EP1877193B1 - Centrifuge rotor - Google Patents

Abstract

A rotor for a centrifuge (1), wherein the rotor is rotatably driven about a rotation axis and includes two parts, i.e., a central bearing part and a waste collecting part which is provided with a waste collecting area. The waste collecting part is separable from the bearing part for waste disposal or cleaning. The bearing part and waste collecting part are provided with torque transmitting surfaces which interact with each other in a form-fitting and/or adherence manner and are connectable by axially positioning the waste collecting part on the bearing part and disconnectable by axially removing the waste collecting part from the bearing part. The rotor is formed such that the circumferences of the bearing part and the waste collecting part are connectable in a form-fitting manner and arranged in such a way that the waste collecting part circumference is placed or rests on the corresponding circumference of the bearing part already at the initial state of the waste collecting part or as result of the radial expansion thereof produced by a centrifugal force and/or by heating.

Description

The present invention relates to a rotor for a centrifuge, wherein the rotor is rotatably driven about an axis of rotation, wherein the rotor is designed in two parts with a central bearing part and on the one hand a dirt collecting portion having dirt collecting part, wherein the waste collecting part for disposal or cleaning of the bearing part is separable and wherein the bearing part and the dust collecting part are designed with positively and / or non-positively cooperating torque transmission means, which are engageable by axially plugging the dirt catching part on the bearing part in engagement and by axial removal of the waste collecting part from the bearing part.

Centrifuges have been used for various uses for decades and are therefore known in many different designs. In the known centrifuges, an inner diameter of the rotor generally centered on an outer diameter of the axis or on an outer diameter of a component located between axis and rotor, such as rotor bearing or drive part. In order to assemble and disassemble a two-part, consisting of bearing part and dirt catching rotor, a mounting clearance between the parts of the rotor is usually required; a maximum of slight compression is permissible so that the rotor can still be mounted and dismantled. In order to save weight and production costs, the aim is increasingly to build the rotor as easily as possible, for example by using plastic instead of metal.

The document DE 10 2004 005 920 A1 shows a free-jet centrifuge with a rotor in which a dirt trap part as a disposable part made of plastic and a bearing part as a recoil turbine are plugged together and pulled apart. In all embodiments shown and described in the document, a ring area engages the dirt-trapping part is positively connected radially on the outside over an oppositely shaped annular region of the bearing part, whereby a slip-free torque transmission from the drive part to the dirt trapping part is achieved. For mechanical stabilization of the plastic dust collecting part may have this on its outer circumference extending in the longitudinal or circumferential direction reinforcing ribs.

The document US Pat. No. 6,296,765 B1 shows a centrifuge with a mounted in the centrifuge housing drive member which carries a blade ring on which a housing-side nozzle sprays a drive fluid. A dirt trap part can be plugged together with the drive part and can be removed from it. In all embodiments described and illustrated in this document, a polygonal body is provided on the drive part, which in the assembled state of the drive part and the dirt trapping part is radially outwardly enclosed by a suitably shaped annular region of the dirt trapping part and transmits the drive torque.

The document DE 197 15 661 A1 shows a centrifuge with a two-piece rotor. The rotor upper part with a dirt trap area is made of plastic. The rotor base with bearing part and nozzles is made of metal. A separation of the rotor parts is only possible after removal of the entire rotor from the centrifuge, because a lying below the rotor base nut must be solved, which holds the upper and lower parts together. An axial withdrawal of the rotor upper part from the top of the rotor is structurally not possible here.

The document DE 484 609 C describes a centrifuge with a drive part and a dirt trap part, which is axially plugged onto the drive part. For this purpose, the drive part has a shaft with a conical upper end, on which the waste collecting part is placed with a diametrically opposed receiving opening.

In particular, a dirt trap part made of plastic is subject to the operation of the centrifuge of the risk of deformation under the influence of centrifugal forces and / or heat. This leads to the previously known rotors that the inner diameter of the waste collecting part is larger. In this way, during operation of the centrifuge, an increasing play arises in the area of the connection between the dirt trapping part and the bearing part, which leads to an increasing unbalance and thus to a loss of performance Centrifuge, resulting in a shortened bearing life and disturbing noises.

For the present invention, therefore, the task of creating rotors and a centrifuge of the type mentioned above, which avoid the disadvantages set out and with which in particular the occurrence of imbalances in operation is avoided and thus ensures high performance with good durability and low noise level becomes.

A first solution of this object is achieved according to the invention by a rotor of the type mentioned above, which is characterized in that the bearing part and the dust collecting part are provided with positive contours, which are arranged so that the contours of the waste collecting part already in its ground state or in its radial expansion by centrifugal forces and / or heating to the correspondingly shaped contours of the bearing part lean or create that the positive contours are formed by annular areas, that the bearing part made of metal or plastic and axially above and axially below each having a concentric to the axis of rotation ring area that the dirt trap part consists of plastic and axially above and axially below each having an annular region, that in the assembled state of the bearing part and the dirt trapping each of the annular region of the bearing part radially surrounds the annular region of the waste trapping part and that the positive co Seen in the radial direction in the inner half of the radius of the bearing part and the waste collecting part are arranged nturen.

In the case of the rotor according to the invention, it is ensured that the bearing part, which can be shaped in a dimensionally stable manner, ensures exact centering and thus unbalance concentricity of the hollow body forming and made of plastic and thus inherently more unstable. The centrifugal force arising during the rotation of the rotor during operation of the centrifuge even ensures that the contours of the dirt-collecting part bear against the respectively associated contours of the bearing part that are stable in their shape and position, so that the dirt-catching part becomes exactly the same due to the rotation of the rotor rotationally symmetric shape inevitably assumes and retains during rotation of the rotor. Thus, the dirt trap part made of plastic can be made relatively easily and with relatively low material thicknesses, without the risk of performance-reducing imbalance occurs, which is advantageous both in the production and operation of the centrifuge. The creation of contours the dirt-collecting part to the contours of the bearing part under the action of centrifugal force during operation of the centrifuge also advantageously reduces micro-movements between the bearing part and the dirt-catching part due to the power flow generated thereby. This counteracts a removal of material and wear in this area by the effect of, for example, externally recorded oscillatory accelerations. Because the form-fitting contours are formed by ring areas, a precisely round shape of the dirt-catching part can be ensured particularly effectively during the rotation of the rotor. The bearing part consists of metal or plastic and has axially above and / or axially below (each) a concentric to the axis of rotation ring area, the dirt trap part is made of plastic and has axially above and / or axially below a ring area and in the assembled state of bearing part and Dirt catching part comprises (in each case) of the annular region of the bearing part, the annular region of the waste collecting part radially outside. Thus, the centering of the less dimensionally stable waste-collecting part is realized by the more stable drive part simple but reliable. The positive contours are arranged in the radial direction in the inner half of the radius of the bearing part and the waste collecting part. As a result of the arrangement of the form-fitting contours, which are located relatively radially inwardly, they are less heavily stressed by centrifugal forces during the rotation of the rotor, which permits relatively small material thicknesses and thus saves weight.

