DE202004008785U1 - Free-jet centrifuges for cleaning the lubricating oil of an internal combustion engine - Google Patents

Abstract

A pulse centrifuge (1) has a housing (10) with a removable lid (14), a rotor (2) with a drive piece (3), and a contaminant trap piece (4). The drive piece runs upward into or through the contaminant trap piece, so that the drive piece comprises all the components for rounding of the rotor, and is itself securely mounted, so that it cannot be withdrawn axially with the lid open.

Description

The The present invention relates to free-jet centrifuges for cleaning of the lubricating oil an internal combustion engine, with a housing that comes with a removable Cover is closed, with a rotatably mounted in the housing rotor and with channels to the feeder the to be cleaned, pressurized lubricating oil and the removal the purified, non-pressurized lubricating oil, wherein the rotor in two parts accomplished is with on the one hand at least one recoil nozzle having drive part and on the other hand, a dirt collecting part having a dirt collecting area, wherein the dirt trap part for disposal or cleaning of the drive part can be separated, wherein the drive part of a first partial flow of lubricating oil and the dirt catching part of a second lubricating oil part stream flow through is, wherein the drive member against axial withdrawal with the lid open is stored secured and serving for the storage of the rotor Includes parts, wherein the drive part and the waste collecting part with a form-fitting with each other cooperating torque transmitting means accomplished are, wherein the torque transmitting means by axially plugging the dirt catching part on the drive part in engagement and by axial removal of the waste collecting part of Drive part except Are brought engageable, and wherein provided in the centrifuge means or attached to prevent the operation of the centrifuge or limitation of the axial mobility of the waste collecting part relative serve to the drive part and the ineffective or with the cover removed solvable are.

A Centrifuge of the type indicated above is in the older, not pre-published Utility Model Application No. 20 2004 004 215.0 of the applicant.

For the present Invention sets itself the task of free-jet centrifuge terms improve their properties, especially with the aim of a high efficiency, high operational reliability, a compact design, cost-effective production, easy installation in the manufacture and / or easy handling in the Maintenance.

A first solution The object is achieved according to the invention with a centrifuge the aforementioned type, which is characterized in that the centrifuge for the rotatable mounting of the rotor comprises a central axis, the at least about a part of their length is hollow and forms a portion of the Ölzuführkanals that in this Section one in the closing direction preloaded valve body a minimum pressure valve is disposed axially displaceable, that the valve body the axis protrudes and a sealing head of the valve body outside the axis lies and that one with the sealing head cooperating valve seat on a shaft supporting the axis Centrifuge housing part, through the oil supply channel runs, is trained.

Thereby, that the Sealing head of the minimum pressure valve is outside the axis, can an axle with a relatively small outside diameter can be used. This allows the use of a lower bearing of the centrifuge rotor with a correspondingly small diameter, which is beneficial low friction in this lower bearing and thus a high rotor speed ensures at a given drive power. At the same time, the minimum pressure valve is required no additional Space within the centrifuge, so that ensures a compact design remains.

A further embodiment of the above-explained centrifuge provides that the Valve body in several parts from interconnected individual parts, in particular the sealing head, a shank and a leading end piece, assembled is. For the Shank, which runs through the hollow part of the axis, satisfies a relatively small diameter. The sealing head, the for its function a larger diameter needed is outside the axis, so that thereby the measure of Axle diameter not affected becomes. Due to the multi-part of the valve body can for the individual parts respectively optimally suitable materials are used, whereby an optimized Function of the minimum pressure valve can be achieved in a simple way can.

alternative to do this, the valve body also in one piece be educated. By this embodiment, in particular a inexpensive Manufacturability of the valve body achieved.

A another solution The task is with a free-jet centrifuge of the beginning achieved type mentioned, which is characterized in that the drive part a central tubular body comprises to form a ring channel for the oil supply by far a central axis surrounds, on which the drive part is rotatably mounted, and that in one upper end portion of the annular channel between an upper bearing of the Drive part and an oil inlet of the waste collecting part a shielding ring is arranged, which is either radially inward to the Axis or radially outside to the tubular body is connected.

The shield ring protects the associated bearing against unfavorably high oil throughput, which can lead to bearing overheating. At the same time, however, adequate lubrication of the upper bearing is ensured since the shielding ring is either radially inward or radially outward is connected, so that at the opposite side still an oil passage for a sufficient amount to lubricate the bearing oil remains free. In the embodiment in which the shielding ring is connected radially on the outside of the tubular body, the advantage is additionally achieved that a radially outer dirt trap angle is formed, which keeps dirt particles from the bearing above the shielding ring.

A another solution The object is achieved according to the invention with a free-jet centrifuge of the type mentioned, which is characterized in that the centrifuge comprises a central hollow axis, the hollow interior in a first axial area a section of the oil supply channel and forms in a second axial region of a Ölablaßkanal that in the hollow Interior of the axle in a closing direction preloaded, with a valve seat limited axially displaceable is arranged, that formed in the valve body, an oil passage is and that with the oil passage in closing direction preloaded second valve body a pressure relief valve interacts.

In this version the free-jet centrifuge has a valve unit that in very compact design the functions of a minimum pressure valve and a Überdruckabsteuerventils united in itself. Advantageously, only two movable valve bodies are needed, which contributes to the compact design and easy assembly as well a reliable one Function results. The construction is advantageously so compact, that the entire valve assembly in the hollow interior of the axle for the rotor The centrifuge can be accommodated without the axle a particularly big one Have outer diameter got to. The Minimum pressure valve ensures that an oil flow through the centrifuge until then takes place when at the inlet of the Centrifuge a certain minimum oil pressure pending. Is the oil pressure below this minimum pressure, then the minimum pressure valve closed and there is no oil flow through the centrifuge takes place. The overpressure shutoff valve makes sure that at a too high pressure of the centrifuge incoming oil at least a partial flow of the oil on a short flow path through a discharge channel, on the drive part and on the waste collecting part the rotor passes, is derived, whereby a rapid pressure relief is achieved. As long as the pressure at which the Überdruckabsteuerventil opens, not is reached, the Überdruckabsteuerventil remains closed. The limited axially displaceable valve body of the Minimum pressure valve ensures in its open state that in this Condition at the same time the discharge channel is closed.

In further embodiment of this free-jet centrifuge is provided that the Preload of the first valve body and the second valve body in their closing direction is generated by a single spring. This design results in a particularly simple and space-saving design.

alternative can the preload of the first valve body and the second valve body in their closing direction be generated by a separate spring. In this version exists a greater variability in terms the forces, which should act as a preload on the two valve body.

According to one another solution The object initially stated is a free-jet centrifuge of the beginning mentioned type, which is characterized in that the centrifuge comprises a central hollow axis, the hollow interior in a first axial area a section of the oil supply channel for the Drive part and for the dirt trap part and in a second axial region a section of the oil supply channel only for the dirt trap part forms that in hollow interior of the axis a preloaded in the closing direction, with a valve seat cooperating valve body of a minimum pressure valve limited axially displaceable and that in the valve body an oil passage with defined Cross-section is formed, the sealing seat-side mouth radially Outside and downstream of a sealing contour cooperating with the sealing seat of the valve body lies.

In This free-jet centrifuge is advantageous as the valve body Means used to divide the centrifuge supplied oil flow into the two sub-streams, wherein the one partial flow to the drive part with the recoil nozzles and the other partial flow is supplied to the waste collecting part for cleaning. The oil passage through the valve body forms a defined cross section, which has a predefinable oil volume flow to the dirt trap part lei tet. When the valve body is in its closed position He locks both the partial oil flow to the drive part as well as the partial oil flow to the dirt trap part completely from. This prevents in the closed state of the minimum pressure valve an oil flow through the Dirt collecting part of the centrifuge flow and possibly there Mobilize dirt particles and discharge into the cleaned lubricating oil can.

An alternative to the above-described centrifuge solution of the problem proposes a centrifuge of the type mentioned, which is characterized in that the centrifuge comprises a central hollow axis, the hollow interior in a first axial region of a portion of the oil supply channel for the drive part and for the dirt trap part and in a second axial region forms a portion of the Ölzuführkanals only for the dirt trap part, that in the hollow interior of the axis a biased in the closing direction, with a Valve seat co-operating valve body of a minimum pressure valve limited axially slidably disposed and that between the outer circumference of the valve body and the inner circumference of the hollow axis an oil passage is formed with a defined cross-section, the sealing seat side opening is radially outward and downstream of a cooperating with the sealing seat sealing contour of the valve body.

With this alternative solution the same advantages are achieved as in the previously described Centrifuge, the difference being that now the partial oil flow, fed to the dirt trap part will, when open Minimum pressure valve through a defined annular gap between the outer periphery of the valve body and the inner periphery of the valve body leading hollow axis passed becomes. When the valve body is here in its closed position He locks it next to the partial oil flow to the drive part and the partial oil flow to the dirt trap part completely from.

A another solution The object is achieved according to the invention with a free-jet centrifuge of the type mentioned, which is characterized in that the soil the dirt trap part distributed in the radial and circumferential direction arranged perforations provided and under the openwork Floor at an axial distance from it and above the nozzles a closed shielding disk, which is part of the drive part, is arranged or that in the dirt trap part above its closed bottom an intermediate floor arranged is arranged with distributed in the radial and circumferential direction Openings is provided.

at This free-jet centrifuge is achieved that the rotor is radially from Outside viewed inward, it fills with oil only in its radially outer part, thereby including the mass of the rotor of the oil contained therein is lower than a full rotor, which is a higher speed at a given drive power results. This higher speed takes care of an accelerated separation of dirt particles from the lubricating oil by means of Centrifugal force. When the dirt particle cake, located in the radially outer area of the rotor interior settles, as far as has grown radially inward, that he a radially outermost Wreath of breakthroughs covered, steps the lubricating oil through the next ring of openings, which follows radially inwards from, which is then again achieved that only a limited amount of oil in the Rotor is included, although the advantage of increasing growing dirt cake is gradually smaller.

A Further development of the above-described free-jet centrifuge provides that the provided with the openings bottom or intermediate bottom as a perforated plate or screen plate is formed.

In addition, can on the floor or the intermediate floor one whose openings oil-permeable overlapping Material layer, preferably made of fleece or fabric, be launched. Although this material situation leaves oil through, but prevents passage of larger parts of the dirt particles or Sharing the dirt particle cake.

A another solution The object is with a free-jet centrifuge of the aforementioned Art achieved, which is characterized in that radially outward of a pure oil outlet of the waste collecting part at the top of a centrifugal housing part lying under the rotor one above the other two shielding discs are arranged, the coming of the pure oil outlet non-pressurized lubricating oil partial flow between the lower screen and the lower one Centrifuge housing part flows and wherein the from the recoil nozzles of the drive part exiting fast flowing lube partial flow through the space between the lower shielding disk and the upper shield is derived.

at This centrifuge are the emerging from the return nozzles oil partial flow and the oil part stream coming from the dirt trap part separated from each other held and it is at high speed from the nozzles exiting oil flow from outer periphery kept away from the rotating rotor, causing unwanted braking of the Rotor is avoided by the leaking lubricating oil.

A another solution the task is accomplished with a free-steel centrifuge of the type mentioned, which is characterized in that a central, rotatable Mounting the rotor serving axis integral with one under the rotor lying part of the centrifuge housing is executed.

at This centrifuge will do any assembly work for a connection of the axle avoided with a part of the centrifuge housing, resulting in more favorable Production costs for the centrifuge contributes. by virtue of the one-piece execution it can also not come to that the axis from which this supporting part of the centrifuge housing dissolves, such as This example, in a plug or screw under unfavorable Circumstances happen can.

Another solution to the problem is achieved with a free-jet centrifuge of the type mentioned, which is characterized in that on the outside of a central, serving for the rotatable mounting of the rotor axis at least one bearing sleeve is placed, which consists of a material which forms a favorable sliding pair with at least one bearing bush in the rotor.

at This centrifuge has the advantageous possibility of the material for the axis independent of the sliding properties with respect to the bearing bush in the rotor choose to be able to. This is for example the use of a light metal, such as aluminum or magnesium, as material for the axis possible, although light metal unfavorable Has properties with respect to a sliding bearing pairing. Only the mounted on the axle bearing sleeve must the Great Properties for have the sliding mating with the bearing bush of the rotor.

In order to the previously mentioned bearing sleeve after placing it on the axle an exactly round outer circumference has, in a further embodiment of this centrifuge is preferred provided that the bearing sleeve machined after grinding on the axis on its outer circumference by grinding is. By this subsequent Grinding is ensured that the bearing sleeve a exactly round outer circumference shape has, so that possible deviations of Axis itself of a perfectly round shape no adverse consequences for the outer periphery the bearing sleeve to have.

