EP1877193A1

EP1877193A1 - Centrifuge rotor

Info

Publication number: EP1877193A1
Application number: EP06753442A
Authority: EP
Inventors: Karl Grosse Wiesmann; Uwe Meinig
Original assignee: Ing Walter Hengst GmbH and Co KG
Current assignee: Ing Walter Hengst GmbH and Co KG
Priority date: 2005-05-02
Filing date: 2006-04-28
Publication date: 2008-01-16
Anticipated expiration: 2026-04-28
Also published as: WO2006117141A1; DE202005007162U1; DE502006008945D1; ATE499155T1; CN101247894B; US8002690B2; EP1877193B1; BRPI0611541A2; US20090272680A1; BRPI0611541B1; CN101247894A

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

Description :

Rotor for a centrifuge

The present invention relates to a rotor for a centrifuge, wherein the rotor is rotatable about an axis of rotation, wherein the rotor is designed in two parts with a central bearing part on the one hand and a dirt collecting portion having a dirt collecting part, the waste collecting part for disposal or cleaning from the bearing part separable is 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. Moreover, the invention relates to a centrifuge.

Centrifuges have been used for various uses for decades and are therefore known in practice in many different designs. A rotor with the features indicated above is described in the older, not previously published German utility model application no. 20 2004 004 215.0 of the applicant. In the rotor described therein, the bearing part comprises one or more recoil nozzles for driving the rotor by means of the nozzle or nozzles exiting Lubricating oil, so that the bearing part here forms a driving part of the rotor.

In all previously known and hitherto used centrifuges centered generally an inner diameter of the rotor on an outer diameter of the axis or an outer diameter of a component located between the 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 trap 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. In particular, a dirt trap part made of plastic is subject during operation of the centrifuge 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 imbalance and thus to a loss of performance of the centrifuge, to a shortened bearing service life and to disturbing noises.

For the present invention, therefore, the object is to provide a rotor 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 so high performance with good durability and low operating noise level is guaranteed. The solution of this object is achieved erfindungsgernäß 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 at its radial Expansion by centrifugal forces and / or heating to the correspondingly shaped contours of the bearing part lean or create.

In the rotor according to the invention it is achieved that the smoothly dimensionally shapable bearing part ensures an exact centering and thus for an unbalance-free concentricity of a hollow body forming and made of plastic and thus inherently unstable dirt catching part. 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 a part through the rotation of the rotor exactly rotationally symmetrical shape inevitably assumes and retains during the 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 power-reducing unbalance occurs, which is advantageous both in the production and in operation of the centrifuge. The application of the contours of 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-trapping part as a result of the force flow generated thereby. This affects a material removal and wear in this Range counteracted by the effect of eg externally registered Schwingbeschieunigungen.

A first embodiment further provides that the form-fitting contours are formed by annular regions. As a result, a precisely round shape of the dirt-collecting part can be ensured during the rotation of the rotor in a particularly effective manner.

It is further proposed that the bearing part made of metal or plastic and axially above and / or axially below (each) has a concentric to the axis of rotation ring portion that the dirt trap part consists of plastic and axially above and / or axially below a ring portion and that in assembled state of the bearing part and the dirt-catching part (respectively) of the annular region of the bearing part comprises the annular region of the dirt-collecting part radially outward.

In a further embodiment, the invention provides that the annular region of the bearing part seen in its circumferential direction is running continuously running 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. In one embodiment of the rotor is provided that the / each ring portion of the SchmutzfangteiIs 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 in the 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 thus generated necessarily ensures that increases the outer diameter of the waste tray from its initial dimension d up to the inner diameter D of the annular portion of the bearing part, thereby creating a circumferential contact of the two ring areas of the waste 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-trapping 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 previously described embodiment, there is the possibility that the / each ring portion of the waste collecting part at standstill of the rotor has a Ausgangsmaß d its outer diameter, which is greater than the inner diameter D of the annular portion of the bearing part, and that after the axial attachment of the waste collecting part the bearing part whose ring portions are biased with each other. Of course, the diameter difference dD is limited to those values at which even a problem-free mating and separating of the bearing part and the waste-collecting part is possible.