In a further embodiment, the invention provides that the annular region of the bearing part, viewed in its circumferential direction, is designed to extend continuously or as a result of two or more ring sections. Its function of centering the dirt trap part of the ring area in each of the two aforementioned embodiments. Depending on the manner of producing the bearing part, one or the other embodiment may be more advantageous in terms of manufacturing technology.

In an analogous manner, the annular region of the dirt-trapping part can be designed to run continuously as seen in its circumferential direction or as a result of two or more ring sections.

An embodiment of the rotor provides that each annular portion of the waste collecting part at standstill of the rotor has a Ausgangsmaß d its outer diameter, which is smaller than the inner diameter D or equal to the inner diameter D of the annular portion of the bearing part, and that upon rotation of the rotor during operation of the Centrifuge each ring portion of the waste collecting part in its outer diameter by centrifugal force on the diameter D is expandable. In this embodiment, the mounting and dismounting of the rotor is particularly easy because initially there is a mounting clearance according to the Maßdifferenz between the inner diameter D and the initial dimension d of the outer diameter or at least no excess of the outer diameter d relative to the inner diameter D. During operation of the centrifuge then the rotation of the rotor and the centrifugal force generated thereby inevitably ensure that the outer diameter of the dirt trap part increases from its initial dimension d up to the inner diameter D of the annular region of the bearing part, whereby then a circumferential contact of the two annular areas of the dirt trap part and Bearing part is guaranteed to each other. The mutual system ensures a rotationally symmetrical shape of the dirt trap part and a good concentricity without imbalances. When the rotor is at a standstill, the outside diameter of the annular region of the dirt-collecting part can again be reduced to its initial dimension d, as a result of which a smooth disassembly of the dirt-trapping part from the bearing part is also possible.

As an alternative to the above-described embodiment, there is the possibility that each annular region of the waste-collecting part has a starting dimension d of its outer diameter when the rotor is at rest, which is greater than the inner diameter D of the annular region of the bearing part, and that after the axial attachment of the waste-collecting part to the bearing part Ring areas under bias with each other are engaged. In this case, the diameter difference d-D is of course limited to those values at which even a trouble-free mating and separating of bearing part and dirt trap part is possible.

It is further provided that the bearing part at the top has a tubular, open-topped end portion as an annular region and that the dirt-catching member has a central, axially inwardly facing, engaging in the end collar as a ring area. In this embodiment, the collar protrudes into the tubular end portion; Thus, the two cooperating annular areas in the upper part of the rotor are very simple and yet effective, so that in the manufacture of the rotor for the realization of the annular areas no large additional manufacturing and processing costs incurred.

In order to secure the dirt trap part in operation of the centrifuge on the bearing part and to prevent these two parts from undesirable relative movement, it is further provided that the annular portion forming the end portion and the annular region forming collar with cooperating, one for removing the waste trap detachable latching connection are equipped with forming locking means. The latching connection is preferably manually detachable in order to dispense with actuation tools during maintenance in terms of ease of use and a quick removal and installation of the waste tray.

In a further embodiment of the aforementioned latching connection, the collar forming the annular area preferably has two actuating arms projecting upwards beyond the dust-collecting part for a manual release of the latching connection. With these operating arms a simple separation of the waste collecting part from the bearing part is made possible without auxiliary tools, which is advantageous for a quick, time-saving maintenance of the centrifuge.

A modified embodiment provides that the bearing part at the top has an annular, downwardly open attachment as an annular region and that the dirt-collecting part has at the top a central, axially outwardly facing collar engaging in the attachment as the annular region. In this embodiment, the attachment can be advantageously used at the same time to secure the rotor on the axis against unwanted axial movements.

For the purpose of the simplest possible production of the ring area provided at the bottom of the dirt-collecting part, it is preferably provided that the dirt-collecting part is embodied at the bottom in one piece with a central, axially outwardly pointing collar as a ring area. This collar provided at the bottom of the dirt trap part is easy to produce, so that there is no appreciable additional production effort for this purpose either. In addition, this axially outwardly facing collar in the lower part of the dirt catching part can be brought into and out of engagement with an associated annular region of the bearing part by simple axial movement of the dirt catching part relative to the bearing part.

A second solution of the above object is achieved according to the invention by a rotor of the type mentioned, which is characterized in that in addition to the torque transmission means of the bearing part and the dirt trap part are provided with the centering of the dirt trap part form-fitting contours that the positive contours are formed by a plurality of axial projections on the one hand and a plurality of corresponding recesses on the other hand and that the positive contours are arranged so that the contours of the waste tray already in its ground state or at its radial Expansion by centrifugal forces and / or heating to the correspondingly shaped contours of the bearing part lean or create by rotating the rotor, the projections or recesses of the dirt trap under the action of centrifugal the dirt trap part in its shape and relative to the bearing part centering in the radial outward direction put on the recesses or projections of the bearing part.

In the second solution according to the invention provided on the bearing part and the dirt trap part form-fitting contours for the purpose of centering the dirt trap part instead of ring areas now alternatively formed by axial projections on the one hand and corresponding recesses on the other. The projections and recesses may be concentric or eccentric to the axis of rotation of the rotor, as this is irrelevant to the function of the contours here. The axial projections may be associated with the bearing part or the dirt trap part; Also, an assignment of the axial projections partly to the bearing part and partly to the dirt trap part is possible. The corresponding openings are then respectively provided in the other part. Thus, this embodiment has a special design freedom with respect to the position of the projections and recesses, which may be advantageous in some rotor designs.

A manufacturing technology simple and thus favorable shape results when the axial projections are formed by pins and the corresponding recesses through holes.

Furthermore, it is preferably provided that the form-fitting contours formed by axial projections on the one hand and corresponding recesses on the other hand are arranged in the inner half, preferably even in the inner third, of the radius of the bearing part and the dirt trapping part. As a result of this arrangement of the form-fitting contours, which are located radially inward, they are subjected to very little centrifugal forces during the rotation of the rotor, which allows particularly small material thicknesses and thus saves weight.

