EP3222829A1 - Oil separation device, in particular for a crankcase ventilating system of a combustion engine - Google Patents

Abstract

The invention relates to an oil separation device (1), in particular for crankcase ventilation of an internal combustion engine, having a hollow body (11) extending axially in a longitudinal axis (10) and permeable by a gas flow (13) laden with oil (12) in the hollow body (11) provided with an axial passage Ölabscheidekörper (14) is introduced, which is flowed by the gas stream (12). According to the invention, in the region of the passage of the oil separation body (14), a deflection body (15) is introduced into the hollow body (11), which can be flowed by the gas flow (13) substantially from the direction of the longitudinal axis (10) to the gas flow (13) and through the the gas flow (13) can be deflected radially outward against the inside (14a) of the oil separation body (14). The deflection body (15) is arranged in the region of the passage of the oil separation body (14) in operative influence with an intermediate element (27), wherein the intermediate element (27) radial gap (19) through which the gas flow (13) against an inner side of the Ölabscheidekörpers ( 14).

Description

The present invention relates to an oil separation device, in particular for a crankcase ventilation of an internal combustion engine, having a hollow body axially extending in a longitudinal axis, which is flowed through by an oil-laden gas stream, wherein in the hollow body provided with an axial passage oil separation body is introduced by the gas flow can be flowed on.

STATE OF THE ART

In internal combustion engines and piston compressors leakage losses are observed in practice, which are due to an incomplete seal, for example, the piston-cylinder or the valve guides in the cylinder head. Leakage losses are referred to as blow-by gas and contain a significant amount of oil. With reference to internal combustion engines, it is therefore customary to conduct the blowby gas accumulating during operation of the internal combustion engine back into the intake tract of the internal combustion engine. On the one hand to minimize the loss of oil by the blowby gas and on the other hand to ensure optimum combustion and a minimum environmental impact, it is known to supply the blowby gas to an oil separator and to lead the separated oil back into the oil circuit. There is a desire to design appropriate oil separation systems as simple as possible but still reliable and efficient. Another aspect of improving oil separation devices relates to a minimum flow resistance experienced by the gas flow as it flows through the oil separator. However, a high separation efficiency is required to minimize the entry of residual oil into the charge air tract, in particular to prevent oiling of air mass meters and turbochargers.

The DE 10 2009 012 400 A1 shows an oil separator, which is suitable for crankcase ventilation of an internal combustion engine. As a housing, the Ölabscheideeinrichtung a hollow body, which may be formed for example by a portion of a camshaft, or the hollow body is tubular and integrated in a cylinder head cover of an internal combustion engine. In the hollow body, a swirl generator is arranged, and the hollow body has an end-side feed opening for introducing the Gas stream and a discharge opening for discharging the gas stream. The gas stream introduced into the hollow body may carry oil in the form of oil mist or spray droplets which are to be removed from the gas stream by the oil separation device. For this purpose, the cavity further comprises a discharge opening for the discharge of separated oil, which is carried out separately from the discharge of the liberated from the oil gas stream.

The oil separator shown uses a swirl effect, which is particularly advantageous when the oil separator is incorporated in a rotating camshaft, which forms the hollow body of the oil separator. For this purpose, a swirl generator is provided with a plurality of spirally formed flow channels in the hollow body, through which a swirl is introduced into the oil-laden gas stream. Due to the concomitant change in the flow direction of the gas stream entrained oil droplets are deposited in the gas flow to the inner wall of the hollow body, and by the flow of the hollow body in the longitudinal direction, the oil droplets reach the outer region of the Ölabscheideringes, through which the gas flow in the central region of the hollow body of the oil flow in the wall portion of the hollow body is separated. Finally, after the arrangement of the oil separation ring, the oil can be separated by the discharge opening for the oil from the discharge opening of the purified gas stream, which is subsequently fed to the intake tract of the internal combustion engine or, for example, also to a reciprocating compressor. For the formation of the oil separation ring is stated that this may be formed of a porous plastic or of a sintered material, wherein plastic or metal braids are advantageously used. Such braids form a plurality of cavities and labyrinths, whereby the separation of the oil from the gas stream is further supported. The swirl conveys the oil droplets radially outward with respect to the longitudinal axis of the hollow body, and the gas stream is passed through the central passage in the oil separation ring.

As a result of the rotational movement which is introduced into the gas flow by the swirl generator, a considerable flow resistance in the gas flow, as a result of which the separation efficiency is reduced again by lower flow rates through the oil separation device, is produced during the flow through the oil separation device.

DISCLOSURE OF THE INVENTION

The object of the invention is the development of a Ölabscheideeinrichtung especially for the crankcase ventilation of an internal combustion engine, which has a high separation efficiency of oil made possible from a gas stream and which is further developed in particular such that the lowest possible flow resistance of the gas stream is formed by the hollow body.

This object is achieved on the basis of an oil separator according to the preamble of claim 1 in conjunction with the characterizing features. Advantageous developments of the invention are specified in the dependent claims.