A another solution the task is carried out according to the invention with a free-jet centrifuge of the aforementioned type, which is characterized in that the drive part of the rotor is designed with a central tubular body through which to be cleaned oil the dirt trap part fed is that in an upper end portion of the tubular body at least one in the radial direction extending aperture as an oil inlet attached to the dirt trap part is that under Forming an annular gap space on the outer circumference of the upper end portion of the tubular body a sleeve-shaped, axially below and radially outside is closed and axially open at the top collar and that the oil inlet in the bottom part of the annular gap opens.

With the provided in this centrifuge collar is in the dirt trap part introduced oil partial flow over the Scope of the dirt trap part evenly distributed and in his Speed slows down. This is to ensure that a uniformly thicker in the circumferential direction Dirt cake cake forms and that a rinsing out of dirt particles a deposited in the interior of the dirt trap part dirt cake cake can not occur.

A another solution The task is carried out with a free-jet centrifuge of the beginning mentioned type, which is characterized in that the drive part the rotor is designed with a central tubular body having a shaft for the rotatable Storage of the rotor forms that the pipe body bottom and top of housing parts the centrifuge is stored as that lower bearing a sliding bearing is provided by a in the housing part located under the rotor used bearing bush and provided at the lower end of the tubular body, used in the bearing bush bearing part is formed, and that as the upper Bearings a rolling bearing is provided, that between the upper end of the tubular body and one over the housing part lying in the rotor, in particular Lid is arranged.

In this version The free-jet centrifuge there is no fixed axis on the the rotor rotates, but a rotor belonging to the shaft, which in housing parts of the centrifuge housing is stored. The bearing part inserted into the lower end of the tubular body and the bearing bushing inserted into the housing part located below the rotor consist of materials that form a favorable sliding pair. The pipe body in itself can thus be made of a different material, eg. B. light metal, be prepared to a drive part with the lowest possible weight to reach.

A Development of the centrifuge last described suggests that the the wave for stored the rotatable mounting of the rotor forming tubular body with axial play is and that the Size one lower face of the tubular body or the bearing part as specified of the pressure prevailing in the operation of the centrifuge oil pressure is such that one of the oil pressure caused, acting on the rotor axial force in the essentially the downwardly acting axial weight of the Rotor corresponds. With this embodiment of the centrifuge is achieved that in Operation, d. H. with rotating rotor, the weight of the rotor, which acts on the lower bearing, reduced or even canceled altogether becomes. As a result, also acting in the lower bearing accordingly axial forces reduced, which at a given drive power to a higher rotor speed and longer Warehouse life leads.

A to the previously described centrifuge alternative solution of Task is carried out with a free-jet centrifuge of the aforementioned Kind, which is characterized in that the driving part of the rotor with a central tubular body is executed, a wave for forms the rotatable mounting of the rotor, and that the tubular body only at the bottom of a lower housing part lying on the rotor the centrifuge by means of two axially spaced bearings is stored.

In this centrifuge, the bearing of the rotor takes place exclusively on the underside thereof, so that an upper housing part of the centrifuge, in particular dere whose lid, must not be used for the storage of the rotor. The necessary transverse stability of the bearing is ensured by the axial spacing of the two provided under the rotor bearing sufficiently.

In Further embodiment of the above-mentioned centrifuge is proposed that as lower bearing a sliding bearing is provided by a in the used under the rotor housing part Bearing bush and one provided at the lower end of the tubular body, in the Bearing inserted bearing part is formed, and that as the upper Bearings a rolling bearing is provided, viewed in the radial direction between the bearing part of the tubular body and the underlying housing part under the rotor is arranged.

With this embodiment of the storage can all during operation of the centrifuge occurring axial and radial forces reliably and at low friction and low wear. At the same time a very compact design is retained here.

A another solution the task is carried out according to the invention with a free-jet centrifuge of the type mentioned, which is characterized in that the centrifuge with a housing-fixed central axis and the driving part of the rotor with a central, the axis is carried out with surrounding surrounding tubular body, that by an annular channel between Axle and tubular body the lubricating oil to be cleaned the dirt trap part fed is and that on the inner circumference of the tubular body projecting radially inwards into the annular gap space, in the axial direction extending ribs are arranged.

at This centrifuge is advantageously achieved that the partial oil flow, the dirt trap part supplied to the rotor becomes effective already on its way through the ring channel in rotation is added, so that this partial oil flow at his crossing in the dirt trap part performs a rotation that coincides with the rotation of the Rotor coincides. In this way, a circumferentially uniform feed reaches the dirt catcher part of the rotor. Especially with a execution the dirt trap part with these dividing radial walls becomes so a uniform charge the different chambers of the dirt trap between the individual radial walls guaranteed.

A another solution The object is achieved according to the invention with a free-jet centrifuge of the type mentioned, which is characterized in that the centrifuge with a housing-fixed central axis and the driving part of the rotor with a central, The axis is carried out with a distance surrounding tubular body that through a hollow lower Section of the central axis, the lubricating oil of the centrifuge can be fed, that by a ring channel between the axis and the pipe body to be cleaned oil forming partial flow of the waste collecting part is fed, that at the bottom End of the tubular body a plain bearing bush is arranged on the hollow bottom Section of the central axis is stored and that after top facing end of the bearing bush as a valve seat for an axial displaceable in the tubular body guided in the closing direction preloaded valve body a minimum pressure valve is formed.

at This centrifuge is a particularly compact arrangement of the lower Plain bearing and minimum pressure valve achieved what contributes to a very compact design is. In the open Condition of the minimum pressure valve is the valve body of the Plain bearing sleeve lifted so that their rotation together with the rotor is not obstructed. When an associated internal combustion engine whose lubricating oil in the Free-jet centrifuge is cleaned, is turned off, the flow of oil ends by the centrifuge and the minimum pressure valve go into its closed position. there the valve body settles to the first still rotating plain bearing bush and has a braking effect on this. this leads to to an advantageously short run time of the centrifuge rotor, whereby associated with its rotation noise emissions after stopping the associated Internal combustion engine can be avoided.

A to the solution described above alternative solution The object is achieved according to the invention with a free-jet centrifuge of the type mentioned, which is characterized in that the centrifuge with a housing-fixed central axis and the driving part of the rotor with a central, the Axis with a distance surrounding tubular body is designed that through a hollow lower Section of the central axis, the lubricating oil of the centrifuge can be fed, that by a ring channel between the axis and the pipe body to be cleaned Lubricating oil Partial flow the dirt trap part is fed, that at the bottom End of the tubular body a plain bearing bush is arranged on the hollow bottom Section of the central axis is stored, that the axis in height of the upper End of the bearing bush has a radially outwardly projecting step and that the together facing up end faces of the bearing bush and the stage as a valve seat for an axially displaceable guided in the tubular body, in the closing direction preloaded valve body of a Minimum pressure valve are formed, wherein the valve body in its closed position a bearing gap between the axis and the bushing sealingly covered.

This centrifuge is the function and effect of the minimum pressure valve and its valve Body largely identical to the previously described embodiment. In addition, this alternative embodiment still has the advantage that in the closed state of the minimum pressure valve whose valve body in addition to the oil flow paths to the drive part and the dirt trap part and the bearing gap between the plain bearing bush and the se carrying part of the axis seals. This avoids that when the minimum pressure valve is closed, an oil flow flows through the bearing gap, if there is no need for lubrication.

A Development of the two previously described embodiments the free-jet centrifuge provides that the valve body hollow is and guided on the axis is that the Axle in her the valve body leading Area below a section of larger outside diameter and above has a portion of a smaller outer diameter and that the valve body has on its inner circumference a sealing contour or seal, the against the section of larger outside diameter seals and the distance to the smaller outer diameter radial distance Has. In this embodiment of the centrifuge, the valve body of the seals Minimum pressure valve in its closed position against both Bearing bush as well as against the axle. In its opening position gives the valve body then a big enough one Cross section for the passage of the oil through the minimum pressure valve, leaving the oil through a first flow path radially outside on the valve body over and over a second flow path radially inward through the valve body flow through it can.

According to one another solution The object is a free-jet centrifuge according to the preamble of the claim 1 proposed, which is characterized in that in the centrifuge provided or attached funds in operation the centrifuge for preventing or limiting the axial mobility the dirt trap part relative to the drive part and serve at detachable lid detachable are arranged through the dirt trap part or on the drive part Locking tongues are formed with locking lugs, with the driving part or cooperate with the dirt trap part provided recesses.

These Locking connection between the dirt trap part and drive part ensures in latched state for the desired secure fixing of the two parts against each other in the axial direction, can be but easy to solve if necessary, to separate the dirt trap part from the drive part.

A preferred development to this provides that the locking tongues above and radially inside as well as pointing downwards at the dirt catcher part and the recesses are provided above and radially inside the drive part. It can, for example Breakthroughs in the drive part as oil inlet into the dirt trap part anyway are provided, are used at the same time as latching recesses, which results in a beneficial dual function without additional components.

Around sure to rule out that yourself the latching connection described above unintentionally triggers automatically suggests a further embodiment that the Latching tongues are mounted pivotably about a pivot axis that the locking tongues with an upwardly pointing and protruding operating end are trained and that through Swiveling the operating end radially inwardly the respectively associated latching tongue with its latching nose radially outward swiveling and so except Engagement with its recess can be brought. A release of the Locking connection is here only by active actuation of the operating end the locking tongues possible, so here an intentional intervention of an operator required is. As long as the end of the operation the locking tongues are no powers to be trained out the connection between the dirt trap part and the drive part remains certainly received.

at all centrifuges described above is the dirt trap part of Drive part separable to the dirt catching part according to an intended Operating time together with a dirt particle cake deposited therein for themselves dispose. The dirt trap part is thus a disposable part, during the Drive part is a lifetime component of the centrifuge. To this To take into account the difference in the period of use is, according to a another solution the above task a free-jet centrifuge the beginning called type, in which the drive part of a metal, preferably made of light metal, such as aluminum or magnesium and wherein the dirt trap part of a plastic, preferably a thermoplastic such as polyamide or polyethylene exists.

For an effective Dirt separation from the lubricating oil, it is essential that the lubricating oil as possible far radially outside flows through the dirt trap part, because there the centrifugal forces are greatest. At the same time but must be guaranteed be that at increasingly radially from the outside inward growing dirt particle cake the inflow of the lubricating oil is not hindered by the dirt particle cake in the dirt catcher part. In view of this suggests another solution of Above asked task a free-jet centrifuge of the aforementioned Art ago, which is characterized in that in an upper region of the waste collecting part from its center during rotation of the rotor in the radial direction outward pointing flexible hose arms or articulated pipe arms provided as an oil inlet are.

In a fresh dirt catcher, in which there is no or only one thinner Has deposited dirt particles cake, take the hose or pipe arms upon rotation of the rotor due to the centrifugal force acting in the essential radial alignment. This flows through the hose or pipe arms introduced lubricating oil relatively far radially outward the hose or pipe arms in and out of the dirt trap part. With increasing radially inwardly growing dirt particle cake the outer ends the hose or pipe arms together with the inner surface of the dirt particle cake moved in the radial direction inwardly, whereby the inlet of the lubricating oil in the Inside of the dirt trap part according to with in the radial direction wanders inside. Thus, the introduction of the lubricating oil to be cleaned in the dirt trap part always in the most radially outward possible position.

A to the centrifuge alternative solution described above proposes a Free-jet centrifuge of the type mentioned above, which characterized is that in an upper portion of the waste collecting part from the center thereof in the radial direction to the outside pointing, rigid pipe arms with holes attached in their course provided as an oil inlet are.

at This centrifuge keeps the tube arms independent of rotation or standstill of the rotor and independent on the extent of deposited dirt particle cake their location and orientation. Due to the centrifugal forces but occurs the introduction the essential part of the lubricating oil to be cleaned is preferred through the still free radially outermost opening of the pipe arms, so that a similar The effect is achieved as in the centrifuge described above.

The The present invention further relates to a free-jet centrifuge for the Cleaning the lubricating oil an internal combustion engine, with a housing that comes with a removable Cover is closed, with a rotatably mounted in the housing rotor and with channels to the feeder the to be cleaned, pressurized lubricating oil and the removal the purified, non-pressurized lubricating oil, wherein the rotor made of plastic and is made in one piece or with fixed parts, wherein the rotor has at least one recoil nozzle and a dirt collection area and wherein the rotor for disposal with the lid open completely off the housing can be removed.