In a further embodiment of the rotor according to the invention, it is provided that the dirt trapping part comprises drive means for driving the rotor.

A related training proposes that the bearing part has a central tubular body with two radially outwardly extending openings and that the dirt trap part comprises two sealingly connected to the openings, each leading to a recoil nozzle oil passages. In this embodiment of the rotor, the return nozzles are part of the dirt trap part, so that with each renewal of the dirt trap part in the course of maintenance of the centrifuge and new recoil nozzles are installed in the rotor, which is advantageous for reliable operation.

Alternatively, it is proposed that the bearing part comprises drive means for driving the rotor. In this embodiment, therefore, the bearing part is simultaneously the driving part of the rotor.

A related preferred embodiment provides that the bearing part comprises a central tube body forming a lubricating oil channel and two nozzle arms extending radially outward from the tube body, each having an oil passage leading to a respective recoil nozzle, and the positive contours of the bearing part being at least partially against the nozzle arms are trained or worn. In this embodiment of the rotor, the dirt-catching part, which is renewed during the maintenance of the centrifuge, can be produced in a particularly simple manner and thus also particularly cost-effectively, because it does not comprise any drive means. The bearing part, which simultaneously forms the drive part here, can be designed as a high-quality service life component and remain in the centrifuge for a long time. At the same time, the form-fitting contours of the bearing part can be integrated here on both spatially and manufacturing technology favorable way.

In a further embodiment, it is provided that the form-fitting contours of the bearing part are additionally carried on radially extending from the tubular body to the outside supporting arms. These support arms are provided in particular between the nozzle arms, in the circumferential direction of the bearing part at regular intervals and at several points a fixation of the positive contours, for example of the bearing part side Ring area, and so ensure its exact shape and position even over long periods of operation of the rotor.

In order to produce the waste trap part as cost-effectively as possible in large numbers, the invention also proposes that the waste catching part consists of two injection molded parts which are integral with one another and which are tightly interconnected in a plane perpendicular to the axis of rotation of the rotor.

Preferably, it is further provided that the two injection-molded parts of the waste collecting part are welded together. This welding is particularly favorable if the plastic from which the two injection-molded parts of the waste-collecting part are made is a thermoplastic. For example, the plastic polyamide (PA) is suitable.

Another measure for achieving a cost-effective production is that preferably the tubular body with the nozzle arms and the ring support arms is a one-piece die-cast or injection molded part. As a material is here in particular a light metal, such as aluminum or magnesium to use advantageous. Alternatively, it is also possible to use materials which are correspondingly resilient and stable as material for this purpose, e.g. Polyphenylene sulfides (PPS) or thermosets.

The subject of the present invention is furthermore a centrifuge which is characterized in that it has a rotor according to one of the preceding claims. Such a centrifuge is particularly economical, reliable and quiet in operation.

These advantages are particularly advantageous if the centrifuge has a centrifuge for cleaning the lubricating oil of an internal combustion engine, e.g. of a motor vehicle.

Figur 1

eine Zentrifuge mit einem Rotor in einer ersten Ausführung im Längs- schnitt,

Figur 2

den Rotor in einer geänderten Ausführung in perspektivischer, teilwei- se auseinandergezogener Ansicht von Lagerteil und Schmutzfangteil des Rotors,

Figur 3

den unteren Teil des Rotors aus Figur 2 im zusammengebauten Zu- stand im Längsschnitt,

Figur 4

den Rotor aus Figur 2 im zusammengebauten Zustand im Längs- schnitt,

Figur 5

den in Figur 4 unten eingekreisten Bereich V in vergrößerter Darstel- lung,

Figur 6

den in Figur 4 oben eingekreisten Bereich VI in vergrößerter Darstel- lung,

Figur 7

den oberen Bereich des Rotors aus Figur 4 in einer perspektivischen, teils aufgeschnittenen Darstellung,

Figur 8

eine Zentrifuge mit dem Rotor in einer weiteren Ausführung im Längs- schnitt,

Figur 9

einen Ausschnitt aus dem oberen Bereich des Rotors aus Figur 8 in einer vergrößerten Schnittdarstellung,

Figur 10

den unteren Bereich des Lagerteils des Rotors in einer geänderten Ausführung in Ansicht schräg von unten,

Figur 11

das Unterteil des Schmutzfangteils in einer zum Lagerteil gemäß Figur 10 passenden Ausführung in Ansicht schräg von unten,

Figur 12

den unteren Bereich des Lagerteils des Rotors in einer weiteren Aus- führung in Ansicht schräg von unten,

Figur 13

das Unterteil des Schmutzfangteils in einer zum Lagerteil gemäß Figur 12 passenden Ausführung in Ansicht schräg von unten,

Figur 14

den unteren Bereich des Lagerteils des Rotors in einer gegenüber der Ausführung nach Figur 12 leicht abgewandelten Ausführung in Ansicht schräg von unten,

Figur 15

den Lagerteil des Rotors in einer weiteren Ausführung in Ansicht schräg von oben und

Figur 16

das Unterteil des Schmutzfangteils in einer zum Lagerteil gemäß Figur 15 passenden Ausführung in Ansicht schräg von unten.

Embodiments of the centrifuge according to the invention are explained below with reference to a drawing. The figures show:

FIG. 1

a centrifuge with a rotor in a first embodiment in longitudinal section,

FIG. 2

the rotor in a modified embodiment in a perspective, partially exploded view of the bearing part and the dirt-catching part of the rotor,

FIG. 3

the lower part of the rotor FIG. 2 in the assembled state in longitudinal section,

FIG. 4

off the rotor FIG. 2 in the assembled state in longitudinal section,

FIG. 5

the in FIG. 4 circled area V in an enlarged view,

FIG. 6

the in FIG. 4 above circled area VI in an enlarged view,

FIG. 7

the top of the rotor FIG. 4 in a perspective, partly cutaway representation,

FIG. 8

a centrifuge with the rotor in a further embodiment in longitudinal section,

FIG. 9

a cutout from the top of the rotor FIG. 8 in an enlarged sectional view,

FIG. 10

the lower part of the bearing part of the rotor in a modified version in oblique view from below,

FIG. 11

the lower part of the waste collecting part in a storage part according to FIG. 10 suitable execution in view obliquely from below,

FIG. 12

the lower region of the bearing part of the rotor in a further embodiment, viewed obliquely from below,

FIG. 13

the lower part of the waste collecting part in a storage part according to FIG. 12 suitable execution in view obliquely from below,

FIG. 14

the lower portion of the bearing part of the rotor in a respect to the embodiment according to FIG. 12 slightly modified version in view obliquely from below,

FIG. 15

the bearing part of the rotor in a further embodiment in view obliquely from above and

FIG. 16

the lower part of the waste collecting part in a storage part according to FIG. 15 suitable execution in view obliquely from below.