The invention includes the technical teaching that in the region of the passage of the Ölabscheidekörpers a deflecting body is introduced into the hollow body, which is flowed by the gas stream substantially from the direction of the longitudinal axis with the gas stream and through which the gas flow radially outward against the inside of the Ölabscheidekörpers is distractible. According to the invention, the deflection body is arranged in the area of the passage of the oil separation body in operative influence with an intermediate element, wherein the intermediate element has radial gaps through which the gas flow reaches an inner side of the oil separation body.
The invention is based on the idea of directing the oil-laden gas stream on the inside against the advantageously tubular or sleeve-shaped oil separation body. The oil from the gas stream can be deposited on the Ölabscheidekörper from the gas stream, and the gas stream can pass through the oil separator body through the example central, axial passage cleaned of the oil, the separated oil between the outside of the Ölabscheidekörpers and the inner wall of the tubular body can be removed , Consequently, the Ölabscheidekörper forms a barrier between the separated oil and the gas stream in the further course of the gas flow, wherein the oil can be removed after passing through the Ölabscheidekörpers from the hollow body and the oil circuit of the internal combustion engine can be fed again. The purified gas stream can be led out of the hollow body and fed to the charge air tract of the internal combustion engine. The radial gaps can already be separated from one another by fan-like lamellae which, in addition to the deflection body, already upstream of the deflection body effect a deflection of the gas flow in the direction of the inside of the oil separation body. The deflection of the gas stream is carried out in principle under application of a radial flow component, which superimposes the axial flow component of the gas stream in the direction of the longitudinal axis of the hollow body. As a result, the intermediate element or the holding body forms a kind of basket, which consists of openings for forming the radial gaps, and the basket-like intermediate element opens into the deflecting body, wherein the deflecting body and the intermediate element can be integrally formed, for example, from a plastic component.

The oil separation body may extend approximately rotationally symmetrically about the longitudinal axis of the hollow body, and the oil separation body may be introduced into the hollow body such that substantially all of the gas flow passes through the passage in the oil separation body. The deflecting body can advantageously be introduced centrally in the passage of the oil separator body, and this can also extend rotationally symmetrically about the longitudinal axis. It is particularly advantageous if the deflecting viewed in the downstream, ie lying in the direction of flow, rear third of the Ölabscheidekörpers, whereby the gas flow is deflected so that it is directed substantially over the entire length of the Ölabscheidekörpers against the inside. In this case, the deflection body may comprise an outer diameter which is determined so that the purified gas stream can flow between the inner diameter of the Ölabscheidekörpers and the outer diameter of the deflecting low pressure loss. The indication of the arrangement or orientation formed downstream, in the sense of the present invention, represents only a directional indication which describes a direction which is oriented in or with a possible gas flow direction.

With particular advantage, the deflecting body and in particular the Ölabscheidekörper be rotationally symmetrical, wherein the deflecting body may have a lying in the longitudinal axis flow tip or deflecting syringe with a preferably downstream hyperbola growing Umlenkkontur. The hyperbolic deflection contour results in a rotational body which forms a circumferential flow throat, so that the deflection of the flow takes place comparatively slowly in order to avoid that the oil entrained in the gas flow is already deposited on the surface of the deflection body. The deflection of the gas flow through the deflection body against the inside of the oil separation body takes place in such a way that the gas flow acts on the inside of the oil separation body approximately vertically in order to achieve a particular impactor effect. Due to the impactor effect, there is a strong subsequent deflection of the gas flow, which can not follow the mass drops of oil, and be absorbed by the oil separator body. The oil in the gas stream can be present in the form of oil mist or drops of oil that can pass through the oil separation body to continue this outside of the Ölabscheidekörpers between the Ölabscheidekörper and the inside of the hollow body downstream of the purified gas stream.

It is of particular advantage that the oil separation body is elongated in the direction of the longitudinal axis. Advantageously, it is conceivable that the oil separation body is funnel-shaped in the direction of the longitudinal axis, wherein the funnel shape is aligned open against the flow direction of the gas stream. This has the effect that the gas flow through the deflection body does not have to be deflected, for example, by 90 °, as would be necessary in order to allow the gas flow to impinge approximately perpendicular to the inside of a hollow cylinder body. By the funnel shape is rather achieved that the deflection of the gas flow, for example, must be done only about 45 ° to 60 ° to impinge already approximately perpendicular to the inside of the funnel-shaped Ölabscheidekörpers and to achieve a corresponding Impaktorwirkung.

With further advantage it can be provided that an inlet funnel is arranged upstream of the passage of the Ölabscheidekörpers upstream, through which the gas stream is accelerated into the passage of the Ölabscheidekörpers inside. The arrangement of the inlet funnel is achieved, in particular, that the gas stream laden with oil does not already impinge against the oil separation body on the front side. The gas stream is pre-accelerated by the inlet funnel in order to have a higher speed even before deflection through the deflecting body and through the radial gaps in the holding body. Subsequently, the gas stream can be further accelerated, since there is a further flow constriction through the radial gaps against the inside of the Ölabscheidekörpers.