It is further provided that the bearing part at the top has a tubular, upwardly open end portion as an annular region and that the waste collecting part at the top has a central, axially inwardly pointing, 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 ring areas no large additional manufacturing and processing costs incurred.

In order to secure the waste collecting 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 collar forming collar with cooperating, one for removing the waste tray 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 region preferably has two protruding upwards over the dirt-collecting part. low-maintenance for a manual release of the locking connection. With these actuating arms, a simple separation of the dirt-collecting part from the bearing part without auxiliary tools is made possible, which is advantageous for fast, 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 at the top has a central, axially outwardly facing collar engaging in the attachment as an 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.

The form-fitting contours provided on the bearing part and on the dirt trapping part may alternatively be formed by annular regions, on the one hand, and by axial recesses, on the one hand, and corresponding recesses, on the other hand. 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 assigned to the bearing part or the dirt trap part, - An assignment of the axial projections partly to the bearing part and partly to the dust collecting 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 production-technically simple and therefore favorable form results when the axial projections are replaced by fen and the corresponding recesses are formed by holes.

Further, it is preferably provided that the positive contours seen in the radial direction are arranged in the inner half, preferably in the inner third of the radius of the bearing part and the waste collecting part. As a result of this arrangement of the form-fitting contours, which are located relatively radially inward, 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 of the rotor according to the invention it is provided that the dirt trapping part comprises drive means for driving the rotor.

A related development proposes that the bearing part has a central tubular body with two radially outwardly extending openings and that the dirt trap part comprises two connected to the perforations, leading to a respective Rückstoßdüse Ölka- channels. 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 has a central, a lubricating oil channel forming tubular body and two radially extending from the tubular body to the outside nozzle arms each having a leading to a respective recoil nozzle oil passage and that the positive contours of the bearing part are at least partially formed or supported on the nozzle arms. 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 therefore 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 also supported on radially extending from the tubular body to the outside supporting arms. These support arms are provided in particular between the nozzle arms, in order to fix in the circumferential direction of the bearing part at regular intervals and at several points a fixation of the positive contours, e.g. of the bearing part-side annular region, and thus to ensure its exact shape and position even over long periods of operation of the rotor.

Furthermore, it is provided that the dirt-collecting part is embodied at the bottom in one piece with a central, axially outwardly pointing collar as an annular region. Also, this provided below the dirt trap collar can be easily made, so that no significant additional production costs incurred for this purpose. In addition, this axially outwardly pointing collar in the lower part of the waste collecting part can be replaced by simple axial loading. Move the dirt trap part relative to the bearing part in and out of engagement with an associated ring portion of the bearing part.

In order to produce the dirt trap part as cost-effective as possible in large numbers, the invention also proposes that the dirt trap part consists of two one-piece injection molded parts, which are connected tightly 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 to achieve 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 comprises a rotor according to one of the preceding claims. Such a centrifuge is particularly economical, reliable and quiet in operation. These advantages are especially effective if the centrifuge is a centrifuge for cleaning the lubricating oil of an internal combustion engine, for example of a motor vehicle.

In the following embodiments of the centrifuge according to the invention will be explained with reference to a drawing. The figures show:

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

FIG. 2 shows 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 shows the lower part of the rotor from FIG. 2 in the assembled state in longitudinal section;

FIG. 4 shows the rotor from FIG. 2 in the assembled state in longitudinal section,

FIG. 5 shows the area V circled in FIG. 4, on an enlarged scale,

FIG. 6 is an enlarged view of the region VI circled in FIG. 4,

FIG. 7 shows the upper region of the rotor from FIG. 4 in a perspective, partially cutaway view,

8 shows a centrifuge with the rotor in a further embodiment in longitudinal section, FIG. 9 shows a section from the upper region of the rotor from FIG. 8 in an enlarged sectional view,

FIG. 10 shows the lower region of the bearing part of the rotor in an altered embodiment in a view obliquely from below,

11 shows the lower part of the waste collecting part in a manner suitable for the bearing part according to FIG. 10, viewed obliquely from below, FIG.