A free-jet centrifuge of the type described in the preceding paragraph is off EP 1 071 512 B1 known. The rotor is here completely designed as a disposable part, which is removed from the centrifuge during regular maintenance and replaced by a fresh rotor. So that the rotor can be easily disposed of, in particular thermally recycled, this consists entirely of a readily combustible plastic. During operation of this known free-jet centrifuge, the full flow of lubricating oil flowing through the centrifuge first flows through the dirt collecting area of the rotor and then through the recoil nozzles. It is disadvantageous that the interior of the rotor including its dirt collecting area is under the full lubricating oil pressure. This requires special reinforcement measures on the rotor in order to be able to withstand the high oil pressure without damage.

In In view of this prior art, therefore, the task arises to create a free-jet centrifuge in which a completely off Plastic existing rotor exposed to lower loads due to the lubricating oil pressure is.

The solution This object is achieved according to the invention with a free-jet centrifuge the type specified in the preamble of claim 32, characterized is characterized in that they Means for dividing the supplied Oil flow in a first and a second partial stream and that the rotor one comprising the recoil nozzle (s) Drive part, which is flowed through by the first partial flow of lubricating oil, and a dirt collecting part comprising the dirt collecting area, that of the second lubricating oil sub-stream flow through is, has.

With the division of the invention of the lubricating oil flow in the two partial streams specified above is the possibility created, the pressure level on the one hand in the drive part and on the other set separately in the dust catcher. Especially so there is the advantageous possibility to set a lower pressure of the lubricating oil in the dirt trap part, causing the with the lubricating oil pressure associated high forces, which act on the rotor from the inside, are significantly reduced can. It is now only the compared to the dirt trap part essential small executable Drive part under the full oil pressure, which constructively a represents significant simplification. At the same time it stays that way receive effective drive. Thus, the rotor can be lighter and with lower material costs are produced, resulting in cost savings in the production and higher Rotational speeds during operation of the rotor results.

In a further embodiment of the above-described free-jet centrifuge is proposed that the rotor has a one-piece upper part, an integral lower part and at least one intermediate wall arranged therebetween, which together are connected, preferably welded, and that the upper part and the intermediate wall include the dirt collecting area and the lower part and the intermediate wall form the drive part. Advantageously, only the intermediate wall is required for the oil-side distribution of the rotor in the dirt collecting part on the one hand and the drive part on the other hand, resulting in a simple production of the rotor. Ideally, a single welding area is sufficient for the connection of the upper part and the lower part and intermediate wall, which is a further contribution to a simple and thus cost-effective production of the rotor.

According to one Another embodiment is preferably provided that the upper part a radially inner and a radially outer annular wall and a top side Covering wall comprises, that the radially inner ring wall with its hollow interior a channel for the Dirt collecting part zuzuleitenden lubricating oil partial stream forms and that the radial inner wall in its upper area at least one crossing opening has the channel in the dirt collecting area. By use a radially inner and radially outer annular wall for the Shell gets this a high basic stability. At the same time, the hollow interior of the radially inner ring wall is called Channel for the feeder of the lubricating oil part stream to be cleaned used for the dirt trap part. Due to the location of the transfer opening in the upper area of the radially inner wall of the oil partial flow to be cleaned is possible Introduced high up in the dirt trap area and so lays a long Away through the dirt trapping area, what for the dirt particle elimination from the oil Cheap is.

In Another embodiment is again in the sense of a possible compact design, preferably provided that the lower part of a central Intake for the entire the centrifuge supplied lubricating oil flow that of the Inlet a first Opening with defined cross section through the partition leads into the canal and that of the inlet at least a second aperture of defined cross-section in at least a nozzle chamber formed between the intermediate wall and the lower part leads. In this design are all means for the distribution of the supplied lubricating oil flow in the dirt trap part on the one hand and the drive part on the other flowing partial flows within arranged of the rotor. Outside The rotor will not be another means of dividing the oil flow needed. By determining suitable cross sections of the two openings is a desired one quantitative breakdown of substreams for the Dirt catcher and for the drive part in a simple manner possible.

Around consuming to produce outer channels on the rotor To avoid is further preferably provided that the lower part on the upper side a low, congruent with the radially inner Ring wall of the upper part extending annular wall and that the second Through opening extends radially through the annular wall of the lower part. Of the for the Drive part certain oil partial flow so can from the central inlet on the shortest path through the second opening supplied to the drive part become. If necessary you can also several openings over be arranged distributed around the circumference of the low annular wall.

Around the purified lubricating oil as far as possible from the dirt trap section easy and with the lowest possible flow resistance remove it from the rotor to be able to is preferably provided that the intermediate wall one piece with at least one pipe socket-like oil outlet channel is executed, from a radially inner part of the dirt collecting area the / a nozzle chamber through to the bottom of the rotor and whose cross-section is larger as the cross section of the first opening and the crossing opening (s). By the one-piece execution the partition remains with the oil outlet The construction of the rotor is simple and it suffice in the best case, three items to form the complete rotor. By the relative to Cross-section of the first opening larger cross section of the oil outlet channel can build up no oil pressure in the dirt catcher part of the rotor, so that the desired low pressure is ensured in the dirt catcher part of the rotor. Only in the drive part, in proportion to the dirt trap part has a much smaller volume prevails the full lubricating oil pressure, but due to the small volume of the drive part easily from the parts of the rotor forming the driving part can be. In the drive part, the return nozzles form the area of the smallest Cross section in the flow path of the drive part flowing through the lubricating oil part stream, whereby a high drive power for the rotor ensured is.

in the Sense of a possible simple structure of the rotor is further preferred that the intermediate wall executed in one piece is and extends in a plane between the upper part and lower part. In order to comprises the rotor only three parts to be joined together, here Advantageously, connecting the parts together in a single can take place in the radial direction plane.

Alternatively, it is proposed that the intermediate wall is made in two parts and that extends a radially outer part of the intermediate wall in a first plane and a radially inner part of the intermediate wall in a second plane between the upper part and lower part. In this embodiment, although the rotor has an item more, but hereby greater freedom in terms of design insbesonde R reaches the drive part.

Around the rotor, in particular taking up most of the rotor Dust collecting part, with one possible manufacture low material thickness to be able to without causing the danger of damage, is preferably provided in a further embodiment that in the dirt trap part pointing in the radial direction, uniformly in the circumferential direction of the rotor spaced guide and partition walls are provided in one piece with the shell are. The guide and partition walls provide a stiffener the dirt trap part, in particular its radially outer peripheral wall, which acted upon rotation of the rotor by the resulting centrifugal forces becomes. By the one-piece design of Guiding and partition walls with the rest Rotor ensures easy manufacturability and there are none additional Assembly steps for the control and partition walls required. After all provide the leading and dividing walls for this, that when accelerating the rotor contained therein lubricating oil without slipping quickly is accelerated, so that the Centrifugal force used to remove dirt particles very quickly takes effect.

A further consequences with regard to a possible simple design of the rotor is that bottom and top of the rotor respectively a centric stub shaft for rotatably supporting the rotor attached or in one piece is formed. The stub shafts can be in an advantageous manner one piece be manufactured with the upper part or the lower part of the rotor, so that too therefor no special manufacturing and assembly steps are necessary.

A other design the centrifuge provides, instead of the stub shaft, that the rotor in its center an axially continuous, top and bottom or having only open-bottom cavity that through the cavity to the rotatable Storage of the rotor a housing fixed Axis runs and that between the axle and the rotor bearings are arranged when removing of the rotor from the housing remain on the axis. Also in this embodiment, the rotor remains in his Construction very simple and is therefore inexpensive to produce. Again, the rotor is completely disposable, with the bearings for storage of the rotor when replacing the rotor on the fixed in the housing of the rotor Centrifuge arranged axis remain and continue to be used for the new rotor become. So it's just here in the maintenance of the centrifuge only the rotor made of plastic together with the deposited therein Disposed dirt particle cake. The axis with the bearings remains as a lifetime component in the centrifuge.

For the before described embodiment the free-jet centrifuge is preferred in a further embodiment provided that by the housing-fixed axis an oil inlet forming one Section of an oil supply channel runs, that of through the oil inlet at least one provided in the axis first crossing opening with defined cross-section of the first partial lubrication oil flow can be guided into the dirt collecting area is and that of the oil intake by at least a provided in the axis second crossing opening with a defined cross-section the second partial lubrication oil flow can be guided in the drive part. In this embodiment, the means for dividing the centrifuge supplied Lubricating oil flow in the two partial streams for the Dirt collecting part and the drive part in the housing side provided axis integrated. The rotor must use it These agents do not have and can be correspondingly easier execution be.

Finally sees a development of the previously explained Centrifuge before that lower bearing of the rotor through a plain bearing with a on the Axis mounted bearing bush is formed, that downstream of the second crossing opening of the Axle in the bearing bush at least one leading into the drive part further Passage opening provided is and that the Rotor with a central lower, sleeve-like shaped area sealed in the sliding seat is placed on the bearing bush. Of the Flow path for the lubricating oil partial flow to the drive part runs here through the bearing bush and thus through the lower plain bearing of the Rotor through which ensures its effective lubrication reliable is. Furthermore, the rotor sits here by means of its lower, sleeve-like formed area tight and mechanically strong enough on the Bearing bush, so that a undesirable vertical movement of the rotor during operation of the centrifuge sufficient is prevented. During maintenance, the rotor can be manually or by means of an auxiliary tool are deducted from the bearing bush.

in the Following are embodiments of Invention explained. The figures of the drawing show:

1 a free-jet centrifuge with a minimum pressure valve, in longitudinal section,

2 a section of the centrifuge according to 1 with a modified minimum pressure valve, also in longitudinal section,

3 a combined minimum pressure relief valve and pressure relief valve as part of a centrifuge, in the closed state of both valves, in longitudinal section,

4 the minimum pressure valve and overpressure shutoff valve according to 3 , now in the open state of the minimum pressure valve, again in the longitudinal direction cut,

5 the minimum pressure and overpressure relief valve according to 3 and 4 , now in the open state of both valves, again in longitudinal section,

6 the minimum pressure valve and overpressure shutoff valve according to 3 in a modified embodiment, in longitudinal section,

7 a modified minimum pressure valve as part of the centrifuge, in longitudinal section,

8th a modification of the minimum pressure valve 7 also in longitudinal section,

9 the lower part of a rotor and a lower housing part of the centrifuge in a further embodiment, in longitudinal section,

10a a cross section along the line AA in the 9 .

10b a cross section along the line BB in the 9 .

11 the lower left area of another centrifuge, in longitudinal section,

12 a section of another centrifuge in the region of a lower plain bearing, in longitudinal section,

13 the central upper area of another centrifuge, in longitudinal section,

14 a complete centrifuge in a further embodiment, also in longitudinal section,

15 another complete centrifuge, also in longitudinal section,

16 another centrifuge in a cross-section through its central, central area,

17a a section from the central lower area of another centrifuge, with a lower bearing and a closed minimum pressure valve, in longitudinal section,

17b the centrifuge off 17a , now with open minimum pressure valve,

18 a modified embodiment of the centrifuge according to 17a and 17b also in longitudinal section,

19 another complete centrifuge, again in longitudinal section,

20 the central upper area of another centrifuge, in longitudinal section,

21 the complete rotor for a centrifuge, in a first embodiment, in longitudinal section,

22 off the rotor 21 in a modified version, again in longitudinal section,

23 off the rotor 22 in a cross section along the line CC in 22 and

24 another complete centrifuge, here again in longitudinal section.

1 shows a first centrifuge 1 in a longitudinal section, which serves to clean the lubricating oil of an internal combustion engine. The centrifuge 1 includes a housing 10 , the upper side with a screw cap 14 is closed. For this purpose has the housing 10 an internal thread 11 and the lid 14 an external thread 16 that are in screw engagement with each other.

In the lower part of the centrifuge 1 is in the case 10 a housing part 10 ' arranged here as an insert from above into the housing 10 is plugged in.

In the upper part of the centrifuge 1 there is a rotor 2 , on an axis 5 is rotatably mounted. The axis 5 is with its lower end in a centric axle 12 at the top of the housing part 10 ' used, for example screwed or pressed.

The rotor 2 the centrifuge 1 is formed in two parts and consists of a drive part 3 and a dirt trap part 4 ,

The drive part 3 of the rotor 2 comprises a central tubular body 30 and two arms outgoing from it, each through a branch channel 33 to a recoil nozzle 34 leads. The drive part 3 is by means of a lower plain bearing 51 and an upper rolling bearing 52 on the axis 5 stored.

The dirt trap part 4 consists of a peripheral wall 40 , an upper wall 41 and a floor 42 , wherein between the peripheral wall 40 and the floor 42 all around a weld 40 ' is attached to connect the parts together. When from the housing 10 removed cover 14 can the dirt trap part 4 by pulling up from the drive part 3 be separated and disposed of separately. A new dirt trap part 4 can then in the reverse direction from above on the drive part 3 be plugged to the centrifuge 1 to complete again.