In order to advantageously influence the behavior of the gas flow after flowing through the oil separation body, downstream of the oil separation body, an opening funnel may be introduced in the hollow body, which forms a diffuser. The opening funnel is open in the outflow direction, that is, the opening funnel has a larger inner diameter with increasing distance from the Ölabscheidekörpers and can grow up to the inner diameter of the hollow body. The arrangement of the diffuser behind the Ölabscheidekörper can lead to a further reduction of the pressure loss of the gas flow in the opening funnel, whereby the flow resistance of the gas stream is further reduced when flowing through the Ölabscheideeinrichtung. The inlet funnel for accelerating the gas flow can, for example, pass over in one piece into the holding body with the radial gaps, wherein the opening funnel on the side of the oil separation body can adjoin it. In this case, the smallest diameter of the opening funnel can correspond to the smallest diameter of the funnel-shaped oil separator body. The inlet funnel can protrude at least in the transition into the holding body in the funnel-shaped designed Ölabscheidekörper, wherein the deflection in the Region and in particular can be arranged just before the region of the smallest flow cross-section, which is formed by the transition of the Ölabscheidekörpers in the opening funnel.

The Ölabscheidekörper may be at least partially formed of a nonwoven fabric. Other materials for forming the Ölabscheidekörpers may be porous plastics or sintered materials, with material braids of plastic or metal can be advantageously used. In particular, the Ölabscheidekörper can be formed of a material that does not scoffed by the introduction of oil and other particles, in particular impurities, and the oil can pass through the material of the Ölabscheidekörpers, for example, to leave the Ölabscheidekörper on the downstream side.

According to a further advantageous aspect of the present invention, the oil separation body and in particular the nonwoven fabric may have a gas permeability, which is determined such that the gas flow partially flows through the oil separation body. In particular, when the gas flow passing through the oil separation device becomes stronger, both an impactor effect and a filtering effect can be obtained by the oil separation body when at least a part of the gas flow passes through the oil separation body.

It is also conceivable that a first part of the gas flow is deflected by utilizing an impactor on the inside of the Ölabscheidekörpers to finally leave the Ölabscheidekörper through the passage. Another part of the gas stream can pass through the material of the Ölabscheidekörpers, and be continued on the outside of the opening funnel, in particular in the radial gap between the opening funnel and the inside of the hollow body, together with the separated oil. The radial gap formed between the outer side of the opening funnel and the inside of the hollow body thereby allows a guidance of the gas flow in such a way that the oil is separated from the gas flow by the enlarged wall contact in order likewise to achieve a cleaning effect. In particular, after passage of the gas through the Ölabscheidekörper the oil is in droplet shape and can walk along the outside of the opening funnel or on the inside of the hollow body, to be finally fed to a separation opening.

With particular advantage, the hollow body may be formed by at least a portion of a camshaft of an internal combustion engine or the hollow body is formed component-uniformly with a cylinder head cover of an internal combustion engine. In particular, when the hollow body forms a portion of a camshaft, this rotates during operation of the internal combustion engine, so that the deflection of the gas stream is supported radially outward by the rotation of the hollow body. The deflecting body, the holding body, the inlet funnel and the opening funnel and in particular the Ölabscheidekörper can co-rotate with the hollow body, so that a swirl is introduced into the gas stream, which promotes ejection of the oil to the outside. Consequently, the oil is increasingly guided by the flow of the Ölabscheidekörpers against the inside of the Ölabscheidekörpers, so that the deflection of the gas flow through the deflecting with the rotation of the hollow body allows a reinforcing effect for the separation of the oil on Ölabscheidekörper.

Due to the inventive design of the oil separator a very low pressure drop of the gas stream is achieved in flowing through the Ölabscheideeinrichtung. In particular, very narrow flow cross sections are avoided, as they are used in nozzle openings for the flow of an oil separator body. The flow cross sections for the passage of the gas stream are only slightly reduced and the flow contour of the deflecting in the manner of a halved Rotationshyperboloids creates a soft deflection of the gas stream against the inside of the funnel-shaped Ölabscheidekörpers, without resulting in significant pressure losses.
According to a further embodiment, a disk-shaped oil separation ring may be disposed in front of the elongated oil separation body, wherein according to a still further embodiment, the disk-shaped oil separation ring may be preceded by a flow control body having a downstream growing flow contour. Advantageously, the flow guide body extends rotationally symmetrically about the longitudinal axis 10 of the hollow body and is held against the inside of the hollow body via corresponding retaining ribs. It is also conceivable within the scope of the invention that the oil separation ring has a rear-side support ring, against which the oil separation ring is supported. Advantageously, the oil separation ring is formed from a nonwoven fabric and forms a first separation stage. As a result, the oil separation device can identify two, for example, a nonwoven comprehensive oil separation body, which can be flowed through in the flow path of the gas flow in a row. The Ölabscheidering can, as well as the downstream HauptÖlabscheidekörper, acted on a weak gas flow, for example, only superficially so that the gas stream does not completely flow through the nonwoven fabric. The gas stream passes through the Ölabscheidering through a central opening. If the gas flow is stronger, it can flow through the oil separation ring. In both variants, the oil can be separated from the gas flow in such a way that it drains into the hollow body in droplet form on the inside. The impact of the gas stream on the oil separation ring of nonwoven fabric advantageously produces an impactor effect, so that droplets of the oil are already deposited by the impactor effect on the oil separation ring and travel downstream through appropriate recesses between the support ring and the inside of the hollow body on the inside, to then, for example, in To get a separation opening for leading out the oil from the hollow body.

