to the control valve 10, which is composed of foe supply channels 47 and 45, that which has been said with respect to the second example embodiment applies; In particular, the supply 45, 47 extends from a connecting port formed by the covet 40 to the control valve W m a straight lose and via a short patin

Figure é shows the view A~A onto the joisksg sorfkce 40a of the cover 40. Figure 7 shows ike view B~B onto the opposite joining surface 50a of the housing 50:, The supply chasse! 45 .and the pressure chamber 41 extend in the bousing 50 from the opposite joining surface 50a of the housing 50, is the assembly direction M {Figure 5), orthogonally with respect to the joining surface 40a. On the side of the cover 40, the same applies to the supply channel 47 of the cover 40 in relation to the joining surface 40a. On the side of the housing 50. a connecting portion 46 which, is formed in the opposite joining, surface Sila is the shape of a pocket and is open to wards the cover 40 connects the supply channel 45 of the bousing to the pressure chamber 41 The supply channel 45 and the- pressure chamber 41 respectively feed into the pocket-shaped connecting porrion 46. counter to the assembly direction M (figure 5). in the view onto the opposite joining surface 50a, the connecting portion 46 also surrounds the port of the drainage channel 49 which likewise extends from the opposite joining surface 50a, orthogonally with respect to the opposite joining surface 50as as a bore which is linear in the assembly direction M. The port of the drainage channel 49 is surrounded over- its entire circumference by a sealing slay of the housing SO. This stay forms m opposite joining surface, which is encapsulated he. sealed tight - by the cover 40, around the port of the drainage channel 49 and Is correspondingly likewise referred to as 50a. The stay is raised as a profession, within the connecting portion 46. In order to seal if oil a gasket ···· expediently, a. fret metal gasket, a soft material gasket, so elastomeric profile gasket, a metal-elastomer gasket or the like -- is arranged between the joining surface 40a and the opposite joining surface 50a,. as can also be the case in the other example embodiments.

Aside from the features described, reference is mads to the statements made with respect to the second - example · embodiment:

EfeSSiilÄ 1 cam shaft 2 tensing means 3 cylinder head housing 3 a opposite j oining swiacs 4 imsmg part 5 atiaohroent housing .5a opposite joining surface 6 drive wheel ? setting device 8 first rotor 9 second rotor IÖ control valve 11 valve piston 11a control channel 1 lb control channel 12 coil !3 spring 14 rotary supply 15 supply channel 16 passage channel 17 supply channel 18 reflux valve, valve body 19 filter elenaeni 2Ö cover 20a joining surface 21 pressure chamber 22 piston 23 spring 24 front avail of the housing 25 gasket 26 clrcumietenfiai wall of the cover 27 front wall of the covet 28 drainage channel 2 9 drainage c hannel, chattel ; portion 30 cover 30 a jokung surface 31 pressure chamber 32 pístoa 33 spring: 34 test Wäll of the boding Μ supply channel 36 connecting portion 3? snpgly channel 37' vaive seating 38 drainage channel 3 3* drainage channel connecting poriion 39 dunnage channel 40 cover 40a joining surface 41 pressure charnber 42 piston 43 spring 44 fent wall of the housing 45 supply channel 46 connecting portion 47 supply channel 4?' valve seating 48 49 drainage channel 50 ahaeluneni housing 50a opposite joining surface M assembly direction R, rotational axis of the cam shaft S phase setter

Claims (6)