The feeder of the centrifuge 1 To be cleaned lubricating oil from below through a central oil inlet 18 in the center of the housing part 10 ' is provided. From there, the flow path of the influent lubricating oil continues through a hollow section 53 the axis 5 and branches from there into two partial streams, namely a first partial flow through the branch channels 33 to the nozzles 34 and a second partial flow through a throttle point 37 in the plain bearing 51 through a ring channel 30 ' between the pipe body 30 and the axis 5 and through an inlet 44 in the upper part of the waste collecting part 4 , In the dirt trap part 4 the radially outer part of its interior forms a dirt collecting area 4 ' in which settle by centrifugal force deposited from the lubricating oil dirt particles as dirt particle cake.

In the area of the oil inlet 18 and in the hollow section 53 the axis 5 is a minimum pressure valve 7 arranged, which serves, an oil flow through the centrifuge 1 only to be allowed when at the oil inlet 18 a certain minimum oil pressure is present. The minimum pressure valve 7 here comprises a valve body 70 which is axially displaceable in the hollow section 53 the axis 5 is guided and by a coil spring 76 in the closing direction, ie in the direction of downward biased. The 1 shows the minimum pressure valve 7 in its closed position. When the oil pressure at the oil inlet increases 18 becomes the valve body 70 against the force of the spring 76 shifted upwards, whereby the lubricating oil through the oil inlet 18 in the hollow section 53 the axis 5 passes and from there, as described above, distributed to the two sub-streams.

The lower camp 51 of the rotor 2 Here is a plain bearing with a rotor 2 belonging bearing bush 21 on a correspondingly machined outer circumferential surface of the lower part of the axle 5 sitting.

The upper bearing 52 here is a rolling bearing, more precisely a deep groove ball bearing, which is between the upper end of the axle 5 and the upper end of the drive part 3 belonging tubular body 30 is arranged.

Below the upper bearing 52 there is a shielding ring 55 , this one in the left half of 1 in a first version and in the right half of 1 is shown in a second embodiment.

In the left half of 1 is the shielding ring 55 to the axis 5 tethered, preferably plugged in a sliding seat. Radially outward lies between the shielding ring 55 and the inner periphery of the upper end of the tubular body 30 a gap through which a small amount of oil can pass through the bearing 52 sufficient, but not too large, to supply with lubricating oil.

In the right half of 1 is the shielding ring 54 to the inner periphery of the upper end of the tubular body 30 tethered, for example, pressed here in the sliding seat. In this embodiment is radially inward between the shield 55 and the top of the axle 5 a gap kept free to allow the passage of a smaller amount of oil to lubricate the bearing 52 serves. In the corner area between the bottom of the shielding ring 55 and the inner circumference of the tubular body 30 Dirt particles, which are moved by the centrifugal force to the outside, settle, without there being a risk that the dirt particles harmful to the camp 52 can reach.

That through the inlet 44 in the upper area of the dirt trap section 4 reached lubricating oil flows through the interior of the waste collecting part 4 from top to bottom, being due to a rotation of the rotor 2 Dirt particles by centrifugal force radially outward in the interior of the dirt trap part 4 namely in its dirt collecting area 4 ' , drop. The cleaned lubricating oil leaves the dirt trap part 4 radially inward and downward through an oil outlet 47 , from where that lubricating oil in a non-pressurized area 13 inside the case 10 arrives. From there, the lubricating oil, for example, flow back into the oil pan of an associated internal combustion engine.

To the oil flow coming out of the oil outlet 47 exit, slow down and even out, are at the bottom of the drive unit 3 and at the top of the housing part 10 ' in the circumferential direction, interrupted Umlenkrippen 17 intended.

The one from the nozzles 34 escaping oil flow passes radially outward from the Umlenkrippen 17 also in the depressurised area 13 and from there back to the oil pan of the associated internal combustion engine.

2 shows a section of the centrifuge 1 according to the 1 with a modified minimum pressure valve 7 , In this embodiment, the hollow section 53 the axis 5 designed to be shorter in the axial direction and the valve body 70 in the closing direction biasing spring 76 is one in the hollow section 53 lying shaft 72 of the valve body 70 arranged around. As a result, an axially compact design is achieved.

The sealing head 71 of the valve body 70 is also here with the oil inlet 18 together in the under the rotor 2 lying housing part 10 ' , In the area of the oil inlet 18 is a valve seat 75 ausgebil det, to which the sealing head 71 is sealingly applied. From the sealing head 71 the shaft extends 72 of the valve body 70 up. To the shaft 72 around is the valve spring 76 arranged, whose upper end is attached to a step in the hollow section 53 the axis 5 supported and the lower end of the sealing head 71 supported.

At the height of the upper part of the shaft 72 is on the axis 5 the lower camp 51 with the bearing bush 21 arranged. Through the lower part of the axle 5 runs from its hollow section 53 starting a radial opening 54 outward. Another radial opening 54 " passes through the bearing bush 21 , This creates a flow path for the lubricating oil when the minimum pressure valve is open 7 from the oil inlet 18 through the hollow section 53 the axis 5 in the branch channels 33 to the nozzles 34 formed, over which the first lubricating oil partial flow for the drive part 3 to be led.

The second partial lubrication oil flow to the dirt trap part 4 flows here from the oil inlet 18 coming through the hollow section 53 the axis 5 and through a throttle point 37 in the ring channel 30 ' and through this up to the in 2 no longer visible inlet 44 the dirt trap part 4 ,

Regarding the further in 2 Visible items and reference numbers will refer to the description of 1 directed.

3 also shows in longitudinal section a further embodiment of the centrifuge, in which case it is essential that a combined minimum pressure valve 7 and overpressure shutoff valve 7 ' is installed.

Down in 3 is the central area of the housing part 10 ' recognizable, in the center of the oil inlet 18 lies. The oil inlet 18 here has the shape of an upwardly pointing nozzle, the top as a valve seat 75 is formed, with which the valve body 70 the minimum pressure valve 7 interacts.

The valve body 70 has an oil passage in its center 74 whose top as a second valve seat 75 ' is trained. With this second valve seat 75 ' acts a second valve body 70 ' as part of the overpressure shutoff valve 7 ' together. In 3 are both valves 7 and 7 ' closed The closed position of both valves 7 and 7 ' is by a common valve spring 76 causes, attached to the second valve body 70 ' and at a step in the hollow section 53 the axis 5 supported.

4 The drawing shows the combination of minimum pressure valve 7 and pressure relief valve Toff 3 in an opened state of the minimum pressure valve 7 and further closed state of the pressure relief valve 7 ' , The two valve bodies 70 and 70 ' are here by the increasing oil pressure at the oil inlet 18 together against the force of the spring 76 moved up until the valve 70 at a stop in the hollow section 53 the axis 5 comes to the plant, as in 4 recognizable. In this position, the lubricating oil from the oil inlet 18 on the valve body 70 passing radially outward through the radial channels 54 . 54 " partly in the branch channels 33 and on the other part in the ring channel 30 ' flow. A bearing gap between the bearing bush 21 and the axis 5 forms a throttle point 37 for the lubricating oil part stream, which is in the annular channel 30 ' and to the dirt trap part 4 flows.

In 5 is after a further pressure increase of the lubricating oil at the oil inlet 18 now also the overpressure shutoff valve 7 ' open. In this case, only the second valve body is due to the further rising oil pressure 70 ' against the force of the spring 76 pushed further upwards, creating the second valve body 70 ' from its associated valve seat 75 ' on the first valve body 70 is lifted off. As a result, a flow path through the oil passage 74 in one through the upper part of the axle 5 running discharge channel 13 ' released by the oil in a non-pressurized area of the centrifuge 1 is dissipated.

6 shows a modified version of the combination of minimum pressure valve 7 and overpressure shutoff valve 7 ' , The difference is that in the embodiment according to 6 two separate valve springs 76 and 76 ' are provided. The first valve spring 76 here only loads the first valve body 70 the minimum pressure valve 7 , The second valve spring 76 ' here only loads the second valve body 70 ' the pressure relief valve 7 ' , This allows the forces with which the two valve body 70 and 70 ' be preloaded in the closing direction, to be set individually. Otherwise, the execution corresponds to 6 the previously described embodiment according to the 3 to 5 ,

7 shows a longitudinal section of a section of a centrifuge with a modified minimum pressure valve 7 , Again, the minimum pressure valve 7 in the axis 5 accommodated. The axis 5 is at its lower end 50 formed with a thread in a corresponding threaded hole in the center of the housing part 10 ' is screwed. On the outer circumference of the axle 5 sits over its lower threaded end 50 a bearing bush 21 as part of a lower plain bearing 51 , Outside on the bearing bush 21 sits the lower end of the tubular body 30 of the drive part 3 ,

A lower hollow section 53.1 the axis 5 makes the oil intake 18 , From below is also in the section 53.1 a sleeve-shaped metal body is used, which has a valve seat 75 for a valve body by 70 the minimum pressure valve 7 forms.

The valve body 70 is above the valve seat 75 arranged and in the hollow section 53.1 the axis 5 guided axially displaceable. By means of the spring 76 is the valve body 70 preloaded in the closing direction.

In 7 is the minimum pressure valve 7 shown in its open position, in which the valve body 70 by the pressure of the oil inlet 18 pending lubricating oil against the force of the spring 76 moved upwards. In this position is the valve body 70 from his valve seat 75 lifted off and gives a radial channel 54 free, that from the hollow section 53.1 the axis 5 to the branch channels 33 for the recoil nozzles 34 leads. About this flow path, a first, larger lubricating oil partial flow flows to the drive part 3 , more precisely its recoil nozzles 34 , too.

A second portion of lubricating oil flows upwardly into a second hollow portion 53.2 in the axis 5 and via this flow path to the dirt trap part, not shown here 4 , A portion of this flow path leads through the valve body 70 for this purpose in its upper, predominant part of its axial length with a central oil passage 74 is provided in the form of a longitudinal bore. Near the lower end of the valve body 70 goes the central oil passage 74 in two radial holes over, on the outer circumference of the valve body 70 open out. Between the outer circumference of the valve body 70 and the inner circumference of the hollow portion 53.1 becomes a throttle point in this way 37 formed for a defined throughput of lubricating oil towards the upper hollow section 53.2 and to the dirt trap part 4 the centrifuge 1 provides.

In the absence of lubricating oil pressure at the inlet 18 pushes the spring 76 the valve body 70 in its closed position, in which he is at the valve seat 75 sealingly rests. In this position, both flow paths for the first partial flow of lubricating oil to the drive part 3 and for the second part of the lubricating oil to the dirt trap part 4 tightly closed.

8th shows a modification of the minimum pressure valve 7 out 7 the difference being that at the minimum pressure valve 7 to 8th its valve body 70 has no oil passage. Rather, it is provided here that between the outer circumference of the valve body 70 and the inner circumference of the hollow portion 53.1 a defined annular gap is present, which is a throttle point 37 for the dirt trap part 4 guided lubricating oil stream forms and for a defined oil flow and thus a desired distribution of the incoming lubricating oil in the two lubricating oil partial flows to the drive part 3 and to the dirt trap part, not shown here 4 provides. In its other details and functions, the execution corresponds to 8th according to the execution 7 ,

9 shows in longitudinal section the lower part of a centrifuge. At the bottom of 9 is the housing part 10 ' with its central axle 12 for the axis 5 recognizable with its lower threaded end 50 in the axle 12 is screwed. On the axis 5 is also the rotor again 2 by means of two bearings rotatably ge stores, in 9 only the lower bearing 51 , which is designed as a plain bearing, is visible.

Left and right in the upper part of the 9 is the lower part of the dirt trap part 4 of the rotor 2 recognizable. The peculiarity here is that the floor 42 the dirt trap part 4 with openings 42.2 is executed. The breakthroughs 42.2 are here performed in the form of holes, which are as wreaths on three different radii concentric to each other over the circumference of the soil 42 lie spread.

Below the ground 42 is located at an axial distance a shielding 32.1 that is part of the drive part 3 of the rotor 2 is. The space between the floor 42 and the disc 32.1 forms an oil outlet 47 for the purified oil.

Next comprises the drive part 3 the two branch channels 33 , each to a drive nozzle 34 for driving the rotor 2 to lead. From the shielding screen 32.1 extends centrally of the tubular body 30 of the drive part 3 up. Between the drive part 3 and the axis 5 is the plain bearing 51 arranged.