According to a further variant, the deflecting body does not have to be rotationally symmetrical, and this deflecting body can also be elongated in a transverse direction. In particular, the Ölabscheidekörper need not be rotationally symmetrical and this may also have a flat, elongated in a transverse direction extension. The deflecting body may have a transverse flow edge as an alternative to a flow peak. The oil separation body is thus elongated and in particular funnel-shaped in the direction of the longitudinal axis, wherein the funnel shape is designed to be open against the flow direction of the gas flow.

According to yet another variant, the tubular oil separation body can again be made of a non-woven material and seat with a substantially constant outer diameter in a first section of the hollow body, which has a smaller diameter, so that no or only a very little between the Ölabscheidekörper and the inside of the hollow body small radial circumferential gap is present. Thus, the inside of the hollow body forms a baffle surface for a gas stream which migrates through the oil separation body and for oil present in the latter at least in the front region on the flow side.

Downstream, the hollow body can be designed with a second section with a larger diameter or with at least one lateral widening, so that the inside of the hollow body does not bear against the outside of the oil separation body and forms no baffle surface, whereby in this partial area, a flow through the Ölabscheidekörpers with the gas stream can be improved.

The abovementioned variants of the oil separation device are designed such that the gas flow is deflected only radially outward or partially inwards again, without a swirl or a flow component being introduced into the gas flow which would or would lead around the longitudinal axis of the oil separation device , This results in the advantage that the gas flow experiences a smaller pressure drop when flowing through the oil separation device than when introducing a swirl into the gas flow, as known from the prior art. The swirl-free guidance of the gas flow through the oil separation device is based in particular on the design of the deflecting body as a rotational body or as a flat body in a transverse direction, which limits the deflection of the gas flow to radial and axial flow components.

EMBODIMENTS OF THE INVENTION

Fig. 1

ein Ausführungsbeispiel einer Ölabscheideeinrichtung mit den Merkmalen der vorliegenden Erfindung, wobei der Gasstrom beispielhaft als schwach ausgebildeter Gasstrom dargestellt ist,

Fig. 2

das Ausführungsbeispiel gemäß Figur 1, wobei der Gasstrom beispielhaft als stark ausgebildeter Gasstrom dargestellt ist,

Fig. 3

ein weiteres Ausführungsbeispiel einer Ölabscheideeinrichtung, die einen dem Ölabscheidekörper vorgelagerten Ölabscheidering und einen Strömungsleitkörper mit einer stromabwärts anwachsenden Strömungskontur aufweist,

Fig. 4

das Ausführungsbeispiel der Ölabscheideeinrichtung gemäß Fig. 3 in einer fliegenden Ansicht,

Fig. 5

eine Draufsicht auf ein weiteres Ausführungsbeispiel einer Ölabscheideeinrichtung, die nicht rotationssymmetrisch ausgeführt ist und eine in einer Querrichtung ausgebildete längliche Erstreckung aufweist,

Fig. 6

eine teilweise Explosionsdarstellung der Ölabscheideeinrichtung gemäß dem Ausführungsbeispiel aus Fig. 5,

Fig. 7

eine Schnittdarstellung des Ausführungsbeispiels der Ölabscheideeinrichtung gemäß der Schnittlinie A - A, wie in Fig. 5 gezeigt,

Fig. 8

eine Schnittdarstellung des Ausführungsbeispiels der Ölabscheideeinrichtung gemäß der Schnittlinie B - B, wie in Fig. 5 gezeigt und

Fig. 9

ein Ausführungsbeispiel einer Ölabscheideeinrichtung mit einem Umlenkkörper, der an einem Zwischenelement angeordnet ist und wobei der Hohlkörper im Aufnahmeabschnitt des Ölabscheidekörpers eine Aufweitung aufweist.

Embodiments of the invention Ölabscheideeinrichtung be shown in more detail with reference to the figures. It shows:

Fig. 1

An embodiment of an oil separator with the features of the present invention, wherein the gas stream is exemplified as a weakly formed gas stream,

Fig. 2

the embodiment according to FIG. 1 , wherein the gas stream is shown by way of example as a highly developed gas stream,

Fig. 3

a further embodiment of an oil separation device, which has an oil separation ring upstream of the oil separation body and a flow guide body with a downstream increasing flow contour,

Fig. 4

the embodiment of the oil separator according to Fig. 3 in a flying view,

Fig. 5

a top view of another embodiment of a Ölabscheideeinrichtung which is not rotationally symmetrical and has an elongated extent formed in a transverse direction,

Fig. 6

a partial exploded view of the Ölabscheideeinrichtung according to the embodiment of Fig. 5 .