The centrifuge 1 according to FIG. 1 comprises a housing 10, whose upper part is formed by a screw-off cover 14. The housing 10 has for this purpose an internal thread 11 into which an external thread 16 of the cover 14 engages. In the housing 10, a housing part 10 'is used here, which has in its center an axle receptacle 12 with an internal thread. In the axle 12 an axis 5 is screwed by means of a lower threaded end 50. The axis extends upwards and is centered on the inside by means of an upper, separately pressed-in axle end 50 'in the cover 14.

On the axis 5, a rotor 2 is rotatably supported by interposition of a respective lower and upper slide bearing 51, 52.

The rotor 2 consists of a central bearing part 3 and a detachably connected to the bearing part 3 dirt trap part 4. The dirt trap part 4 can be withdrawn with the lid open 14 in the axial direction upwards from the bearing part 3 and replaced by a new dirt trap part 4. In this way, loaded dust collection parts 4 can be replaced regularly and in a simple manner.

The bearing part 3 is a lifetime component of the centrifuge 1 and remains permanently on the axis 5. For reasons of stability, the bearing part here consists of metal.

In particular, for reasons of weight and to achieve low production costs and for the purpose of easy disposal here is the dirt trap part 4 made of plastic. In addition, the dirt trap part 4 here consists of an upper part 41 and a lower part 42, which along a circumferentially continuous weld 40th are tightly welded together. In the embodiment according to FIG. 1 The lower part 42 of the waste collecting part 4 also comprises the drive means for the rotor 2, which are formed here by two oil passages 33 integrated into the lower part 42, each having a recoil nozzle 34 at its radially outer end.

At its axially upper end, the tubular body 30 of the bearing part 3 forms an upper annular region 35 in which an upper annular region 45 of the waste-collecting part 4 engages. The annular region 45 of the waste-collecting part 4 is here formed by an axially downwardly pointing collar whose outer diameter corresponds to the inner diameter of the annular region 35 of the bearing part 3 or is slightly smaller than this.

By not specifically shown in the drawing, known per se means the rotor 2 is secured on the axis 5 against an impermissible displacement in the axial direction upwards.

At its lower end region, the bearing part 3 is designed with a lower annular region 36 in which an axially downward pointing second annular region 46 of the waste collecting part 4 engages radially inward. During rotation of the rotor 2 during operation of the centrifuge 1, the upper annular region 45 and the lower annular region 46 of the waste collecting part 4 lie in radial contact with the upper annular region 35 and the lower annular region 36 of the bearing part 3 as a result of the centrifugal force a dimensionally stable metal, results in this way an exactly centered orientation of the dust collecting part 4 relative to the bearing part 3 and thus also relative to the axis of rotation 20 of the rotor 2, which leads to a good concentricity of the rotor, even if the dirt trap part 4 of a less dimensionally stable Material, in particular plastic, consists.

In order to enable a flow through the rotor 2 with lubricating oil only when the lubricating oil pressure has reached a certain minimum value is in the centrifuge 1 according to FIG. 1 a known per se minimum pressure valve 7 is provided. This minimum pressure valve 7 is arranged in the lower part of the axis 5 and opens or closes according to the respectively applied lubricating oil pressure an inlet 18 which is centrally provided in the housing part 10 'below the lower axis end 50 of the hollow axis 5.

When the lubricating oil pressure is sufficiently high and the minimum pressure valve 7 is opened, lubricating oil flows through the inlet 18 into a central passage 53 penetrating the axis 5 in the longitudinal direction thereof. The lubricating oil flow is then divided into two partial lubricating oil streams. A first partial flow flows through at least one first radial channel 54.1 from the region immediately above the minimum pressure valve 7 in the radial outward direction and further through two radial openings 32 through the bearing part 3 radially from the inside to the outside, finally, in two congruent with the radial openings 32 aligned oil passages 33 which lead to the recoil nozzles 34.

A second portion of lubricating oil flows further upwardly through the central channel 53 in the axis 5 and passes near the upper end of the axis 5 through a second radial channel 54.2 into an annular channel 30 '. This annular channel 30 'is bounded radially inwardly by the outer circumference of the axis 5 and radially outwardly by the inner circumference of the tubular body 30 of the bearing part 3. Immediately below the upper slide bearing 52 at least one running in the radial direction, designed here as a bore oil inlet 44 from the annular gap 30 'in the interior of the waste collecting part 4. The lubricating oil to be cleaned then flows through the waste trap part 4 in the axial direction from top to bottom; In the lower part 42 of the dirt-collecting part 4, an oil outlet 47, which is not completely visible here, is provided radially inwardly, through which the cleaned lubricating oil passes into a pressureless oil-drainage region 13 of the housing 10.

The upper slide bearing 52 is supplied by at least one channel not shown here with lubricating oil, as is well known.

In order to avoid mutual interference between the oil jets emerging from the return nozzles 34 and the partial oil flow emerging from the outlet 47, 10 'are either on the top of the housing part, as in the right half of FIG. 1 represented, deflecting ribs 17 or, as in the left half of FIG. 1 shown, a parallel to the top of the housing part 10 'extending shielding plate 17' is provided.

The FIG. 2 shows a rotor 2 of a centrifuge in a relation to the FIG. 1 modified version, with in FIG. 2 the bearing part 3 and the dirt trap part. 4 are shown during their assembly or separation in an only partially assembled state in a perspective view.

In the lower part of the FIG. 2 the lower portion of the bearing part 3 can be seen. The upper, central region of the bearing part 3 is formed by the tubular body 30, which lies here partly in the waste collecting part 4. Near the lower end go from the tubular body 30 in two opposite radial directions from two nozzle arms 31, which are each equipped with a separately mounted recoil nozzle 34 at its end.

The lower annular region 36 of the bearing part 3 is held on the two nozzle arms 31 as well as on two support arms 36 arranged between the nozzle arms 31. The annular region 36 here has the shape of a circular disk with a radially inwardly facing, circumferential inner peripheral surface.

In the upper part of the FIG. 2 is the dirt trap part 4 of the rotor 2 visible, which is connected by axial plugging with a displacement direction from top to bottom relative to the bearing part 3 with this. During the movement of the waste collecting part 4 in the axial direction down the lower ring portion 46 of the waste collecting part 4 engages with the lower ring portion 36 of the bearing part 3. At the same time enter the nozzle arms 31 in two shape-adapted recesses on the underside of the waste collecting part 4, whereby the two parts and 4 are held against rotation to each other.