The lower end of the axle 5 makes the oil intake 18 , up to the hollow section 53 the axis 5 followed. In the amount of branch channels 33 connects the wall of the axle 5 penetrating radial channel 54 the oil inlet 18 with the branch channels 33 , The to the dirt trap part 4 flowing lubricating oil partial stream flows through the hollow section 53 the axis 5 continue up and get there in the dirt trap 4 ,

As long as in the dirt trap part 4 no or only a relatively small amount of dirt particles radially outward on the inner circumference of the peripheral wall 40 have settled, the purified lubricating oil flows from the interior of the waste collecting part 4 through the radially outermost ring of openings 42.2 down into the oil outlet 47 the dirt trap part 4 from. The radially inward of the outermost wreath of openings 42.2 lying part of the dirt trap part 4 Therefore, does not fill with oil, reducing the weight of the dirt trap part 4 including the oil contained therein is relatively small remains. This ensures a rapid acceleration of the rotor 2 at start-up and for a high speed at a given drive power.

If the on the inner circumference of the peripheral wall 40 depositing dirt particles cake is so thick that he expressed the wreath of openings 42.2 Covered, the purified lubricating oil flows through the next ring of openings radially inwardly 42.2 from. In this way, even in increasingly thicker dirt particle cake in the dirt trap part 4 limited amount of oil.

In the left half of 9 is inside the dirt trap part 4 another one of several control and partition walls 48 recognizable, each extending in the radial direction and on the one hand for entrainment of the lubricating oil during acceleration of the rotor 2 and to the other a stiffening of the dirt trap part 4 cause, so that it can also be made of plastic.

In the right half of 9 is on the top of the floor 42 in addition a material layer 42.3 arranged, which is oil permeable, but is largely impermeable to dirt particles. This location 42.3 consists for example of a fleece or a fabric.

Below the ground 42 lie in the radial direction, the ground 42 Bottom supporting ribs 32.4 , the part of the drive part 3 are.

10a shows a section through the centrifuge 9 according to the section line AA in 9 , Radially outermost lies the peripheral wall 40 the dirt trap part 4 , Radially in therefrom is the floor in top view 42 with its three wreaths of openings 42.2 recognizable. The control and partition walls 48 are in 10a not shown.

In the center of 10a is the axis 5 with the hollow interior 53 recognizable. Radially outside of it concentrically lies the tubular body 30 of the drive part 3 , The pipe body 30 closes with the axle 5 the ring channel 30 ' one.

10b shows the centrifuge 9 in a cross section along the line BB in 9 , Here is the view of the top of the shield 32.1 with the here four in the radial direction extending support ribs 32.4 , Below the shielding screen 32.1 lie hidden the branch channels 33 with its associated respective recoil nozzle 34 , In the center of 10b are the tube body 30 and the axis 5 cut. The area between the top of the shielding screen 32.1 and the support ribs 32.4 forms the outlet 47 for that out of the dirt trap part 4 exiting purified lubricating oil.

11 shows an embodiment of the centrifuge 1 which is characterized by having means by which the purified lubricating oil flow and that from the recoil nozzles 34 leaking lubricating oil flow separated from each other and from the outer circumference of the rotor 2 be kept away. These are on the top of the housing part 10 ' at an axial distance from this and from each other two shielding discs 17 ' and 17 " appropriate. A lower shielding disc 17 ' runs at a small axial distance from the top of the housing part 10 ' and radially inward to near the outlet 47 for the cleaned out of the dirt trap part 4 leaking lubricating oil. This through the outlet 47 escaping lubricating oil flows through the gap between the top of the housing part 10 ' and the underside of the lower shielding disk 17 ' in the non-pressurized centrifuge area 13 ,

The from the recoil nozzles 34 leaking lubricating oil flow enters a gap space between the top of the lower shielding 17 ' and the underside of an upper shielding screen 17 " and flows through this also in the depressurized area 13 , In this way it is achieved that the lubricating oil partial streams from the outlet 47 and the recoil nozzles 34 do not interfere with each other. In addition, it is ensured that no leaking lubricating oil to a significant extent on the outer circumference of the rotor 2 , more precisely, its dirt trap part 4 , which causes undesirable braking of the rotor 2 is avoided by reaching on the outside lubricating oil.

Right in 11 is still in the central area of the centrifuge 1 a minimum pressure valve 7 over the oil inlet 18 recognizable, the execution according to 8th equivalent.

12 shows a section of a centrifuge, in which it is characteristic that the axis 5 for the storage of the rotor 2 here in one piece with the housing part 10 ' is trained. The one-piece component from axle 5 and housing part 10 ' consists of weight reasons preferably made of a light metal. Since light metals, such as aluminum or magnesium, have unfavorable properties with respect to a sliding pair in a slide bearing is here according to 12 further provided that on the outer periphery of the lower part of the axle 5 a bearing sleeve 51 ' put on, preferably tightly pressed. Around an exactly round outer circumference of this bearing sleeve 51 ' to ensure that its outer circumference is expedient after pressing the bearing sleeve 51 ' on the axis 5 machined by grinding on an exactly cylindrical outer peripheral shape.

On the outer circumference of the bearing sleeve 51 ' sits the bearing bush 21 as part of the rotor 2 , here of its drive part 3 ,

One in a hollow section 53 the axis 5 arranged minimum pressure valve 7 corresponds to that already on the basis of 8th explained embodiment. With regard to the other parts and reference numbers in 12 Reference is made to the preceding figure descriptions.

13 shows in longitudinal section a section of the central upper region of a centrifuge. At the top of 13 is the central area of the lid 14 recognizable. Below is a part of the rotor 2 recognizable, here a central section of the upper wall 41 the dirt trap part 4 , In the center of 13 runs vertically the axis 5 with a hollow interior 53 is executed. The axis 5 is at a distance from the pipe body 30 surrounded, the part of not visible here drive part 3 of the rotor 2 is.

The dirt trap part 4 Partial flow of lubricating oil flows from below through the hollow interior 53 the axis 5 upwards and out of this by a radial bore above the rolling bearing 52 in the upper end region of the annular channel 30 ' above. From there lead two oil inlets 44 into the interior of the waste catcher 4 ,

Radially outside of the oil inlets 44 is on the upper end portion of the tubular body 30 a collar 39 attached, pressed here, the axially down and radially closed on the outside and axially open at the top. This collar 39 forms with the outer periphery of the upper end portion of the tubular body 30 an annular gap that ensures that through the inlets 44 flowing lubricating oil evenly in the circumferential direction of the waste collecting part 4 is distributed as far as possible immediately above the top wall 41 in the dirt trap part 4 entry.

Above the rotor 2 Here is an additional rolling bearing 15 ' provided, centered in the lid 14 is fixed. On the top of the upper wall 41 the dirt trap part 4 is an annular contact surface 45 formed, for example in the form of a glued ring. By means of this contact surface 45 can during rotation of the rotor 2 occurring in the operation of axial forces to the rolling bearing 15 ' are derived, whereby a low-friction operation is ensured even when axial resulting forces occur.

14 shows an embodiment of the centrifuge 1 , for which it is characteristic that here no housing-fixed axis for the storage of the rotor 2 is provided, but that the rotor 2 itself contains a shaft, by means of which it is in the housing 10 and on the lid 14 the centrifuge 1 is rotatably mounted.

The rotor 2 The centrifuge here again has a drive part 3 and a releasably connected, removable in the axial direction upwards dirt catching part 4 , The drive part 3 comprises a central tubular body 30 , from which at the bottom two arms, each with a branch channel 33 to each one associated recoil nozzle 34 out. Inside the tube body 30 is a channel 30 ' educated.

In the lower end of the pipe body 30 is a warehouse part 51.2 used, for example, pressed, which consists of a material, which together with a in the housing part 10 used bearing bush 51.1 offers a good mating. For example, the Lageteil consists 51.2 made of steel and the bearing bush 51.1 made of bronze. The rest of the drive part 3 is preferably made of a light metal, such as aluminum or magnesium.

At the upper end of the tubular body 30 is an insert inserted into this, preferably pressed, the one up over the rotor 2 protruding stub axle 5 ' forms. By means of an upper rolling bearing 52 is the rotor 2 centered above in the lid 14 with the help of the rolling bearing 52 stored.

In the channel 30 ' is in the lower area above the storage part 51.2 a minimum pressure valve 7 housed again in accordance with the execution 8th equivalent. If the minimum pressure valve 7 through one at the oil inlet 18 in the hollow storage part 51.2 is shifted upstream oil pressure, the incoming lubricating oil in the two partial streams on the one hand in the branch channels 33 to the nozzles 34 and on the other hand through the channel 30 ' over the inlet 44 in the dirt trap part 4 divided up.

That in the dirt trap part 4 cleaned lubricating oil leaves this through the radially inside and provided below the oil outlet 47 and gets along with the from the recoil nozzles 34 escaping oil flow in the pressure-free area 13 ,

In operation of the centrifuge 1 the upcoming lubricating oil pressure ensures that the rotor 2 in the axial direction is moved upward until a further axial displacement by abutment against the upper roller bearing 52 is no longer possible. In this position, as in 14 is present, there is in the bottom provided slide bearing 51 no axially adjacent surfaces, creating a smooth running of the plain bearing 51 is guaranteed.

15 shows again in longitudinal section a modification of the centrifuge 1 out 14 , unlike the 14 in the 15 the bearing of the rotor 2 by means of two bearings 51 and 52 done that both below the rotor 2 are arranged.

The rotor 2 again includes the drive part here 3 and the dirt trap part 4 , with the lid unscrewed 14 are separable from each other.

The drive part 3 here again includes a central tubular body 30 with a channel formed in its interior 30 ' as well as two laterally projecting arms, which are the two channels 33 to the recoil nozzles 34 contain.

In the lower end of the tubular body 30 is here again a camp part 51.2 used from below, for example, pressed. This bearing part 51.2 sits in a bushing 51.1 which, in turn, enter the central warehouse 12 in the housing part 10 ' is used.

With a small axial distance above this through the bearing bush 51.1 and the bearing part 51.2 formed slide bearing 51 is the second bearing the rolling bearing 52 arranged. This rolling bearing 52 also sits with its outer circumference in the central bearing receiver 12 in the housing part 10 ' and with its inner circumference on the outer circumference of the bearing part 51.2 , With this arrangement of the two bearings 51 and 52 below the rotor 2 this is rotatably mounted and secured sufficiently against tilting moments.

At the upper end of the rotor 2 is the tubular body 30 locked. Another storage is in the upper part of the rotor 2 Not.

One inside the tubular body 30 arranged minimum pressure valve 7 corresponds to the previously based on 8th described embodiment.

16 shows in cross section an embodiment of a centrifuge, in which for the storage of the rotor 2 again a central axis 5 is provided around which concentric the tubular body 30 of the drive part 3 runs. It lies in the 16 illustrated cross-section in an upper central region of the rotor 2 at the level of the inlets 44 for the lubricating oil in the interior of the waste collecting part 4 ,

In the center of 16 lies the central axis 5 that either with the housing part 10 ' connected or in one piece, as previously explained. Radially outward from the axle 5 lies the ring channel 30 ' which in turn is radially outward through the central tubular body 30 as part of the drive part 3 of the rotor 2 is limited.

Characteristic for the in 16 illustrated embodiment that of the inner circumference of the tubular body 30 parallel to each other and in the longitudinal direction of the tubular body 30 running, molded ribs 39 ' protrude. These ribs 39 ' make sure that when turning the rotor 2 and thus also during rotation of the tubular body 30 that through the ring channel 30 ' towards the inlets 44 flowing lubricating oil is effectively set in rotation, whereby the passage of the lubricating oil from the annular channel 30 ' in the inlets 44 is made easier and evened out.

Radially outside of the tubular body 30 are distributed in the circumferential direction arranged Leit- and partitions 48 recognizable, with its radially inner end at a distance from the tubular body 30 lie.

Finally, in 16 still two opposing torque transmitting means 6 recognizable, the transmission of torque from the drive part 3 on the dirt trap part 4 serve and which are designed such that the engagement of the torque transmitting means 6 by axial attachment of the dirt trap part 4 made on the drive part and by axially pulling the dirt trap part 4 from the drive part 3 can be solved. In the background the 16 is finally the bottom 42 the dirt trap part 4 recognizable.

17a shows in a longitudinal section a section of a centrifuge with a modified minimum pressure valve 7 , In its remaining parts, the centrifuge corresponds to 17a the basis of 9 explained embodiment.

The rotor 2 is here again by means of a plain bearing 51 in its lower part on a housing-fixed axis 5 stored. The axis 5 is here with her lower threaded end 50 in the central axle 12 in the housing part 10 ' under the rotor 2 screwed.

On the outer circumference of the lower part of the axle 5 above the threaded end 50 sits the bearing bush 21 from below into the central tubular body 30 of the drive part 3 is used. The top of the bearing bush 21 forms a valve seat 75 for a valve body 70 the minimum pressure valve 7 , The valve body 70 is hollow and on the axis 5 guided axially displaceable. By means of one above the valve body 70 arranged valve spring 76 is the valve body 70 preloaded in the closing direction.