Fig. 7

a sectional view of the embodiment of the Ölabscheideeinrichtung according to the section line A - A, as in Fig. 5 shown,

Fig. 8

a sectional view of the embodiment of the Ölabscheideeinrichtung according to the section line B - B, as in Fig. 5 shown and

Fig. 9

An embodiment of an oil separation device with a deflecting body, which is arranged on an intermediate element and wherein the hollow body has a widening in the receiving portion of the Ölabscheidekörpers.

The FIGS. 1 and 2 show in a respective sectional view of a Ölabscheideeinrichtung 1 with the features of the present invention. The oil separation device 1 has a hollow body 11 which extends along a longitudinal axis 10. The hollow body 11 may be formed for example by a portion of a camshaft which forms the hollow body 11 as a tubular support shaft. According to an alternative embodiment, the hollow body 11 may be integrated in a cylinder head cover of an internal combustion engine. In this case, the hollow body 11 is executed according to the embodiment shown about the longitudinal axis 10 rotationally symmetrical.

On a first side, a gas stream 13 loaded with oil 12 can be introduced into the hollow body 11, and on the side of the gas inlet there is an inlet funnel 20, which reaches up to the inside of the hollow body 11. The gas stream 13 is thus completely introduced into the inlet funnel 20, whereby the gas stream 13 accelerates in the direction of the longitudinal axis 10. Adjoining the inlet funnel 20 is a holding body 18, and downstream of the holding body 18 there is a deflecting body 15 with a flow tip 16 pointing counter to the flow direction of the gas flow 13, which lies in the longitudinal axis 10. The deflecting body 15 extends rotationally symmetrically about the longitudinal axis 10, and the flow peak 16 is adjoined by a Umlenkkontur 17, which has an increasing diameter downstream, the increase in diameter exemplifies a hyperbolic Umlenkkontur 17 forms. The gas stream 13 accelerated through the inlet funnel 20 strikes the deflection body 15 with the deflection contour 17 and is deflected radially outward.

Furthermore, located in the hollow body 11, an oil separation body 14 which is funnel-shaped, and the funnel shape opens opposite to the direction of the gas stream 13. The oil separation body 14 is located along the longitudinal axis 10 in such an axial Position, so that the deflecting body 15 is seated approximately in the rear third in Ölabscheidekörper 14. Upstream adjoins the deflecting body 15 of the holding body 18, which is designed with radial gaps 19. The impinging on the deflecting body 15 gas stream 13 is passed through the radially outward deflection by the Umlenkkontur 17 through the radial column 19 of the holding body 18, and by the radial deflection of the gas stream 13, this strikes the inner side 14 a of the Ölabscheidekörpers 14, the off a nonwoven fabric is formed.

Between the holding body 18 and the inner side 14 a of the Ölabscheidekörpers 14 extends a circumferential radial gap, so that the gas stream 13 can flow around the deflecting body 15, and can flow through the central passage through the oil separator 14 downstream.

An opening funnel 21 connects to the oil separation body 14, which acts as a diffuser and by which the pressure loss is minimized when flowing through the oil separation device 1 with the gas stream 13. After a passage of the gas stream 13 through the holding body 18, after a flow around the deflection body 15 and after hitting the inner side 14a of the Ölabscheidekörpers 14, the gas stream 13 is cleaned in the further course through the opening funnel 21 from the oil 12 so that the purified gas stream 13 'the Air intake tract of the internal combustion engine can be supplied. The separated oil 12 can then be supplied to the oil circuit of the internal combustion engine via not shown separation openings in the hollow body 11 again.

The views of FIGS. 1 and 2 show a separation of the oil 12 through the Ölabscheidekörper 14, such that the oil 12 is discharged in the radial gap between the outside of the opening hopper 21 and the inside of the hollow body 11. In the following, the deposition of the oil 12 from a weaker gas flow 13 in connection with FIG. 1 and the separation of the oil 12 from a more highly developed gas stream 13 in connection with the FIG. 2 described. The oil 12 is shown by way of example in drop form entrained with the gas stream 13, and the oil 12 may similarly be in the form of oil mist or spray oil. In addition to the oil 12 may be present in the gas stream 13 foreign particles in particulate form, which can also be separated by the oil separator 1 from the gas stream 13.

FIG. 1 shows a flow through the oil separator 1 with a weaker and loaded with oil 12 gas stream 13. The gas stream 13 is through the Inlet hopper 20 accelerates and is deflected by the deflecting body 15 such that the gas stream 13 passes through the radial gaps 19 in the holding body 18. Subsequently, the gas flow 13 impinges on the inner side 14 a of the Ölabscheidekörpers 14, whereby an impactor effect is achieved. Due to the impactor effect of the gas stream 13 is greatly deflected, due to the inertia of the oil 12, the oil 12 remains in Ölabscheidekörper 14, passes through the Ölabscheidekörper 14 and the outside of the Ölabscheidekörper 14 is discharged, shown by way of example with oil 12 in the form of drops, which on the outside of the opening hopper 21st runs along. This embodiment thus shows an effect of the oil separation body 14 as an impactor, so that the gas flow 13 substantially completely passes through the central passage of the oil separation body 14 and enters the opening funnel 21.