Claims; 1 «Crankshaft phase adjuster having a) housing (3, 4; 5; SO); the control valve (10) of the service vessel (d), optionally, a pressure reservoir with a compression chamber (.21; 31; 41} receiving the manikin), (e) the compression chambers (21; 31; 41) or the stator (21) together with the housing. ?) or a cover element (20; 30; 40) secured to the housing (3, 4; 5; 50) forming the receiving space for the control valve (10), and f) in the housing (. 3, 4; S; 50; ) is a mankind channel (15, 17, 29; 35, 39; 45, 49), which ends at one side of the house and ends in a cascade, said g) the cover element (20; 30; 40) towards the opening viewer is facing the house (3, 4; 5; 50) and h) the working fluid compartment rna (15, 17, 29; 35, 39; 45, 49) terminate on the cover element or in the cover element (20; 30; 40) or on the cover element (20; 30; 40) at least one flow direction closes the valve (15, 17, 29, 35, 39; 45, 49). Device according to Claim 2, 1, 1, characterized in that the manikin can be guided to the control valve (10) through the manhole channel (15; 35; 45) of the housing. Device according to the preceding claim, characterized in that the lid is a gate (30%, 40%) (37% 47% of the housing 05; 50) of the working stone channel (35; 45) sealing body (18). . Season frame according to any one of the preceding claims, characterized by. in your deck (30; 40}) the working stone is formed in the middle channel of the house (5; 50} (35, 45}) with a leading lid channel (37; 47}.) in which preference is given to the mankind filter filtering. 5- Άζ. a structure according to any one of the preceding claims, wherein the m-fluid medium channel (15, 17; 35? 45) enters into the pressure chamber of the optional pressure reservoir 21; 31; 41} or into the receiving space. A device according to any one of the preceding claims, characterized in that it is a pressure reservoir and a pressure channel (15? 35? 45) for supplying the control valve from the pressure chamber to the working fluid through the control valve (10) through the pressure reservoir (21? 31; 41). } is. A structure according to any one of the preceding claims, wherein the cover (25; 30? 40) is secured to the housing (3, 4? S; 50} so that the joint surface of the cover members is raised? 30a; 40 a} eqy mounting, direction (U} ') is applied to a counter surface of the housing (3a? Sa; 50a}, and the working fluid plug (15, 17; 35; 45) is at least substantially parallel to the mounting direction (H) up to the arrows) 8z The structure according to any one of the preceding claims, wherein the pressure barrier means 16 and (20), the interfacing surface (20a) and the opposing surface (3a) surround the pressure chamber (31) and the working fluid channel (15, 17}). and the working fluid channel (15, 17) runs into the pressure chamber (21}) A structure according to any one of the preceding claims, characterized in that the cover (30; 40) is secured to the housing (5; 50) so that a mounting surface of the cover element 30a; the front surface (5a? 50a) of the housing (5a? 50a) is adapted, and the channel section (36; 46} open to the lid valve) within the yoke of the housing (5; 30) or the channel section open towards the base within the interface of the cover element f is formed {10} The device according to any one of the preceding claims of the pressure chamber of the optional pressure reservoir (31? 41) or à ilit s and zex ke set tel (?) I. ; 49} downstream of the chief character (10} and the deck structure (7}), the latter (10, 7} being connected to a reservoir, the fact that the Tsunk is on the manhole medium channel (29; 39; 4 9); it lasts A device according to any one of the preceding claims, wherein the housing (3, 4; 5; 50} to the side to which the cover element (20; 30; 40} is attached) is pointing towards the cover element, an additional working fluid channel (29; 39; 49}) and through the cover (20; 30). ; 40} this additional work medium is also covered A device according to any one of the preceding claims, characterized in that it has a pressure reservoir formed in the pressure chamber (21; 31; 41} as a reciprocating piston (22; 32; 42}) and a working fluid channel of the housing (29). ; 39; 49} coupled to the rearward side of the pressure chamber (21; 31; 41} and the reservoir for storing the working medium) according to any one of the preceding claims, characterized in that it has a pressure vessel and a pressure chamber ( 21; 31} the circumferential wall (26) and one of its front walls (27) are covered by the cover element (20, 30}, and the opposite front wall (24} of the trowel chamber (21; 31)) (14, 4; 5) »14, a structure according to any one of the preceding claims, wherein said pressure is equal to 0 and vari, and the circumferential wall <41 # of the pressure chamber and one of the front faces of the housing (50}) and the other side of the housing (50). the cover element (4 0) is