As long as the central oil inlet 18 at the lower end of the axle 5 with the hollow section provided there 53 there is no sufficient oil pressure, takes the minimum pressure valve 7 his in 17a shown closed position. In this position, the valve body lies 70 sealing to the valve seat 75 at. At the same time now lies the valve body 70 radially inward on a section 5.1 the axis 5 with a larger outside diameter. In this position is the valve body 70 also on its inside catch by means of a sealing ring provided there 77 against the section 5.1 the axis 5 sealed. This is a flow of lubricating oil from the oil inlet 18 neither in the two channels 33 still in the ring channel 30 ' possible.

If the oil pressure at the oil inlet rises 18 above a minimum pressure, the oil pressure shifts the sealing body 70 against the force of the spring 76 in its open position, as in

17b is shown. The valve body 70 is now in the amount of a section 5.2 the axis 5 which has a smaller outer diameter, whereby an annular gap between the outer periphery of the section 5.2 the axis 5 and the inner circumference of the hollow valve body 70 is formed.

In accordance with 17b raised position of the valve body 70 can the lubricating oil from the inlet 18 coming through the hollow section 53 the axis 5 flow upwards and is then divided into two partial lubrication oil streams. The first partial flow of lubricating oil first flows radially outwards, then downwards and then again radially outward into the branch channels 33 , to the not visible here recoil nozzles 34 to lead. The second portion of lubricating oil flows axially upwardly through the hollow interior of the valve body 70 through into the annular channel 30 ' and from there into the dirt trap part 4 ,

18 shows a modification of the centrifuge 17a and 17b with a modified version of the minimum pressure valve 7 , Also in the execution according to 18 is the central axis 5 with its lower threaded end 50 in the axle 12 in the center of the housing part 10 ' screwed. On the lower part of the axle 5 above the threaded end 50 The bearing bush is also located here 21 for the rotatable mounting of the rotor 2 by means of the lower plain bearing 51 , Outside on the bearing bush 21 sits the lower end portion of the tubular body 30 of the drive part 3 , Between the outer circumference of the lower part of the axle 5 and the inner circumference of the bearing bush 21 is a storage gap 56 of the plain bearing 51 ,

In the in 18 illustrated embodiment, the upper end face of the bearing bush 21 and a radially inwardly adjoining, upwardly facing portion of a step 57 in the axis 5 together a valve seat 75 for the valve body 70 the minimum pressure valve 7 , For preloading in the closing direction is also the valve body 70 by an overlying valve spring 76 applied. The execution of the axis 5 with the lower section 5.1 larger outer diameter and the section thereafter 5.2 smaller outer diameter agrees with the design according to 17 match.

In the in 18 shown closed position of the minimum pressure valve 7 lies the valve body 70 sealing to the valve seat 75 at. As a result, a lubricating oil flow from the inlet 18 in the two channels 33 and in the ring channel 30 ' prevented. In contrast to the execution according to 17a and 17b ensures in the execution according to 18 the valve body 70 additionally for a closure of the storage gap 56 in the lower plain bearing 51 , This is also no leakage flow through the bearing gap 56 with closed minimum pressure valve 7 possible.

If by an increasing oil pressure at the inlet 18 and in the hollow section 53 the axis 5 the valve body 70 from his valve seat 75 against the force of the spring 76 is lifted, on the one hand, the flow paths in the two channels 33 and in the ring channel 30 ' released and on the other hand, the bearing gap 56 opened for oil entry. As a result, a sufficient lubrication of the sliding bearing 51 guaranteed with oil.

When the oil pressure drops, the valve spring pushes 76 the valve body 70 back in his in 18 visible closed position. The valve body ensures 70 at the same time for a deceleration of the rotor 2 what a uner wishes long after-running of the rotor 2 For example, when stopping the associated internal combustion engine prevented.

With regard to the other items and reference numbers in 18 Reference is made to the preceding figure descriptions.

The 19 shows an embodiment of the centrifuge 1 , which in most parts with the execution of the centrifuge according to the already explained 14 matches. The difference is with the centrifuge 1 according to 19 the design of the inlet 44 for the lubricating oil to be cleaned in the dirt trap part 4 , Here are instead of simple openings two or more flexible hose arms 44.1 as inlets 44 intended. Here are the hose arms 44.1 at its radially inner end at the upper end portion of the tubular body 30 attached and in fluid communication with the channel 30 ' inside the pipe body 30 through which the supply of the lubricating oil to be cleaned takes place.

In the left half of the 19 is the dirt trap part 4 of the rotor 2 shown in a state in which only a relatively small amount of dirt particles on the inner surface of the peripheral wall 40 has deposited. Here takes the hose arm 44.1 during rotation of the rotor 2 the top left in 19 shown, caused by centrifugal force a position at which the inlet 44 for the lubricating oil to be cleaned in the interior of the waste collecting part 4 relatively far radially outside and immediately in front of the inward-facing surface of the already settled dirt particle cake is located.

In the right half of the 19 is the rotor 2 shown in a state in which the dirt trap part 4 Be already a considerably thicker particle cake has settled, as this is just before the end of the use of the dirt trap part 4 occurs. By the radially growing from outside to inside dirt cake cake is the flexible hose arm 44.1 with its inlet 44 forming free end in the radial direction with inwardly moved, so that he finally in the right half of 19 visible position. With the flexible hose arms 44.1 is achieved that the inlet 44 for the lubricating oil to be cleaned in the dirt trap part 4 always so far radially outward, as the already deposited dirt particle cake still allowed.

Regarding the further in 19 Portions shown and reference numerals is made to the preceding figure descriptions.

20 shows a modification of the centrifuge, in which the dirt trap part 4 and the drive part 3 of the rotor 2 by means of adjustable locking tongues 8th are releasably connected to each other.

Top in 20 is the central area of the lid 14 recognizable. Underneath lies the upper wall 41 the dirt trap part 4 , In the lower part of the 20 is the bottom-up axis 5 for the rotatable mounting of the rotor 2 recognizable by the tubular body 30 of the drive part 3 of the rotor 2 is surrounded. Through the ring channel 30 ' between axis 5 and tubular body 30 The lubricating oil to be purified is supplied from bottom to top and passes through the inlets 44 in the dirt trap part 4 one.

With the central area of the upper wall 41 the dirt trap part 4 Here are several circumferentially distributed locking tongues arranged 8th connected or integrally leads out. These locking tongues 8th run in an approximately vertical direction parallel to the axis 5 and each have at its lower end an inwardly facing latch 80 , The upper end of the locking tongues 8th forms an operating end 82 , which can be actuated by applying a radially inwardly directed force by hand or with an auxiliary tool. This actuating force leads to a pivoting of the locking tongues 8th around its pivot axis 81 and thus to a pivoting of the locking lugs 80 in the radial direction to the outside. As a result, the locking lugs come 80 of recesses 83 passing through the top of the oil inlets 44 in the tube body 30 are formed, free. In this state of the locking tongues 8th can the dirt trap part 4 with the lid removed 14 in the axial direction of the drive part 3 subtracted from.

Between the upper end of the axle 5 and the upper end of the tubular body 30 is a rolling bearing as the upper bearing 52 for the rotatable mounting of the rotor 2 , Immediately below the camp 52 is the shielding ring 55 that already based on the drawing figure 1 was explained.

While the embodiments according to the previously explained 1 to 20 Each having a rotor with a drive part and a separable dirt trap part, are now in the 21 to 24 Embodiments explained that a mechanically one-piece rotor 2 but with the rotor 2 functionally each a drive part 3 and a dirt trap part 4 has, which are each traversed by its own partial flow of lubricating oil.

At the in 21 illustrated embodiment of the rotor 2 this one has a shell 22 and a lower part 23 and an intermediate wall arranged between them 24 , These three parts are welded together sealingly and so the one-piece rotor 2 form. The individual parts of the rotor 2 are preferably made of a thermoplastic material.

The top 22 of the rotor 2 has radially outside a peripheral wall 40 , radially inside an inner wall 43 and axially above a top wall 41 , which together form a one-piece injection-molded part. From the top of the upper wall 41 also protrudes in one piece with the upper part 22 trained stub shaft 5 ' before, for rotatably supporting the rotor 2 serves in the housing of the centrifuge, not shown here. Inside the dirt catcher 4 is a dirt collection area 4 ' formed, which serves to receive dirt particles from the centrifuged lubricating oil. The supply of lubricating oil in the dirt trap part 4 takes place through the channel 30 ' inside the radially inner wall 43 , which has several radial oil inlets 44 with the dirt collection area 4 ' connected is. In addition, inside the dirt trap part 4 extending in the radial direction and circumferentially spaced apart guide and partitions 48 arranged, which likewise with the upper part 22 are made in one piece.

In the lower part of the rotor 2 below the partition 24 is the driving part 3 educated. The drive part 3 consists of the lower part 23 and the partition 24 , In the space between the lower part 23 and the partition 24 are two nozzle chambers 34 ' formed, each with a recoil nozzle 34 for driving the rotor 2 are connected.

The supply of lubricating oil to the rotor 2 takes place centrally from below through the oil inlet 18 in the center of the sub-section 23 , This oil intake 18 is in the form of a pipe socket, which at the same time a downwardly projecting lower stub shaft 5 ' for the rotatable mounting of the rotor 2 forms.

In its upper part is the oil inlet 18 over a first, in the axial direction through the partition wall 24 running aperture 24.1 with the previously mentioned channel 30 ' for supplying the lubricating oil to be cleaned to the dirt collecting part 4 connected.

About a second opening extending in the radial direction 24.2 is the inlet 18 with the nozzle chambers 34 ' connected. The radial opening 24.2 runs through a low ring wall 30.1 , which are integral with the lower part 23 is formed and of this congruent with the inner wall 43 of the top 22 extends upwards. The lower end of the radially inner wall 43 of the top 22 and the axially upper end of the annular wall 30.1 of the lower part 23 each sealingly abut the top or bottom of the partition 24 at.

Next is the partition wall 24 nor with at least one integrally formed, through one of the nozzle chambers 34 ' running downwardly extending tubular member having an oil outlet 47 for the purified lubricating oil.

Like from the 21 Finally, it can be seen, the intermediate wall runs 24 here as a one-piece wall in a single radial plane through the lower part of the rotor 2 ,

22 shows a modified in this regard embodiment of the rotor 2 , in which now the intermediate wall of two partition parts 24 and 24 ' is formed. A radially outer intermediate wall part 24 lies in one of the location of the curtain wall 24 according to 21 corresponding position between the shell 22 and the lower part 23 of the rotor 2 , In contrast to the example according to 21 is in the example according to 22 the ring wall 30.1 formed higher on the top of the lower part. A central intermediate wall part 24.1 lies on top of this higher ring wall 30.1 on and has in its center the first opening 24.1 for the dirt trap part 4 flowing lubricating oil partial flow.

In its remaining parts corresponds to the rotor 2 according to 22 according to the execution 21 ,

23 shows the rotor 2 out 22 in a cross section along the line CC in 22 , Radial outside is in 23 the radially outer peripheral wall 40 the dirt trap part 4 of the rotor 2 recognizable. Radially inside is the inner wall 43 the dirt trap part 4 , Through the hollow interior of the inner wall 43 runs the channel 30 ' ,

From the peripheral wall 40 extend with this integrally formed guide and partitions 48 radially inward. In the left half of the 23 are these guide and partitions 48 both with the peripheral wall 40 as well as with the inner wall 43 made in one piece. In the right half of the 23 are the control and partition walls 48 only with the peripheral wall 40 in one piece, while being radially inward at the radial distance from the inner wall 43 end up.

24 finally shows a complete centrifuge 1 in longitudinal section, whereby here too the centrifuge 1 a one-piece rotor 2 having. The rotor 2 also has a drive part here 3 and a dirt trap part 4 but they are not separable here, but form a unity. The rotor 2 consists of a thermoplastic material and is made of a shell 22 and a lower part 23 along a circumferential weld 40 ' welded together. The radially outer region of the interior of the waste collecting part 4 here again forms the dirt collection area 4 ' , In the drive part 3 are two branch channels 33 formed, each to a recoil nozzle 34 for driving the rotor 2 to lead.

The housing 10 the centrifuge 1 here also includes one under the rotor 2 arranged housing part 10 ' with which a central axis 5 for the rotatable mounting of the rotor 2 is connected, here by means of a threaded end 50 the axis 5 is screwed. Furthermore, the axis 5 in a lower section 53 hollow, whereby a flow path for lubricating oil is formed.

It also lies in this hollow section 53 a minimum pressure valve 7 with a valve body 70 which, in the absence of lubricating oil pressure, the oil inlet 18 the centrifuge 1 closes.