FIG. 2 shows the Ölabscheideeinrichtung 1 with a stronger gas flow 13, which enters the inlet hopper 20 loaded with oil 12. The gas flow 13 is deflected by the deflecting body 15 through the radial gaps 19 in the holding body 18 against the inner side 14 a of the Ölabscheidekörpers 14, and through the stronger formation of the gas stream 13 undergoes a portion of the gas stream 13 has an impactor effect and is on the inner side 14 a of the Ölabscheidekörpers 14 only deflected, which is accompanied by a deposition of the teardrop-shaped oil 12. Another part of the gas stream 13 flows through the Ölabscheidekörper 14 and exits together with the oil 12 on the outer side 14b of the Ölabscheidekörpers 14 again. The portion of the gas stream 13 flowing through the oil separation body 14 runs downstream between the inner wall of the hollow body 11 and the outer side of the opening funnel 21, whereby a separation of the gas flow 13 'from the oil 12 is also maintained in the outer region of the opening funnel. Subsequently, this purified gas stream 13 'can be recombined outside the opening funnel 21 with the purified gas stream 13' within the opening funnel 21. The oil 12 can be discharged in a manner not shown in detail by separating openings from the hollow body 11 and the oil circuit of the internal combustion engine are fed again. The purified gas stream 13 'can be supplied to the charge air tract of the internal combustion engine.

FIG. 3 shows a further embodiment of a Ölabscheideeinrichtung 1, which is introduced in a hollow body 11. The Ölabscheideeinrichtung 1 has a flow guide 22, which is flown by a gas stream 13 which is loaded with droplets of oil 12. The flow guide 22 extends rotationally symmetrically about the longitudinal axis 10 of the hollow body 11 and is held against the inner side 11 a of the hollow body 11 via corresponding retaining ribs 23, of which a retaining rib 23 is shown on the upper side in section.

Between the outside of the flow guide body 22 and the inner side 11 a of the hollow body 11, a flow cross-sectional area 24 is formed which, regardless of the holding ribs 23, is formed essentially completely around the flow guide body 22. The gas stream 13 is accelerated into the flow cross-sectional area 24 by the flow guide body 22, and the accelerated gas stream 13 then strikes an oil separation ring 25, which is connected upstream of a subsequent further oil separation body 14. The oil separation ring 25 has a rear side support ring 26, against which the oil separation ring 25 is supported, wherein the oil separation ring 25 is formed of a nonwoven fabric and forms a first separation stage.

The impact of the gas stream 13 on the oil separation ring 25 made of nonwoven fabric results in an impactor effect, so that droplets of the oil 12 are already deposited by the impactor effect on the oil separation ring 25. The separated oil 12 can migrate downstream through corresponding recesses between the carrier ring 26 and the inner side 11 a of the hollow body 11 on the inner side 11 a, in order subsequently to pass into a separation opening (not shown) for removing the oil 12 from the hollow body 11.
The deflected by the Impaktorwirkung gas stream 13 'passes through the oil separation ring 14 through an inner passage, wherein the gas stream 13' is already pre-cleaned. The prepurified gas stream 13 then passes via an intermediate element 27 in operative influence with the deflection body 15, and the gas flow 13 'is deflected by the deflection body 15 against the oil separation body 14. The intermediate element 27 has radial gaps 19, through which the gas flow 13 'reaches the inside of the tubular or sleeve-shaped further oil separation body 14. The deflection of the gas flow 13 'radially outwards takes place through the deflecting body 15, which has a deflecting tip 28 on the front side, and the deflecting tip 28 follows an approximately hyperbolic body shape of the deflecting body 15 which extends rotationally symmetrically about the longitudinal axis 10 and which with the intermediate element 27 is formed in one piece.

The reaching against the inside of the Ölabscheidekörpers 14 gas stream 13 'undergoes a further impactor effect, whereby an additional separation effect of droplet-shaped oil 12 is achieved, so that finally the on the right side of the oil separator 1 effluent gas stream 13' is cleaned in a special way.

The further Ölabscheidekörper 14 may also comprise a nonwoven fabric, and the pre-cleaned gas stream 13 may flow only against the inside of the Ölabscheidekörpers 14 or even flow through this even with at least a partial gas flow. The separated oil 12 can then be removed via a Ölabführöffnung not shown.

FIG. 4 shows an exploded view of parts of the oil separator 1 according to the embodiment in FIG. 3 , wherein the hollow body 11 is not shown for clarity. The oil separation device 1 is flown from the arrow direction shown with the gas stream 13 and with this entrained oil 12, so that first the flow guide 22 comes into contact with the gas stream 13 and the droplets of oil 12 shown by way of example. At the flow guide 22, the oil separation ring 25 connects, which is held by a support ring 26 back. In this case, the flow guide 22 can be clipped with simultaneous fixation of the oil separation ring 25 on the support ring 20, to which the holding ribs 23 are formed as snap hooks.