12 shows the lower region of the bearing part of the rotor in a further embodiment in a view obliquely from below, FIG.

FIG. 13 shows the lower part of the dirt-trapping part in a design matching the bearing part according to FIG. 12 in a view obliquely from below,

14 shows the lower region of the bearing part of the rotor in a comparison with the embodiment of Figure 12 slightly modified embodiment in an oblique view from below,

Figure 15 shows the bearing part of the rotor in a further embodiment in a view obliquely from above and

16 shows the lower part of the dirt trap part in a manner suitable for the bearing part according to FIG 15 embodiment in view obliquely from below.

The centrifuge 1 according to FIG. 1 comprises a housing 10, the upper part of which is formed by a screw-off cover 14 is formed. 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 are welded together along a circumferentially continuous weld seam 40 together. In the embodiment shown in Figure 1, the lower part 42 of the waste collecting part 4 and the drive means for the rotor 2, which here by two integrated into the lower part 42 oil passages 33 are each formed with 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 release flow of the rotor z with lubricating oil only when the lubricating oil pressure has reached a certain minimum value, a per se known minimum pressure valve 7 is provided in the centrifuge 1 according to FIG. This minimum pressure valve 7 is arranged in the lower part of the axis 5 and opens or closes according to the respective adjacent oil pressure an inlet 18 which is centrally provided in the housing part 10 'below the lower axis end 50 of the hollow shaft 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 channel 53 which passes through 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 is at least one extending 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-collecting part 4 in the axial direction from top to bottom; in the lower part 42 of the waste collecting part 4, a not completely visible oil outlet 47 is provided radially inwardly, passes through the cleaned lubricating oil in a non-pressurized oil discharge 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 oil partial stream exiting from the outlet 47, deflecting ribs 17 or, as shown in FIG. 1, either on the upper side of the housing part 10 ', as shown in the right half of FIG left half of Figure 1, a parallel to the top of the housing part 10 'extending shielding plate 17' is provided.

FIG. 2 shows a rotor 2 of a centrifuge in a modified embodiment with respect to FIG. 1, wherein in FIG. 2 the bearing part 3 and the dirt trapping part 4 are shown in a perspective view only partially assembled during their assembly or separation.

In the lower part of Figure 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 circumferential surface.

In the upper part of Figure 2, the dirt trap part 4 of the rotor 2 is 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 form-fitting 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 improved upon rotation of the rotor 2 during operation of the centrifuge 1, because the centrifugal forces which occur ensure accurate 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, it can still be seen from FIG. 2 that the dirt trap part 4 consists of the upper part 41 and the lower part 18

42 is made, which are tightly and permanently connected to each other along the weld 40.

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

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

In addition, Figure 3 illustrates that the nozzle arms 31 are located over part of their length in the lower part 42 of the waste collecting part 4, which in a simple manner a rotationally secure positioning of the dust collecting part 4 and bearing part 3 is achieved relative to each other in the fully mated condition. 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. - P2006 / 003962

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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 also has here a central tubular body 30, the upper end of which is designed as an upper annular region 35 and at the lower end region of which the lower annular region 36 is provided.

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, moreover, in this embodiment of the rotor 2, a rolling bearing is disposed as the upper bearing 52 inside the tube body 30. Immediately below the bearing 52 of the 01- inlet 44 is formed, which serves to introduce the lubricating oil to be cleaned in 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, as shown in FIG. 4, the lower annular region 46 of the lower part 42 lies radially inward on the inner circumference of the lower annular region 36 of the bearing part 3. 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. __

20

Figure 5 shows an enlarged view of the circled in Figure 4 lower region V. In the center of Figure 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. Below and radially outside in Figure 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.