By means of a lower sliding bearing 51 and an upper sliding bearing 52 is the rotor 2 on the housing-fixed axis 5 rotatably mounted.

With the minimum pressure valve open 7 flows to be cleaned lubricating oil through the inlet 18 in the axial direction upwards on the valve body 70 the minimum pressure valve 7 past. At the level of the lower plain bearing 51 carry radial channels 54 from the hollow interior 53 the axis 5 outward. In one on the lower part of the axle 5 seated bearing bush 21 of the plain bearing 51 are at the same height as the channels 54 further radial channels 54 " trained, the together form a radial flow path from the section 53 in the branch channels 33 to the recoil nozzles 34 form.

Near the top of the hollow section 53 the axis 5 introduces another radial channel 54 ' from the section 53 in a ring channel 30 ' which wall between a radially inner wall 43 the dirt trap part 4 and the outer circumference of the central axis 5 runs. Through this channel 30 ' and through this radially outwardly leading inlets 44 enters the lubricating oil to be cleaned in the dirt trap part 4 , The division of the incoming through the inlet lubricating oil flow in the two partial streams, on the one hand to the recoil nozzles 34 and on the other hand to the dirt trap part 4 Flow, made by the cross sections and the number of radial channels 54 . 54 ' and 54 " in a desired way.

During maintenance of the centrifuge 1 according to 24 can after unscrewing the lid 14 from the case 10 the rotor 2 completely pulled off in the axial direction upward after a fuse 38 from the top of the axle 5 was removed.

The rotor 2 sits in its assembled state by means of a lower section 30 " his pipe body 30 sealed and sufficiently tight on the bearing bush 21 of the lower plain bearing 51 and with an upper end portion of the tubular body 30 on the upper plain bearing 52 , The fit is at both camps 51 and 52 chosen so that the rotor 2 sufficiently tight in the mounted state, but with the cover removed 14 and remote backup 38 can still be easily pulled off manually upwards.

Regarding the further in 24 shown items and reference numerals is made to the preceding description of the figures.

Claims (44)