The support ring 26 is exemplified in one piece with the intermediate member 27, and the intermediate member 27 has extending in the flow direction retaining walls 29, through which the further oil separation 14 can be held against the inner wall of the hollow body not shown in detail. Thus, a distance between the radial gaps 19 in the intermediate element 27 and the Ölabscheidekörper 14 is maintained, so that the inside of the Ölabscheidekörpers 14 can be flowed through the gas stream 13.

On the outside of the carrier ring 26 recesses 30 are shown, can be passed through the oil 12, which was already deposited by the first oil separation ring 25 from the gas stream 13, on the outside of the Ölabscheidekörpers 14.

The nonwoven fabric of the oil separation body 14 need not necessarily contact the inner wall of the hollow body 11, but a gap between the outer peripheral surface of the nonwoven fabric and the inner peripheral surface of the hollow body 11 may be given to promote drainage of oil droplets.

FIG. 5 shows a plan view of a further embodiment of an oil separator 1 from the direction of the longitudinal axis 10, wherein the oil separator 1 is not rotationally symmetrical and has a formed in a transverse direction Y elongated and thus flat extent. Visible in the plan view is also flat formed hollow body 11, in which a further embodiment of an intermediate element 27 is inserted, are introduced into the radial column 19, through which the gas flow can flow.

On the inside in the intermediate element 27 of the deflecting body 15 is formed, the no flow peak as in FIG. 3 has, but by the elongate-flat design, the deflecting body 15 has a longitudinal flow edge 31 in the transverse direction Y.

FIG. 6 shows a partial exploded view of the oil separator 1 according to the embodiment FIG. 5 are introduced into the radial gap 19 with the flat formed hollow body 11, the flat trained oil separator 14 and the intermediate member 27 through which the gas flow can pass and the oil separation body 14 can act on from the inside.

FIG. 7 shows a cross-sectional view of the oil separator 1 according to the embodiment FIG. 5 in the section plane A - A and FIG. 8 shows a cross-sectional view of the oil separator 1 according to the embodiment FIG. 5 in the section plane B - B.

The embodiment of the flat oil separator 1 has a structure and a function, as this or this already in connection with the embodiment of FIGS. 1 and 2 described above. On an inlet side of the hollow body 11, a loaded with oil 12 gas stream 13 can be initiated. The gas stream 13 flows into the intermediate element 27, which is seated in the oil separation body 14 and forms on the front side essentially an inlet funnel 20, as in connection with FIGS FIGS. 1 and 2 described above. In the intermediate element 27, a deflecting body 15 is introduced, through which the gas stream 13 is passed through radial gaps 19 on the inside of the oil separator 14. The Ölabscheidekörper 14 is funnel-shaped, and the funnel shape opens against the direction of the gas stream 13 and tapers downstream.

The oil separation body 14 is located along the longitudinal axis 10 in an axial position in front of the deflecting body 15, so that it is behind the Ölabscheidekörper 14 and upstream of the diverting body 15, the gas stream 13 is passed through this through the radial gaps 19 on or through the Ölabscheidekörper 14. The separation of the oil 12 takes place for a weak and for a strong flow of the gas stream 13 as in connection with the FIGS. 1 and 2 already described.

The views of FIG. 7 and FIG. 8 show that the radial deflection of the gas stream 13 loaded with oil 12 takes place even in a non-rotationally symmetric deflecting body 15 in the same manner without swirling as in a rotationally symmetric deflecting body 15, because the gas stream 13 experiences no twist in the flow through the oil separator 1. The flat design of Oil separation device 1 with an extension in a transverse direction Y can for example be adapted to an installation situation of the device. As a result of the impact of the gas flow 13 with the oil 12 on the oil separation body 14, the oil 12 is separated from the gas flow 13 either by an impactor effect upon impact and rebounding or by a filter action with a flow through the oil separation body 14.

FIG. 9 Finally, shows a modified embodiment with a Ölabscheideeinrichtung 1, which is constructed of a separately designed inlet funnel 20, in which the gas stream 12 loaded with oil 12 flows and to which an intermediate element 27 integrally connects. The intermediate element 27 is designed in the manner of a basket and has radial gaps 19 through which the gas flow 13 flows and flows against the oil separation body 14 on the inside. Depending on the flow velocity, the gas stream 13 can then impinge on or pass through only the inner surface of the oil separation body 14 until the gas stream 13 'cleaned by the oil 12 leaves the oil separation device 1 again.

For deflection of the gas flow 13, a deflecting body 15 is internally provided in the intermediate element 27, which is flowed by the gas flow 13 from the direction of the longitudinal axis 10 and by the gas flow 13 is deflected radially outwardly to flow through the radial gaps 19.