In addition, in Figure 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. 62

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Figure 6 shows an enlarged view of the circled in Figure 4 upper area VI. Again, in the center of Figure 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. During the rotation of the rotor 2 (see FIG. 4), the system is positively influenced by the occurring centrifugal force acting on the dust-collecting part 4 with regard to its accuracy.

Below the two annular regions 35- and 45, the upper bearing 52 is arranged in the form of a rolling bearing. Below 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 bearing part 3.

Finally, at the very top in the center of Figure 6 still locking means 39, 49 are visible, which serve to the dust catching part 4 latching, but manually releasably connected to the bearing part 3. For releasing 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 Figure 6, only one of these actuating arms 49' can be seen.

Finally, FIG. 7 shows the upper region of the rotor 2 according to FIG. 4 in a perspective, partially cut representation. In the lower part of Figure 7, the upper portion of the Lagerteiis 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 Figure 7, a part of the upper part 41 of the waste collecting part 4 can be seen, wherein the upper part 41 is cut here to make visible the lying inside 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 trapping member 4 can be smoothly withdrawn axially upward from the bearing member 3 to assist in servicing the centrifuge to replace a depleted, with dirt particles loaded dust collecting part 4 against a fresh dirt trap part 4.

Furthermore, in the bearing part 3 shown in Figure 7 are provided on this positioning means 6, which here have the shape of two axially extending, recessed grooves on the outer circumference of the tubular body 30. Above 62

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The mutually diametrically opposite positioning means 6 are formed two converging inlet slopes 61, which serve to position the waste collecting part 4 and the bearing part 3 in their circumferential direction in the correct position relative to each other when they are assembled, in order then to push them in the axial direction into the final assembly 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 for this purpose an external thread 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 channel 33, which 03962

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dial outer end of each nozzle arm 31 in each case a recoil nozzle 34 opens.

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. As indicated in the left half of FIG. 8, in the interior of the waste collecting part 4, in the circumferential direction spaced apart, radially extending guide and partition walls 48 may be provided, which are embodied integrally with the outer peripheral wall of the upper part 41 and radially free end radially in the vicinity of the outer circumference 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.

During operation of the centrifuge 1 according to FIG. 8, lubricating oil flows through a lower inlet 18 into a central channel 53 which passes through the axis 5 in its longitudinal direction and runs concentrically with the axis of rotation 20 of the rotor 2. In the lower part of the channel 53 go from this two radial openings 54.1 to the outside through the axis 5 and open into an annular channel 30 ', which lies between the outer periphery of the axis 5 and the inner periphery of the tubular body 30. A first lubricating oil partial flow flows into the two nozzle arms and their oil channels 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 through the annular channel 30 'upwards and passes through a throttle point 37 and through at least one inlet 44 into the interior of the waste collecting part 4 near the 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 exiting 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 bearing and drive part 3 by axial withdrawal upwards and replaced by a fresh waste collecting part 4. After setting up the 62

26

Ren axle end 50 'with the bearing 52 and the ring portion 35 and after screwing the cover 14, the centrifuge 1 is ready for use again.

FIG. 9 shows an enlarged detail from the upper region of FIG. 8. On the right in FIG. 9, the axis of rotation 20 of the rotor is 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 Figure 9, the upper end portion of the tubular body 30 is visible, which protrudes with its upper end in 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 embodiment according to FIG. 8, it is also provided in the embodiment in FIG. 9 that the annular regions 35 and 45 are equipped 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.

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

Figure 11 shows a view obliquely from below the lower part 42 of the otherwise not shown here dirt catching part, which fits to the bearing part 3 of FIG 10. On the underside, on the lower part 42 according to FIG. 11, a total of four projections 46.1 projecting downwards in the axial direction are formed in the form of cylindrical pins, preferably The position and the dimensions of the projections 46.1 are chosen so that they fit to the openings 36.1 in the bearing part 3 according to FIG 10. 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 embodiment of the bearing part 3. The modification here is that, in the example according to FIG. 12, three mutually identical, circular apertures 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.