Free-jet centrifuge ( 1 ) for the cleaning of the lubricating oil of an internal combustion engine, with a housing ( 10 ) with a removable lid ( 14 ), with one in the housing ( 10 ) rotatably mounted rotor ( 2 ) and with channels ( 18 . 13 ) for supplying the to be cleaned, pressurized lubricating oil and for discharging the purified, non-pressurized lubricating oil, wherein the rotor ( 2 ) is designed in two parts with on the one hand at least one recoil nozzle ( 34 ) having drive part ( 3 ) and on the other hand a dirt collecting area ( 4 ' ) having dirt trap part ( 4 ), wherein the dirt trap part ( 4 ) for disposal or cleaning of the drive part ( 3 ) can be separated, wherein the drive part ( 3 ) of a first partial flow of lubricating oil and the waste collecting part ( 4 ) is flowed through by a second partial flow of lubricating oil, wherein the drive part ( 3 ) against axial withdrawal with the lid open ( 14 ) is secured and the storage of the rotor ( 2 ), wherein the drive part ( 3 ) and the dirt trap part ( 4 ) with positively cooperating torque transmission means ( 6 ) are carried out, wherein the torque transmission means ( 6 ) by axial attachment of the waste collecting part ( 4 ) on the drive part ( 3 ) and by axial removal of the waste collecting part ( 4 ) from the drive part ( 3 ) are disengageable, and wherein in the centrifuge ( 1 ) Means are provided or attached which, during operation of the centrifuge ( 1 ) for preventing or limiting the axial mobility of the waste collecting part ( 4 ) relative to the drive part ( 3 ) and with the cover removed ( 14 ) are ineffective or detachable, characterized in that the centrifuge ( 1 ) for the rotatable mounting of the rotor ( 2 ) a central axis ( 5 ) which is hollow over at least part of its length and has a section ( 53 ) of the oil supply channel ( 18 ), that in this section ( 53 ) in the closing direction preloaded valve body ( 70 ) of a minimum pressure valve ( 7 ) is arranged axially displaceable, that the valve body ( 70 ) off the axis ( 5 protrudes) and a sealing head ( 71 ) of the valve body ( 70 ) outside the axis ( 5 ) and that one with the sealing head ( 71 ) cooperating valve seat ( 75 ) on one axis ( 5 ) carrying centrifuge housing part ( 10 ' ) through which the oil feed channel ( 18 ), is formed. Free-jet centrifuge according to claim 1, characterized in that the valve body ( 70 ) in several parts of interconnected parts, in particular the sealing head ( 71 ), a shaft ( 72 ) and a leading end piece ( 73 ) is composed. Free-jet centrifuge according to claim 1, characterized in that the valve body ( 70 ) is integrally formed. Free-jet centrifuge according to the preamble of claim 1, characterized in that the drive part ( 3 ) a central tubular body ( 30 ) which forms to form an annular channel ( 30 ' ) for the oil supply by far a central axis ( 5 ), on which the drive part ( 3 ) is rotatably mounted, and in that in an upper end region of the annular channel ( 30 ' ) between an upper bearing ( 52 ) of the drive part ( 3 ) and an oil inlet ( 44 ) of the waste collecting part ( 4 ) a shielding ring ( 55 ) arranged either radially inward of the axis ( 5 ) or radially on the outside of the tubular body ( 30 ) is attached. Free-jet centrifuge according to the preamble of claim 1, characterized in that the centrifuge ( 1 ) a central hollow axis ( 5 ) whose hollow interior ( 53 ) in a first axial Be rich a section of the oil supply channel ( 18 ) and in a second axial region an oil drain channel ( 13 ' ) that in the hollow interior ( 53 ) of the axis ( 5 ) a preloaded in the closing direction, with a valve seat ( 75 ) cooperating first valve body ( 70 ) of a minimum pressure valve ( 7 ) is limited axially displaceable, that in the valve body ( 70 ) an oil passage ( 74 ) is formed and that with the oil passage ( 74 ) a preloaded in the closing direction of the second valve body ( 70 ' ) an overpressure shutoff valve ( 7 ' ) cooperates. Free-jet centrifuge according to claim 5, characterized in that the preloading of the first valve body ( 70 ) and the second valve body ( 70 ' ) in its closing direction by a single spring ( 76 ) is generated. Free-jet centrifuge according to claim 5, characterized in that the preloading of the first valve body ( 70 ) and the second valve body ( 70 ' ) in their closing direction by a separate spring ( 76 . 76 ' ) is generated. Free-jet centrifuge according to the preamble of claim 1, characterized in that the centrifuge ( 1 ) a central hollow axis ( 5 ) whose hollow interior ( 53 ) in a first axial region ( 53.1 ) a portion of the oil supply channel ( 18 ) for the drive part ( 3 ) and for the dirt trap part ( 4 ) and in a second axial region ( 53.2 ) a portion of the oil supply channel only for the dirt trap part ( 4 ) that in the hollow interior ( 53 ) of the axis ( 5 ) a preloaded in the closing direction, with a valve seat ( 75 ) cooperating valve body ( 70 ) of a minimum pressure valve ( 7 ) is arranged limited axially displaceable and that in the valve body ( 70 ) an oil passage ( 74 ) is formed with a defined cross-section, the sealing seat side opening radially outward and downstream of a with the sealing seat ( 75 ) cooperating sealing contour of the valve body ( 70 ) lies. Free-jet centrifuge according to the preamble of claim 1, characterized in that the centrifuge ( 1 ) a central hollow axis ( 5 ) whose hollow interior ( 53 ) in a first axial region ( 53.1 ) a portion of the oil supply channel ( 18 ) for the drive part ( 3 ) and for the dirt trap part ( 4 ) and in a second axial region ( 53.2 ) a portion of the oil supply channel only for the dirt trap part ( 4 ) that in the hollow interior ( 53 ) of the axis ( 5 ) a preloaded in the closing direction, with a valve seat ( 75 ) cooperating valve body ( 70 ) of a minimum pressure valve ( 7 ) is limited axially displaceable and that between the outer periphery of the valve body ( 70 ) and the inner circumference of the hollow axis ( 53 ) an oil passage having a defined cross-section is formed, the sealing seat-side opening radially outward and downstream of a with the sealing seat ( 75 ) cooperating sealing contour of the valve body ( 70 ) lies. Free-jet centrifuge according to the preamble of claim 1, characterized in that the bottom ( 42 ) of the waste collecting part ( 4 ) arranged in the radial and circumferential direction openings ( 42.2 ) and under the openwork floor ( 42 ) at an axial distance from this and above the nozzles ( 34 ) a closed shielding disc ( 32.1 ), the part of the drive part ( 3 ) is, is arranged or that in the waste collecting part ( 4 ) above its closed bottom ( 42 ) An intermediate bottom is arranged, which is provided with openings arranged distributed in the radial and circumferential direction. Free-jet centrifuge according to claim 10, characterized in that the one with the openings ( 42.2 ) provided ground ( 42 ) or intermediate bottom is designed as a perforated plate or mesh plate. Free-jet centrifuge according to claim 10 or 11, characterized in that on the ground ( 42 ) or the intermediate bottom one of its openings ( 42.2 ) oil-permeable overlapping material layer ( 42.3 ), preferably made of fleece or fabric, is laid up. Free-jet centrifuge according to the preamble of claim 1, characterized in that radially outward of a pure oil outlet ( 47 ) of the waste collecting part ( 4 ) at the top of one under the rotor ( 2 ) lying centrifuge housing part ( 10 ' ) one above the other two shielding discs ( 17 ' . 17 " ) are arranged, wherein the from the pure oil outlet ( 47 ) coming non-pressurized lubricating oil partial flow between the lower shielding ( 17 ' ) and the underlying centrifuge housing part ( 10 ' ) flows out and where the from the recoil nozzles ( 34 ) of the drive part ( 3 ) exiting fast flowing lubricating oil partial flow through the space between the lower shielding disc ( 17 ' ) and the upper shielding disc ( 17 " ) is derived. Free-jet centrifuge according to the preamble of claim 1, characterized in that a central, for the rotatable mounting of the rotor ( 2 ) axis ( 5 ) in one piece with one under the rotor ( 2 ) lying part of the centrifuge housing ( 10 ' ) is executed. Free-jet centrifuge according to the preamble of claim 1, characterized in that on the outside on a central, for rotatably supporting the rotor ( 2 ) axis ( 5 ) at least one bearing sleeve ( 51 ' ) is fitted, which consists of a material having a favorable sliding pair with at least one bearing bush ( 21 ) in the rotor ( 2 ). Free-jet centrifuge according to claim 15, characterized in that the bearing sleeve ( 51 ' ) after being put on the axle ( 5 ) is machined on its outer periphery by grinding. Free-jet centrifuge according to the preamble of claim 1, characterized in that the drive part ( 3 ) of the rotor ( 2 ) with a central tubular body ( 30 ) is executed, through which the lubricating oil to be cleaned the dirt catching part ( 4 ) can be supplied that in an upper end region of the tubular body ( 30 ) at least one radial opening in the radial direction as an oil inlet ( 44 ) to the dirt trap part ( 4 ) is mounted, that while forming an annular gap space on the outer periphery of the upper end portion of the tubular body ( 30 ) a sleeve-shaped, axially downwardly and radially externally closed and axially open top collar ( 39 ) and that the oil inlet ( 44 ) opens into the lower part of the annular gap space. Free-jet centrifuge according to the preamble of claim 1, characterized in that the drive part ( 3 ) of the rotor ( 2 ) with a central tubular body ( 30 ) is designed, which has a shaft for the rotatable mounting of the rotor ( 2 ) forms that the tubular body ( 30 ) at the bottom and top of housing parts ( 10 ' . 14 ) of the centrifuge ( 1 ) is stored as a lower bearing ( 51 ) a sliding bearing is provided, which by a in the under the rotor ( 2 ) housing part ( 10 ' ) used bearing bush ( 51.1 ) and one at the lower end of the tubular body ( 30 ) provided in the bearing bush ( 51.1 ) used bearing part ( 51.2 ) and that as an upper bearing ( 52 ) a rolling bearing is provided, which between the upper end of the tubular body ( 30 ) and one above the rotor ( 2 ) housing part, in particular cover ( 14 ) is arranged. Free-jet centrifuge according to claim 18, characterized in that the shaft for the rotatable mounting of the rotor ( 2 ) forming tubular body ( 30 ) is mounted with axial clearance and that the size of a lower end face of the tubular body ( 30 ) or the storage part ( 51.2 ) in accordance with the operation of the centrifuge ( 1 ) of the prevailing oil pressure is such that one of the oil pressure caused on the rotor ( 2 ) upward axial force substantially the downward axial weight of the rotor ( 2 ) corresponds. Free-jet centrifuge according to the preamble of claim 1, characterized in that the drive part ( 3 ) of the rotor ( 2 ) with a central tubular body ( 30 ) is designed, which has a shaft for the rotatable mounting of the rotor ( 2 ), and that the tubular body ( 30 ) only at the bottom of one under the rotor ( 2 ) housing part ( 10 ' ) of the centrifuge ( 1 ) by means of two axially spaced bearings ( 51 . 52 ) is stored. Free-jet centrifuge according to claim 20, characterized in that as a lower bearing ( 51 ) a sliding bearing is provided, which by a in the under the rotor ( 2 ) housing part ( 10 ' ) used bearing bush ( 51.1 ) and one at the lower end of the tubular body ( 30 ) provided in the bearing bush ( 51.1 ) used bearing part ( 51.2 ) and that as an upper bearing ( 52 ) a rolling bearing is provided, viewed in the radial direction between the bearing part ( 51.2 ) of the tubular body ( 30 ) and under the rotor ( 2 ) housing part ( 10 ' ) is arranged. Free-jet centrifuge according to the preamble of claim 1, characterized in that the centrifuge ( 1 ) with a housing-fixed central axis ( 5 ) and the drive part ( 3 ) of the rotor ( 2 ) with a central, the axis ( 5 ) by far surrounding tubular body ( 30 ) is carried out that by an annular channel ( 30 ' ) between axis ( 5 ) and tubular body ( 30 ) the lubricating oil to be cleaned the dirt trap part ( 4 ) can be fed and that on the inner circumference of the tubular body ( 30 ) radially inwardly into the annular gap space ( 30 ' ) extending in the axial direction ribs ( 39 ' ) are arranged. Free-jet centrifuge according to the preamble of claim 1, characterized in that the centrifuge ( 1 ) with a housing-fixed central axis ( 5 ) and the drive part ( 3 ) of the rotor ( 2 ) with a central, the axis ( 5 ) by far surrounding tubular body ( 30 ) is carried out that by a hollow lower portion ( 53 ) of the central axis ( 5 ) the lubricating oil of the centrifuge ( 1 ) can be supplied that through an annular channel ( 30 ' ) between axis ( 5 ) and tubular body ( 30 ) a part of the stream forming the lubricating oil to the dirt trap part ( 4 ) is fed, that at the lower end of the tubular body ( 30 ) a plain bearing bush ( 51 ' ) arranged on the hollow lower portion ( 53 ) of the central axis ( 5 ) is mounted and that the upwardly facing end face of the bearing bush ( 51 ' ) as a valve seat ( 75 ) for an axially displaceable in the tubular body ( 30 ) guided in the closing direction preloaded valve body ( 70 ) of a minimum pressure valve ( 7 ) is trained. Free-jet centrifuge according to the preamble of claim 1, characterized in that the centrifuge ( 1 ) with a housing-fixed central axis ( 5 ) and the drive part ( 3 ) of the rotor ( 2 ) with a central, the axis ( 5 ) by far surrounding tubular body ( 30 ) is carried out that by a hollow lower portion ( 53.1 ) of the central axis ( 5 ) the lubricating oil of the centrifuge ( 1 ) can be supplied that through an annular channel ( 30 ' ) between axis ( 5 ) and tubular body ( 30 ) a part of the stream forming the lubricating oil to the dirt trap part ( 4 ) is fed, that at the lower end of the tubular body ( 30 ) a plain bearing bush ( 51 ' is arranged on the hollow lower portion of the central Axis ( 5 ) is mounted, that the axis ( 5 ) at the level of the upper end of the bearing bush ( 51 ' ) a radially outwardly projecting step ( 57 ) and that the upwardly facing end faces of the bearing bush ( 51 ' ) and the level ( 57 ) together as a valve seat ( 75 ) for an axially displaceable in the tubular body ( 30 ) guided in the closing direction preloaded valve body ( 70 ) of a minimum pressure valve ( 7 ) are formed, wherein the valve body ( 70 ) in its closed position a bearing gap ( 56 ) between the axis ( 5 ) and the bearing bush ( 51 ' ) covered sealingly. Free-jet centrifuge according to claim 23 or 24, characterized in that the valve body ( 70 ) is hollow and on the axis ( 5 ), that the axis ( 5 ) in its the valve body ( 7 ) leading section below a section ( 5.1 ) larger outer diameter and above a section ( 5.2 ) has a smaller outer diameter and that the valve body ( 70 ) on its inner circumference a sealing contour or seal ( 77 ) which is in opposition to the section ( 5.1 ) larger outer diameter seals and the section ( 5.2 ) smaller outer diameter has radial distance. Free-jet centrifuge according to the preamble of claim 1, characterized in that in the centrifuge ( 1 intended or applied during operation of the centrifuge ( 1 ) for preventing or limiting the axial mobility of the waste collecting part ( 4 ) relative to the drive part ( 3 ) and with the cover removed ( 14 ) are detachable, by at the waste collecting part ( 4 ) or on the drive part ( 3 ) arranged locking tongues ( 8th ) with locking lugs ( 80 ) formed with on the drive part ( 3 ) or on the dirt catcher part ( 4 ) provided recesses ( 83 ) interact. Free-jet centrifuge according to claim 26, characterized in that the latching tongues ( 8th ) at the top and radially inwards and pointing downwards at the dirt collecting part ( 4 ) and the recesses ( 83 ) above and radially inside the drive part ( 3 ) are provided. Free-jet centrifuge according to claim 26 or 27, characterized in that the latching tongues ( 8th ) about a pivot axis ( 81 ) are pivotally mounted, that the locking tongues ( 8th ) with an upwardly pointing and protruding actuating end ( 82 ) are formed and that by pivoting the operating end ( 82 ) radially inwardly the respectively associated latching tongue ( 8th ) with its catch ( 80 ) can be pivoted radially outwards and thus out of engagement with its latching recess ( 83 ) can be brought. Free-jet centrifuge according to one of the preceding claims, characterized in that the drive part ( 3 ) consists of a metal, preferably light metal, such as aluminum or magnesium, and that the dirt trap part ( 4 ) consists of a plastic, preferably a thermoplastic such as polyamide or polyethylene. Free jet centrifuge according to the preamble of claim 1, characterized in that in an upper region of the waste collecting part ( 4 ) from its center during rotation of the rotor ( 2 ) in the radial direction outwardly facing, flexible hose arms ( 44.1 ) or articulated pipe arms as oil inlet ( 44 ) are provided. Free jet centrifuge according to the preamble of claim 1, characterized in that in an upper region of the waste collecting part ( 4 ) From the center of radially outwardly facing, rigid tube arms with holes attached in their course as an oil inlet ( 44 ) are provided. Free-jet centrifuge ( 1 ) for the cleaning of the lubricating oil of an internal combustion engine, with a housing ( 10 ) with a removable lid ( 14 ), with one in the housing ( 10 ) rotatably mounted rotor ( 2 ) and with channels ( 18 . 13 ) for supplying the to be cleaned, pressurized lubricating oil and for discharging the purified, non-pressurized lubricating oil, wherein the rotor ( 2 ) is made of plastic and one-piece or firmly interconnected parts, wherein the rotor ( 2 ) at least one recoil nozzle ( 34 ) and a dirt collecting area ( 4 ' ) and wherein the rotor ( 2 ) for disposal with the lid open ( 14 ) completely out of the case ( 10 ), characterized in that the centrifuge ( 1 ) Means for dividing the supplied lubricating oil flow in a first and a second partial flow and that the rotor ( 2 ) one the recoil nozzle (s) ( 34 ) comprehensive drive part ( 3 ), which can be flowed through by the first partial flow of lubricating oil, and a dirt collecting area (FIG. 4 ' ) comprehensive dirt collecting part ( 4 ), which can be flowed through by the second lubricating oil partial stream. Free-jet centrifuge according to claim 32, characterized in that the rotor ( 2 ) a one-piece top ( 22 ), a one-piece lower part ( 23 ) and at least one intermediate wall ( 24 . 24 ' ), which are interconnected, preferably welded, and that the upper part ( 22 ) and the intermediate wall ( 24 . 24 ' ) the dirt collecting area ( 4 ' ) and the lower part ( 23 ) and the intermediate wall ( 24 . 24 ' ) the drive part ( 3 ) form. Free-jet centrifuge according to claim 33, characterized in that the upper part ( 22 ) a radially inner and a radially outer annular wall ( 43 . 40 ) and a top-side cover wall ( 41 ), that the radially inner annular wall ( 43 ) with its hollow interior a channel ( 30 ' ) for the dirt trap part ( 4 ) too supplying lubricating oil partial stream forms and that the radially inner wall ( 43 ) in its upper region at least one transfer opening ( 44 ) from the canal ( 30 ' ) in the dirt collecting area ( 4 ' ) having. Free-jet centrifuge according to claim 33 or 34, characterized in that the lower part ( 23 ) a central inlet ( 18 ) for the whole of the centrifuge supplied lubricating oil flow, that from the inlet ( 18 ) a first opening ( 24.1 ) with a defined cross-section through the intermediate wall ( 24 . 24 ' ) into the channel ( 30 ' ) and that from the inlet ( 18 ) at least one second opening ( 24.2 ) of defined cross-section in at least one intermediate wall ( 24 . 24 ' ) and the lower part ( 23 ) formed nozzle chamber ( 34 ' ) leads. Free-jet centrifuge according to claim 35, characterized in that the lower part ( 23 ) on the upper side a low, congruent with the radially inner annular wall ( 43 ) of the upper part ( 22 ) extending annular wall ( 30.1 ) and that the second opening ( 24.2 ) radially through the annular wall ( 30.1 ) of the lower part ( 23 ) runs. Free-jet centrifuge according to claim 35 or 36, characterized in that the intermediate wall ( 24 . 24 ' ) in one piece with at least one pipe socket-like oil outlet channel ( 47 ) is executed, which from a radially inner part of the dirt collecting area ( 4 ' ) through the / a nozzle chamber ( 34 ' ) through to the bottom of the rotor ( 2 ) and whose cross section is larger than the cross section of the first opening ( 24.1 ) and the transfer opening (s) ( 44 ). Free-jet centrifuge according to one of claims 33 to 37, characterized in that the intermediate wall ( 24 ) is made in one piece and in a plane between upper part ( 22 ) and lower part ( 23 ). Free-jet centrifuge according to one of claims 33 to 37, characterized in that the intermediate wall ( 24 . 24 ' ) is made in two parts and that a radially outer part ( 24 ) of the partition ( 24 . 24 ' ) in a first plane and a radially inner part ( 24 ' ) of the partition ( 24 . 24 ' ) in a second level between upper part ( 22 ) and lower part ( 23 ). Free jet centrifuge according to one of claims 33 to 39, characterized in that in the waste collecting part ( 4 ) in the radial direction, in the circumferential direction of the rotor ( 2 ) evenly spaced guide and partition walls ( 48 ) are provided, which are integral with the upper part ( 22 ) are. Free-jet centrifuge according to one of claims 32 to 40, characterized in that at the bottom and at the top of the rotor ( 2 ) in each case a centric stub shaft ( 5 ' . 5 ' ) for rotatably supporting the rotor ( 2 ) is attached or integrally formed. Free-jet centrifuge according to one of claims 32 to 40, characterized in that the rotor ( 2 ) in its center an axially continuous, up and down or only downwardly open cavity ( 30 ' ), that through the cavity ( 30 ' ) for rotatably supporting the rotor ( 2 ) a housing-fixed axis ( 5 ) and that between the axis ( 5 ) and the rotor ( 2 ) Camp ( 51 . 52 ) are arranged in the removal of the rotor ( 2 ) out of the housing ( 10 ) on the axis ( 5 ) remain. Free-jet centrifuge according to claim 42, characterized in that by the housing-fixed axis ( 5 ) an oil inlet ( 18 ) forming portion of an oil supply passage that of the oil inlet ( 18 ) by at least one in the axis ( 5 ) provided first transfer opening ( 54 ' ) with a defined cross-section of the first partial flow of lubricating oil in the dirt collecting area ( 4 ' ) and that from the oil inlet ( 18 ) by at least one provided in the axis second crossing opening ( 54 ) with a defined cross-section of the second partial flow of lubricating oil in the drive part ( 3 ) is feasible. Free-jet centrifuge according to claim 43, characterized in that a lower bearing ( 51 ) of the rotor ( 2 ) by a plain bearing with a on the axis ( 5 ) mounted bearing bush ( 51 ' ) is formed, that downstream of the second transfer opening ( 54 ) of the axis ( 5 ) in the bearing bush ( 51 ' ) at least one in the drive part ( 3 ) leading further passage opening ( 54 " ) is provided and that the rotor ( 2 ) having a central lower, sleeve-like shaped area ( 30 " ) in the sliding seat sealed to the bearing bush ( 51 ' ) is attached.