In the assembled state, the annular region 46, which is formed here from a total of four sections 46 'adjoining each other at a small distance, abuts against the inner circumferential surface of the annular region 36 of the bearing part 6 and is exactly centered by it in its position. In the process, this centering is even further improved during rotation of the rotor 2 during operation of the centrifuge 1, because the centrifugal forces which occur ensure an exact contact of the outer peripheral surface of the annular region 46 of the waste collecting part 4 on the inner peripheral surface of the annular region 36 of the bearing part 3.

Finally, out of the FIG. 2 It can still be seen that the dirt-collecting part 4 consists of the upper part 41 and the lower part 42, which are connected tightly and permanently to one another along the weld 40.

In FIG. 3 is an enlarged sectional view of the lower portion of the rotor 2 from FIG. 2 in its final assembled state shown in longitudinal section. In the center of the bearing part 3, of which only the lower portion of the tubular body 30 is visible here. Left in FIG. 3 one of the nozzle arms 31 is visible with the extending through this oil passage 33. In the right half of the FIG. 2 the cut does not pass through the second nozzle arm, because the cutting direction is here about the axis of rotation 20 of the rotor 2 (see. FIG. 1 ) is twisted in the circumferential direction.

Radially outside of the tubular body 30, a small part of the lower part 32 of the waste collecting part 4 can be seen. Bottom right in FIG. 3 is radially inside the lower ring portion 46 of the waste collecting part 4 visible; Here, it is visually apparent that the outer circumferential surface of the annular region 46 of the waste collecting part 4 abuts against the inner circumferential surface of the annular region 36 of the bearing part 3.

In addition, the illustrated FIG. 3 in that the nozzle arms 31 lie over part of their length in the lower part 42 of the waste collecting part 4, whereby in a simple manner a rotationally secure positioning of the waste collecting part 4 and the storage part 3 relative to one another in the fully assembled state is achieved. This unwanted relative movements of the bearing part 3 and the dust collecting part 4 relative to each other in the circumferential direction can not occur.

FIG. 4 shows a further rotor 2 in a longitudinal section. Again, the rotor 2 consists of the central bearing part 3 and the associated dirt trap part. 4

The bearing part 3 here also has a central tubular body 30, the upper end of which is provided as the upper annular region 35 and the lower annular region 36 is provided at its lower end region.

The dirt trap part 4 also consists of two parts, namely the cup-shaped upper part 41 and the lower part 42, which are connected to each other along the weld 40. In the center of the upper part 41, an axially inwardly pointing collar is formed as the upper annular region 45 of the waste collecting part 4, which engages in the upper annular region 35 of the bearing part 3 radially inward. In this area is In addition, in this embodiment of the rotor 2, a rolling bearing as the upper bearing 52 disposed in the interior of the tubular body 30. Immediately below the bearing 52, the oil inlet 44 is formed, which serves to introduce the lubricating oil to be cleaned into the interior of the waste collecting part 4.

At the lower part 42 of the waste collecting part 4, an axially downwardly pointing collar is integrally formed as a lower annular region 46. In the assembled state, like him FIG. 4 shows, the lower ring portion 46 of the lower part 42 is radially inward on the inner circumference of the lower ring portion 36 of the bearing part 3 at. In this way, the dirt trap part 4 is exactly centered above and below relative to the bearing part 3. Since the in itself very dimensionally stable bearing part 3 is mounted exactly centered relative to the axis of rotation 20, and the dust collecting part 4 is exactly centered about the axis of rotation 20 of the rotor 2.

FIG. 5 shows in enlarged scale the in FIG. 4 circled lower area V. In the center of FIG. 5 the lower part of the bearing part 3 with the tubular body 30 can be seen. In addition, here one of the radial openings 32 can be seen, which leads into one of the two oil channels 33 which extend through the nozzle arms 31. Down and radially outside in FIG. 5 the ring portion 36 of the bearing part 3 is visible in section.

Radially outward from the bearing part 3 is the lower part of the waste collecting part 4, which has radially inwardly the axially downwardly facing lower annular portion 46 as integrally formed on the lower part 42 collar. Again, it is clear that in the assembled state of the rotor 2, the outer circumference of the lower ring portion 46 of the dust collecting part 4 to the inner periphery of the dimensionally stable lower ring portion 36 of the bearing part 3 applies, whereby the dust collecting part 4 is centered relative to the bearing part 3 and relative to the axis of rotation 20 ,

Here, the annular region 36 has an inner diameter D which is adapted to the outer diameter d of the annular region 46. The outer diameter d of the annular portion 46 may also in its ground state at standstill of the rotor 2 have a dimension that is smaller by a mounting clearance than the inner diameter D; the centrifugal force during rotation of the rotor 2 then causes an expansion of the outer diameter d to the inner diameter D.

It is also in FIG. 5 the course of the outlet 47 can be seen, through which the lubricating oil from the interior of the waste collecting part 4 in the non-pressurized area of the interior of the housing of the centrifuge exceeds.

FIG. 6 shows in enlarged scale the in FIG. 4 circled upper area VI. Also here is in the center of FIG. 6 the bearing part 3, now with the upper portion of its tubular body 30. The upper end of this tubular body 30 forms the upper ring portion 35 of the bearing part. 3

The upper ring region 45 of the upper part 41 of the dirt-collecting part 4 cooperates with the annular region 35, the outer circumference of the annular region 45 also bearing against the inner circumference of the annular region 35. In this case, the system upon rotation of the rotor 2 (see. Fig. 4 ) positively influenced by the occurring, acting on the dust collecting part 4 centrifugal force in terms of their accuracy.

Below the two annular regions 35 and 45, the upper bearing 52 is arranged in the form of a rolling bearing. Under the rolling bearing 52 is the inlet 44 through which the lubricating oil to be cleaned enters the interior of the waste collecting part 4. In the interior of the waste collecting part 4, radially spaced guide walls 48 are provided here in the circumferential direction and are spaced apart radially from the tubular body 30 of the storage part 3.

Finally, at the very top of the center of FIG. 6 still latching means 39, 49 visible, which serve the latching part 4 latching, but manually releasably connected to the bearing part 3. To release the latching connection serve here actuating arms 49 'projecting upwards over the top of the upper part 41 of the waste collecting part 4, wherein in the section in FIG. 6 only one of these actuating arms 49 'can be seen.