FIG. 13 shows the lower part 42 of the waste collecting part, which fits to the bearing part 3 according to FIG. On the lower side of the lower part 42, three protrusions 46.1 projecting downwards in the axial direction are integrally formed integrally in the form of cylindrical pins in the same way as the perforations 36.1.

FIG. 14 shows the bearing part 3 in a slightly modified form compared to FIG. The modification consists in that, in the bearing part 3 according to FIG. 14, the openings 36. 1 are not circular, but instead have bevels running radially outward, whereby in conjunction with the centrifugal force a centering Effect on the engaging in the openings 36.1 projections 46.1 (see Figure 13) is exercised.

In the examples according to FIGS. 10 to 14, the perforations 36. 1 on the side of the bearing part 3 and the corresponding protrusions 46. 1 on the side of the dirt-collecting part 4 are provided in each case. A reverse arrangement is shown as an example in Figures 15 and 16.

In the bearing part 3 seen obliquely from above in FIG. 15, its tubular body 30 is located at the top, from which the two nozzle arms 31 extend radially outwards, which are likewise not yet equipped 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 in the circumferential direction 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.

Figure 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 Parts 3 in Figure 15 four openings 46.2 are formed in the lower part of FIG 16.

In all embodiments according to FIGS. 10 to 16, the projections 46.2 or 36.2 of the lower part 42 or bearing part 3 engage with the openings 36.1 or 46.1 on the bearing part 3 or lower part 42 when they are plugged axially together. In the assembled state, the contours 46.1 or 46.2 provided on the lower part 42 of the dirt trap part are subject to the positionally stable contours 36.1 or 36.2 provided correspondingly on the bearing part 3, with the influence of centrifugal force and / or heat, whereby, regardless of the respective design, the lower part 42 and thus the dirt trap part 4 is centered in its shape and relative to the bearing part 3.

Claims

Claims:

1. Rotor (2) for a centrifuge (1), wherein the rotor

(2) is rotatably drivable about a rotational axis (20), wherein the rotor (2) is designed in two parts with a central bearing part (3) and on the other hand a dirt collecting portion having a dirt collecting portion (4), wherein the waste collecting part (4) for disposal or cleaning from the bearing part (3) is separable and wherein the bearing part (3) and the dirt-catching part (4) are designed with positively and / or non-positively cooperating torque transmission means, by axially plugging the dirt trap part (4) on the bearing part

(3) in engagement and by axial removal of the waste collecting part (4) from the bearing part (3) are disengageable, characterized in that the bearing part (3) and the waste collecting part (4) are provided with positive contours, which are arranged so that the contours of the waste collecting part (4) already in the ground state or at its radial expansion by centrifugal forces and / or heating to the correspondingly shaped contours of the bearing part (3) lean or create.

2. Rotor according to claim 1, characterized in that the positive contours by annular regions (35, 36, 45, 46) are formed.

3. Rotor according to claim 2, characterized in that the bearing part (3) consists of metal or plastic and axially above and / or axially below (one) to the axis of rotation (20) concentric annular region (35, 36), that the dirt trap part (4) consists of plastic and axially above (/) at the bottom (each) an annular region (45, 46) and that in the assembled state of the bearing part (3) and dirt trap part (4) (respectively) of the annular region (35, 36) of the bearing part (3) comprises the annular region (45, 46) of the dirt catching part (4) radially outward.

4. Rotor according to claim 2 or 3, characterized in that the annular region (35, 36) of the bearing part (3) seen in its circumferential direction running continuously or as a result of two or more ring sections is executed.

5. Rotor according to one of claims 2 to 4, characterized in that the annular region (45, 46) of the waste collecting part (4) seen in its circumferential direction running continuously or as a result of two or more ring sections (46 ') is executed.

6. Rotor according to one of the preceding claims, characterized in that the / each annular region (45, 46) of the waste collecting part (4) at standstill of the rotor (2) has a Ausgangsmaß d its outer diameter, which is smaller than the inner diameter D or equal to Inner diameter D of the ring area

(35, 36) of the bearing part (3), and that upon rotation of the rotor (2) during operation of the centrifuge (1) the / each annular portion (45, 46) of the waste collecting part

(4) in its outer diameter by centrifugal force on the diameter D is expandable.