The tubular Ölabscheidekörper 14 is made of a non-woven material and is seated with a substantially constant outer diameter in a portion 11 'of the hollow body 11, which has a smaller diameter, so that between the Ölabscheidekörper 14 and the inside of the hollow body 11 no or only a very small radially circumferential gap is present. Thus, the inside of the hollow body 11 forms a baffle surface for a gas flow through the oil separation body 14 13 and for existing in this oil 12th

Downstream of the hollow body 11 is designed with a portion 11 "with a larger diameter or with at least one lateral expansion, so that the inside of the hol body 11 is not applied to the outside of the Ölabscheidekörpers 14 and does not form a baffle, whereby in this part of a flow through the Ölabscheidekörpers 14th can be improved with the gas stream 13.

The invention is not limited in its execution to the above-mentioned preferred embodiment. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use. All of the claims, the description or the drawings resulting features and / or advantages, including structural details or spatial arrangements may be essential to the invention both in itself and in various combinations.

LIST OF REFERENCE NUMBERS

1

oil separator

10

longitudinal axis

11

hollow body

11 '

Small diameter section

11 '

Large diameter section

11a

inside

12

oil

13

gas flow

13 '

purified gas stream

14

Ölabscheidekörper

14a

Inside of the oil separator body

14b

Outside of Ölabscheidekörpers

15

deflecting

16

flow peak

17

deflection contour

18

holding body

19

radial gap

20

inlet funnel

21

opening horn

22

flow guide

23

holding rib

24

Flow area

25

Ölabscheidering

26

support ring

27

intermediate element

28

deflecting tip

29

retaining wall

30

recess

31

flow edge

Y

transversely

Claims (13)

Oil separation device (1), in particular for crankcase ventilation of an internal combustion engine, having a hollow body (11) extending axially in a longitudinal axis (10) and permeable by a gas flow (13) laden with oil (12), wherein in the hollow body (11) an oil separation body (14) provided with an axial passage is introduced, which can be flowed by the gas flow (12),
characterized in that in the region of the passage of the Ölabscheidekörpers (14) a deflecting body (15) is introduced into the hollow body (11) of the gas stream (13) substantially from the direction of the longitudinal axis (10) with the gas stream (13) can be flowed and by which the gas flow (13) can be deflected radially outwards against the inside (14a) of the oil separation body (14), wherein the deflection body (15) is arranged in the region of the passage of the oil separation body (14) in operative influence with an intermediate element (27) wherein the intermediate element (27) has radial gaps (19) through which the gas flow (13) passes against an inner side of the oil separation body (14). Oil separation device (1) according to claim 1, characterized in that the deflecting body (15) and in particular the Ölabscheidekörper (14) are rotationally symmetrical, wherein the deflecting body (15) in the longitudinal axis (10) lying Umlenkspritze (28) with a downstream preferably has a hyperbolic growing deflection contour (17). Oil separator (1) according to claim 1 or 2, characterized in that the Ölabscheidekörper (14) in the direction of the longitudinal axis (10) is elongate. Oil separation device (1) according to any one of the preceding claims, characterized in that the deflecting body (15) with the intermediate element (27) is integrally formed. Oil separator (1) according to any one of the preceding claims, characterized in that the Ölabscheidekörper (14) is at least partially formed of a nonwoven fabric. Oil separation device (1) according to any one of the preceding claims, characterized in that the Ölabscheidekörper (14) and in particular the nonwoven fabric has a gas permeability, which is determined such that the gas flow (13) partially flows through the Ölabscheidekörper (14). Oil separation device (1) according to any one of the preceding claims, characterized in that the hollow body (11) is formed by at least a portion of a camshaft of an internal combustion engine or that the hollow body (11) is formed by component uniformly with a cylinder head cover of an internal combustion engine. Oil separation device (1) according to any one of the preceding claims, characterized in that the elongated oil separation body (14) is preceded by a disc-shaped oil separation ring (25). Oil separation device (1) according to claim 8, characterized in that the disc-shaped oil separation ring (25) is preceded by a flow guide (22) with a downstream increasing flow contour. An oil separator (1) according to any of the preceding claims 8 or 9, characterized in that the oil separation ring (25) has a rear side support ring (26) against which the oil separation ring (25) is supported, the oil separation ring (25) being formed of a nonwoven fabric is and forms a first separation stage. Oil separation device (1) according to one of the preceding claims 8 to 10, characterized in that the flow guide (22) extends rotationally symmetrically about the longitudinal axis (10) of the hollow body 11 and against an inner side (11a) of the hollow body (11) via corresponding retaining ribs (23). is held. Oil separation device (1) according to any one of the preceding claims, characterized in that upstream of the passage of the Ölabscheidekörpers (14) an inlet funnel (20) is arranged through which the gas flow (13) into the passage of the Ölabscheidekörpers (14) can be accelerated. Oil separation device (1) according to any one of the preceding claims, characterized in that the hollow body (11) forms a first portion (11 ') in which this close to the Ölabscheidekörper (14) and with its inner side (11a) on the outside of the Ölabscheidekörpers (14) forms a baffle surface for the gas flow (13) and wherein the hollow body (11) forms a second portion (11 ") in which this forms an enlarged radial distance to the outside of the Ölabscheidekörper (14) with its inside, so that a flow of the oil separation body (14) is substantially unaffected by the gas flow (13) through the hollow body (11).

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