FIG. 7 finally shows the upper portion of the rotor 2 according to FIG. 4 in a perspective, partially cut representation. In the lower part of the FIG. 7 the upper portion of the bearing part 3 can be seen, here its tubular body 30 with the inlet 44 for the passage of the lubricating oil into the interior of the waste collecting part 4th

In the upper right area of FIG. 7 is a part of the upper part 41 of the waste collecting part 4 recognizable, wherein the upper part 41 is cut open here to make visible in the interior of the waste collecting part 4 bearing part 3.

The upper end of the tube body 30 is formed with the upper ring portion 35, in which the upper ring portion 45 of the waste collecting part 4 engages. The latching means already mentioned above are specifically formed here by a latching groove 39 formed in the inner circumference of the annular region 35 and by a latching bead 49 matching the latching groove 39 on the outer circumference of the annular region 45 of the dirt catching part 4.

At the top, the two actuating arms 49 'protrude through the upper part 41 of the waste collecting part 4. When pressed inward by an operator in the radial direction, the detent bead 49 comes out of the associated detent groove 39 and the debris portion 4 can be smoothly withdrawn axially upward from the bearing member 3 to exhaust during servicing of the centrifuge , To exchange with dirt particles loaded dust collection part 4 against a fresh dirt trap part 4.

Furthermore, in the in FIG. 7 bearing part 3 provided on this positioning means 6, which here have the form of two axially extending, recessed grooves on the outer circumference of the tubular body 30. Above the diametrically opposite positioning means 6 two mutually running inlet bevels 61 are formed, which serve to position the waste collecting part 4 and the bearing part 3 when they are assembled in the circumferential direction in relation to each other to push them then in the axial direction in the final mounting position. In this final mounting position, the latching means 39, 49 engage and the dust collecting part 4 is then secured in this position on the bearing part 3 both in the axial direction and in the circumferential direction.

FIG. 8 shows an example of a centrifuge 1 in longitudinal section, in which the rotor 2 is composed of a bearing and drive part 3 and a dirt-collecting part 4 connected thereto.

The centrifuge 1 here also comprises a housing 10, which is closed on the upper side with a screw cap 14. The screw cap 14 has an external thread for this purpose 16, which fits into a not shown here internal thread of the housing 10.

Inside the housing 10, here substantially within the lid 14, the rotor 2 is rotatably mounted on the axis 5. The axle 5 is screwed with a lower threaded end 50 in an axle 12, which is centrally mounted in a housing part 10 '. With its upper end 50 ', the axis 5 engages centering in a suitable recess on the inside of the lid 14 a.

On the axis 5 sits by means of two bearings 51 and 52 of the bearing and drive part 3, which here comprises a tubular body 30, extending from the lower end of two nozzle arms 31 opposite to each other radially outward. Through each nozzle arm 31 runs an oil passage 33 which opens at the radially outer end of each nozzle arm 31 in a respective recoil nozzle 34.

The dirt trap part 4 is also in this embodiment in two parts composed of an upper part 41 and a lower part 42, which are sealed together along a weld 40. Inside the dirt trap part 4, as in the left half of FIG. 8 is indicated, spaced apart in the circumferential direction, to be provided in the radial direction guide and partition walls 48, which are embodied here in one piece with the outer peripheral wall of the upper part 41 and the free end radially in the vicinity of the outer periphery of the tubular body 30.

At its central upper region, the upper part 41 has an axially upwardly pointing collar which forms an annular region 45. Radially outwardly, this annular region 45 of the waste-collecting part 4 is surrounded by an annular region 35 of the bearing and drive part 3. The ring portion 35 is formed here as a separate attachment in a ring shape, which is mounted with the interposition of an upper roller bearing 52 on the upper axle end 50 '. Due to the dimensionally stable annular region 35, the annular region 45 of the labileren, made of plastic dust collecting part 4 is centered, with a rotation of the rotor 2, this centering is still improved by the occurring, acting on the annular region 45 centrifugal forces.

In operation of the centrifuge 1 according to FIG. 8 flows through a lower inlet 18 lubricating oil in a central channel 53, the axis 5 in the longitudinal direction passes through and concentric with the axis of rotation 20 of the rotor 2 extends. In the lower region of the channel 53 go from this two radial openings 54.1 outwardly through the axis 5 and open into an annular channel 30 ', which lies between the outer periphery of the axis 5 and the inner circumference of the tubular body 30. A first portion of lubricating oil flows into the two nozzle arms and their oil passages 33 and exits through the nozzles 34. As a result, the rotor 2 is rotated according to the recoil principle in rotation about the axis of rotation 20.

A second portion of lubricating oil flows up through the annular channel 30 'and passes through a throttle point 37 and through at least one inlet 44 into the interior of the waste collecting part 4 near its upper end. This second partial flow of lubricating oil flows through the waste collecting part 4 substantially from top to bottom and then exits through a bottom and radially inner outlet 47 from the waste collecting part 4. The dirt collecting part 4 collects radially outside due to the centrifugal forces occurring in the lubricating oil supplied dirt particles and are thus separated from the lubricating oil.

The lubricating oil emerging from the waste collecting part 4 through the outlet 47 and the lubricating oil emerging from the nozzles 34 unite underneath the rotor 2 in a non-pressurized region 13 of the centrifuge 1 and flow from there, for example into the oil pan of an associated internal combustion engine.

With the cover 14 unscrewed, the upper axle end 50 can be pulled off in the axial direction upward together with the roller bearing 52 provided above and the bearing seat 52 on the outside of the bearing 52, forming the annular region 35. Together with or thereafter, the waste collecting part 4 can also be separated from the storage and drive part 3 by axial withdrawal upwards and replaced by a fresh waste collecting part 4. After placing the upper axle end 50 'with the bearing 52 and the ring portion 35 and after screwing the lid 14, the centrifuge 1 is ready for use again.

FIG. 9 shows an enlarged section of the upper area of FIG. 8 , Right in FIG. 9 is the axis of rotation 20 of the rotor indicated. To the left of this, part of the axle 5 and the upper axle end 50 'placed thereon are visible. On the upper axle end 50 'sits the bearing 52 and radially outward on this turn the essay with the ring portion 35th

In the lower part of the FIG. 9 the upper end region of the tubular body 30 is visible, which protrudes with its upper end into the annular region 45 of the upper part 41 of the waste collecting part 4. Radially inside of the tubular body 30 is the annular channel 31 '. The annular region 45 of the upper part 41 projects radially inward into the annular region 35 and is centered by the latter.