7. Rotor according to one of claims 1 to 5, characterized in that the / each annular region (45, 46) of the waste collecting part (4) at standstill of the rotor (2) has a Ausgangsmaß d its outer diameter, which is greater than the inner diameter D of Ring portion (35, 36) of the bearing part (3), and in that after the axial attachment of the waste collecting part (4) on the bearing part (3) whose annular regions (35, 45, 36, 46) are biased with each other.

8. Rotor according to one of claims 2 to 7, characterized in that the bearing part (3) above a tubular, upwardly open end portion as an annular region (35) and that the dirt collecting part (4) above a central, axially inward having facing, engaging in the end collar as ring portion (45).

9. Rotor according to claim 8, characterized in that the annular portion (35) forming the end portion and the annular region (45) forming collar with cooperating, one for removing the waste collecting part

(4) releasable latching connection forming locking means (39, 49) are equipped. , ^•

10. Rotor according to claim 9, characterized in that the annular region (45) forming the collar has two upwards over the dirt trap part (4) projecting actuating arms (49 ') for a manual release of the latching connection.

11. Rotor according to one of claims 2 to 7, characterized in that the bearing part (3) above a ring 006/003962

34

has shaped, downwardly open essay as an annular region (35) and that the Schmutzfangteii (4) above a central, axially outwardly facing, engaging in the collar collar as an annular region (45).

12. Rotor according to claim 1, characterized in that the positive contours by axial projections

(36.2, 46.2) on the one hand and corresponding recesses (36.1, 46.1) on the other hand are formed.

13. Rotor according to claim 12, characterized in that the axial projections (36.2, 46.2) by pins and the corresponding recesses (36.1, 46.1) are formed by bores.

14. Rotor according to one of the preceding claims, characterized in that the positive contours seen in the radial direction in the inner half, preferably in the inner third of the radius of the bearing part (3) and the dust collecting part (4) are arranged.

15. Rotor according to one of the preceding claims, characterized in that the dirt collecting part (4) comprises drive means for driving the rotor (2).

16. Rotor according to claim 15, characterized in that the bearing part (3) has a central tubular body (30) with two radially outwardly extending openings (32) and that the waste collecting part (4) has two sealingly connected to the openings (32), to each of a recoil nozzle (34) leading oil passages (33).

17. Rotor according to one of claims 1 to 14, characterized in that the Lagerteii (3) comprises drive means for driving the rotor (2).

18. Rotor according to claim 17, characterized in that the bearing part (3) has a central, a lubricating oil channel forming tubular body (30) and two from the tubular body (30) radially outwardly extending nozzle arms (31), each with one to a respective recoil nozzle (30). 34) leading oil channel (33) and that the positive contours of the bearing part (3) are at least partially formed or carried on the nozzle arms (31).

19. A rotor according to claim 18, characterized in that the positive contours of the bearing part (3) in addition to radially from the tubular body (30) outwardly extending support arms (36 ') are supported.

20. Rotor according to one of the preceding claims, characterized in that the dirt-collecting part (4) is designed at the bottom in one piece with a central, axially outwardly facing collar as an annular region (46).

21. Rotor according to one of the preceding claims, characterized in that the dirt collecting part (4) consists of two respectively one-piece injection-molded parts (41, 42) which in a direction perpendicular to the axis of rotation

(20) of the rotor (2) lying plane are tightly interconnected.

22. Rotor according to claim 21, characterized in that the two injection-molded parts (41, 42) of the waste collecting part (4) are welded together.

23. Rotor according to one of claims 17 to 21, characterized in that the tubular body (30) with the nozzle arms (31) and the support arms (36 ') is a one-piece die-cast or injection molded part.

24. Centrifuge (1), characterized in that it comprises a rotor (2) according to one of the preceding claims.

25. Centrifuge according to claim 24, characterized in that it is a centrifuge for cleaning the lubricating oil of an internal combustion engine.