In addition to the execution according to the FIG. 8 is in the execution in FIG. 9 nor provided that the annular regions 35 and 45 are provided with cooperating locking means 39 and 49. These locking means engage with each other when the upper axle end 50 'with the bearing 52 and the annular portion 35 in the axial direction from top to bottom on the upper part 41 and its annular portion 45 is placed. When engaging the centrifuge, the upper axle end 50 is withdrawn with the bearing 52 and the ring portion 35 in the axial direction upwards, this is also the dirt catcher part 4 taken up with, because about the locking means 39 and 49 axial tensile forces can be transmitted.

At the same time, the annular regions 35 and 45 also serve to center the dirt-collecting part 4 during the rotation of the rotor during operation of the centrifuge.

In the embodiments of the rotor 2 described above, the form-fitting cooperating, the centering of the waste tray part 4 serving contours are each formed by annular areas on the bearing part 3 and the dust collecting part 4. In the examples described below, the form-fitting contours on the bearing part 3 and the dirt trapping part 4 by axial projections on the one hand and correspondingly arranged openings on the other hand are formed, with different designs and arrangements are possible.

At the in FIG. 10 shown example, a total of four circular openings or holes 36.1 are provided on the bearing part 3 in the lower region, which may have different diameters, such as FIG. 10 by way of example, and which may also lie at different radii relative to the central axis of the bearing part 3. Here are the openings 36.1 mounted in a form of a circular disk having lower portion of the bearing part 3. Top in FIG. 10 is still a part of the tubular body 30 visible; Left and right in FIG. 10 are the nozzle arms 31, which are not equipped here with the associated nozzles.

FIG. 11 shows in view obliquely from below the lower part 42 of the rest of the dirt trap part, not shown here, which corresponds to the bearing part 3 according to FIG. 10 fits. On the underside are on the lower part 42 according to FIG. 11 a total of four projections 46.1 projecting in the axial direction downward in the form of cylindrical pins, preferably in one piece with the rest of the lower part 42. The position and dimensions of the projections 46.1 are chosen such that they correspond to the apertures 36.1 in the bearing part 3 FIG. 10 fit. It is expedient in the initial state initially sufficient, small movement game available; upon rotation of the rotor, the projections 46.1 apply under the effect of centrifugal force in the radial direction outwardly to the openings 36.1 and are thus fixed in position, whereby unwanted deformations of the lower part 42 and thus of the entire dirt trap part can be avoided.

FIG. 12 shows in the same representation as in FIG. 10 a modified version of the bearing part 3. The modification here is that in the example FIG. 12 now three mutually identical, circular openings 36.1 are arranged in the lower region of the bearing part 3. Here, all openings 36.1 are mounted on a uniform radius and circumferentially evenly spaced from each other.

The FIG. 13 shows that to the bearing part 3 according to FIG. 12 matching lower part 42 of the waste collecting part. At the bottom of the lower part 42 are congruent to the openings 36.1 three axially projecting downwardly projecting projections 46.1 integrally formed in the form of cylindrical pins.

FIG. 14 shows the bearing part 3 in a relation to the FIG. 12 slightly modified form. The modification consists in that in the bearing part 3 according to FIG. 14 the openings 36.1 are not circular, but have in the radial direction outwardly converging bevels, whereby in conjunction with the centrifugal force a centering effect on the openings 36.1 engaging in the projections 46.1 (see FIG. 13 ) is exercised.

In the examples according to the FIGS. 10 to 14 are each the openings 36.1 provided on the side of the bearing part 3 and the corresponding projections 46.1 on the side of the waste collecting part 4. A reverse arrangement is given as an example in the FIGS. 15 and 16 shown.

At the in FIG. 15 in view obliquely visible from above bearing part 3 is above the tubular body 30, from which radiate outwardly in the radial direction, the two nozzle arms 31, which are also not equipped here with their associated nozzles. The lower portion of the bearing part 3 also forms a section in the form of a circular disk, which is designed in one piece with the rest of the bearing part 3. This section is connected in one piece to the tube body 30 both via the nozzle arms 31 and via two support arms 36 'arranged between them. On the form of the annular disc having portion of the bearing part 3 a total of four projections 36.2 are arranged projecting in the form of cylindrical pin upwards, in which case one of these projections 36.2 is behind the tubular body 30 and therefore not visible. The projections 36.2 of the bearing part 3 are arranged on a uniform radius and have circumferentially equal distances, here in each case 90 ° from each other. In addition, here the projections 36.2 are identical to each other in diameter and height.

FIG. 16 shows in view obliquely from below a matching lower part 42 of a waste collecting part. According to the arrangement and the diameter of the projections 36.2 of the bearing part 3 in FIG. 15 are in the lower part according to FIG. 16 four openings 46.2 formed.

In all embodiments according to the FIGS. 10 to 16 Join the projections 46.2 and 36.2 of the lower part 42 and bearing part 3 with the openings 36.1 and 46.1 on the bearing part 3 and lower part 42 in their axial mating engagement. In the assembled state, the contours 46.1 or 46.2 provided on the lower part 42 of the waste catch part are subject to the positionally stable contours 36.1 or 36.2 provided correspondingly on the bearing part 3, with the effect of centrifugal force and / or heat, whereby the lower part 42, independently of the respective design and thus the dirt trap part 4 is centered in its shape and relative to the bearing part 3.

Claims (24)

1. Rotor (2) for a centrifuge (1), wherein said rotor (2) is rotatably driven about a rotation axis (20) and consists of two parts, i.e., a central bearing part (3) and a waste collecting part (4) which is provided with a waste collecting area, the waste collecting part (4) is separable from the bearing part (3) for waste disposal or cleaning, the bearing part (3) and the waste collecting part (4) are provided with torque transmitting means which interact with each other in a form-fitting and/or force-fitting manner and are connectable by axially attaching the waste collecting part (4) on the bearing part (3) and disconnectable by axially removing the waste collecting part (4) from the bearing part (3); characterized in that

   - the bearing part (3) and the waste collecting part (4) are provided with form-fitting contours which are arranged in such a way that the waste collecting part (4) ccontour is placed or rests on the corresponding contour of the bearing part (3) already at the initial state of the waste collecting part (4) or as a result of the radial expansion thereof produced by centrifugal forces and/or by warming;

   - the form-fitting contours are formed by annular areas (35, 36; 45, 46);

   - the bearing part (3) is made of metal or plastic and comprises axially on top and axially on the bottom one annular area (35, 36) each, which is concentric to the rotation axis (20);

   - the waste collecting part (4) is made of plastic and comprises axially on top and axially on the bottom one annular area (45, 46) each;

   - in an assembled condition of bearing part (3) and waste collecting part (4), the annular area (35, 36) of the bearing part (3) each encompasses the annular area (45, 46) of the waste collecting part (4) radially outside; and

   - the form-fitting contours, seen in radial direction, are arranged in the inner half of the radius of bearing part (3) and waste collecting part (4).
2. Rotor according to claim 1, characterized in that the annular area (35, 36) of the bearing part (3) is designed, seen in its circumferential direction, extending continuously or as a sequence of two or more annular sections.
3. Rotor according to claim 1 or 2, characterized in that the annular area (45, 46) of the waste collecting part (4) is designed, seen in its circumferential direction, extending continuously or as a sequence of two or more annular sections (46').
4. Rotor according to any one of the claims 1 to 3, characterized in that each annular area (45, 46) of the waste collecting part (4) comprises, upon the standstill of the rotor (2), an initial dimension d of its outer diameter which is smaller than the inner diameter D or equal to the inner diameter D of the annular area (35, 36) of the bearing part (3), and that upon the rotation of the rotor (2) during operation of the centrifuge (1) each annular area (45, 46) of the waste collecting part (4) is expandable in its outer diameter on the diameter D by the effect of the centrifugal force.
5. Rotor according to any one of the claims 1 to 3, characterized in that each annular area (45, 46) of the waste collecting part (4) comprises, upon the standstill of the rotor (2), an initial dimension d of its outer diameter which is larger than the inner diameter D of the annular area (35, 36) of the bearing part (3), and that after axial attaching of the waste collecting part (4) on the bearing part (3) their annular areas (35, 45; 36, 46) are in connection with each other under pretension.
6. Rotor according to any one of the preceding claims, characterized in that the bearing part (3) on top has a tubular, upwardly open end section as the annular area (35) and that the waste collecting part (4) on top has a central, axially inwardly extending collar engaging into the end section as the annular area (45).
7. Rotor according to claim 6, characterized in that the end section forming the annular area (35) and the collar forming the annular area (45) are equipped with interacting latching means (39, 49) forming a disengageable latching connection for the removal of the waste collecting part (4).
8. Rotor according to claim 7, characterized in that the collar forming the annular area (45) comprises two operating arms (49') protruding upwardly over the waste collecting part (4) for manual disengagement of the latching connection.
9. Rotor according to any one of the claims 1 to 5, characterized in that the bearing part (3) on top comprises an annular, downwardly open crest as an annular area (35) and that the waste collecting part (4) on top comprises a central, axially outwardly extending collar engaging into the crest as an annular area (45).
10. Rotor according to any one of the preceding claims, characterized in that the waste collecting part (4) is designed on the bottom in one-piece with a central, axially outwardly extending collar as an annular area (46).
11. Rotor (2) for a centrifuge (1), wherein said rotor (2) is rotatably driven about a rotation axis (20) and consists of two parts, i.e., a central bearing part (3) and a waste collecting part (4) which is provided with a waste collecting area, the waste collecting part (4) is separable from the bearing part (3) for waste disposal or cleaning, the bearing part (3) and the waste collecting part (4) are provided with torque transmitting means which interact with each other in a form-fitting and/or force-fitting manner and are connectable by axially attaching the waste collecting part (4) on the bearing part (3) and disconnectable by axially removing the waste collecting part (4) from the bearing part (3); characterized in that

    - in addition to the torque transmitting means, the bearing part (3) and the waste collecting part (4) are provided with contours serving to center the waste collecting part (4);

    - the form-fitting contours are formed by a plurality of axial projections (36.2, 46.1) on the one hand and a plurality of corresponding recesses (36.1, 46.2) on the other hand;

    - the form-fitting contours are arranged in such a way that the waste collecting part (4) contours are placed or rest on the corresponding contours of the bearing part (3) already at the initial state of the waste collecting part (4) or as a result of the radial expansion thereof produced by centrifugal forces and/or by warming, this being achieved during rotation of the rotor (2) by the projections (46.1) or recesses (46.2) of the waste collecting part (4) docking in outwardly radial direction against the recesses (36.1) or projections (36.2) of the bearing part (3) under the effect of the centrifugal force, centering the waste collecting part (4) in its form as well as in relation to the bearing part (3).
12. Rotor according to claim 11, characterized in that the axial projections (36.2, 46.1) are formed by pins and the corresponding recesses (36.1, 46.2) by borings.
13. Rotor according to claim 11 or 12, characterized in that the form-fitting contours, seen in radial direction, are arranged in the inner half of the radius of bearing part (3) and waste collecting part (4).
14. Rotor according to any one of the preceding claims, characterized in that the form-fitting contours, seen in radial direction, are arranged in the inner third of the radius of bearing part (3) and waste collecting part (4).
15. Rotor according to any one of the preceding claims, characterized in that the waste collecting part (4) comprises driving means for driving the rotor (2).
16. Rotor according to claim 15, characterized in that the bearing part (3) comprises a central tubular body (30) with two radially outwardly extending openings (32) and the waste collecting part (4) comprises two oil channels (33) connected to the openings (32) in a sealing manner and each leading to a recoil nozzle (34).
17. Rotor according to any one of the claims 1 to 14, characterized in that the bearing part (3) comprises driving means for driving the rotor (2).
18. Rotor according to claim 17, characterized in that the bearing part (3) comprises a central tubular body (30) forming a lubricating oil channel and two nozzle arms (31) extending radially outwardly from the tubular body (30), said nozzle arms (31) each having an oil channel (33) leading to a recoil nozzle (34) each, and that the form-fitting contours of the bearing part (3) are formed or rest on the nozzle arms (31) at least in part.
19. Rotor according to claim 18, characterized in that the form-fitting contours of the bearing part (3) additionally rest on carrying arms (36') extending radially outwardly from the tubular body (30).
20. Rotor according to any one of the preceding claims, characterized in that the waste collecting part (4) consists of two injection molded parts (41, 42) which are each made in one piece and are tightly connected to each other in a plane perpendicular to the rotation axis (20) of the rotor (2).
21. Rotor according to claim 20, characterized in that the two injection molded parts (41, 42) of the waste collecting part (4) are welded to each other.
22. Rotor according to any one of the claims 18 to 21, characterized in that the tubular body (30) with the nozzle arms (31) and the carrying arms (36') is a one-piece die cast part or injection molded part.
23. Centrifuge (1), characterized in that it comprises a rotor (2) according to any one of the preceding claims.
24. Centrifuge according to claim 23, characterized in that it is a centrifuge (1) for cleaning the lubricating oil of an internal combustion engine.

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